Semi-dry ardealite brick hydration regulation and control equipment and regulation and control method thereof

Abstract

The invention relates to the technical field of building ardealite powder hydration regulation and control, and discloses semi-dry ardealite brickwork hydration regulation and control equipment which comprises a hydration stirring mechanism configured to be a hydration space with heat preservation and pressure preservation, and the hydration space is internally provided with a planet multi-group stirring piece with a multi-path high-speed timing stirring function. Building phosphogypsum powder, dihydrate phosphogypsum powder, a hydration regulation and control auxiliary agent and water are intermittently doped into the hydration space synchronously and asynchronously; the dry material metering mechanism is configured to be used for metering and weighing the building phosphogypsum powder and the dihydrate phosphogypsum powder; the liquid material metering mechanism is configured to be used for metering and weighing the water and the hydration regulation and control auxiliary agent; the regulation and control method comprises the following steps: step 1, regulating and metering dry materials; 2, regulating and metering a liquid material; 3, initial hydration regulation and control; step 4, hydrating characteristic regulation and control; and step 5, stirring speed control regulation and control. According to the method, the beta-semi-hydrated phosphogypsum is subjected to accurate hydration regulation and control treatment in the batching process, so that the thorough hydration reaction of the beta-semi-hydrated phosphogypsum can be ensured.

Description

Technical Field

[0001] The invention relates to the technical field of hydration control of building phosphogypsum powder, and in particular to semi-dry phosphogypsum bricklaying hydration control equipment and a control method thereof. Background Art

[0002] Phosphogypsum brickwork is a new type of lightweight wall material with the advantages of environmental protection and energy saving, high strength, earthquake resistance, heat preservation, sound insulation, fire resistance, moisture resistance and easy use and installation. It is particularly suitable for high-rise and large-span new urban and rural houses as interior wall partition materials. It is a new type of wall material that has been vigorously developed and promoted in the field of national housing and urban and rural construction for many years.

[0003] The new lightweight wall material of phosphogypsum brick is usually produced by mechanized casting and molding (usually referred to as "wet production"). In the mechanized casting and molding production process, in order to stir evenly and facilitate casting and molding, the amount of water added is usually more than 70% of the amount of modified building phosphogypsum powder. Therefore, after demoulding, the moisture content of the phosphogypsum brick also reaches about 70%. At this time, it is necessary to dry the building phosphogypsum powder by drying or drying. At this time, about 50% of the water will be consumed to obtain phosphogypsum brick products with performance indicators that meet relevant standards. Therefore, energy consumption and production costs will be increased. In addition, in the mechanized casting and demoulding process, after the stirred building phosphogypsum powder slurry is poured into the mold cavity, it needs to be left to stand in the mold cavity for hydration until it is initially set to form a certain strength before it can be lifted and demoulded. Therefore, the production of phosphogypsum bricks produced by mechanized casting and molding takes a long time, and the production efficiency and output are low.

[0004] In addition, in the production process of phosphogypsum bricks, the building phosphogypsum powder will form β-hemihydrate phosphogypsum after hydration. The hydration product of β-hemihydrate phosphogypsum is a cubic crystal structure, which has insufficient structural tightness and poor stability. As a result, when β-hemihydrate phosphogypsum is used as a raw material to prepare phosphogypsum bricks, there are still the following defects:

[0005] ① When β-hemihydrate phosphogypsum is used to prepare phosphogypsum bricks, the hydration reaction of β-hemihydrate phosphogypsum is not complete, which means that after the preparation of the phosphogypsum bricks, water needs to be added to the phosphogypsum bricks to make them absorb water and hydrate again. The amount of water at this time cannot be well controlled. Therefore, in order to make the phosphogypsum bricks take shape, a long time of curing is required, resulting in low overall production efficiency and output. In addition, since β-hemihydrate phosphogypsum is prone to incomplete hydration reaction, the phosphogypsum bricks produced in a relatively humid environment are prone to absorb moisture in the environment, resulting in a significant decrease in the strength of the phosphogypsum bricks, and the strength at the time of leaving the factory is often lower than 5MPa.

[0006] ② When using β-hemihydrate phosphogypsum to prepare phosphogypsum bricks, in order to ensure the thoroughness of the hydration reaction, it is usually necessary to add more than 70% of water so that the β-hemihydrate phosphogypsum can fully absorb water and hydrate. At the same time, in order to improve the strength of phosphogypsum bricks, a modifier is added during the hydration process of the β-hemihydrate phosphogypsum to modify the β-hemihydrate phosphogypsum and improve the crystal structure of the β-hemihydrate phosphogypsum, so that the structure of the β-hemihydrate phosphogypsum is more compact and the stability is improved, thereby achieving the purpose of enhancing the strength of the β-hemihydrate phosphogypsum used to prepare phosphogypsum bricks;

[0007] However, with the use of modifiers for modification, not only does the utilization rate and filling rate of β-hemihydrate phosphogypsum drop significantly, but a large amount of modifiers needs to be added, resulting in a significant increase in the cost of preparing β-hemihydrate phosphogypsum into phosphogypsum bricks.

[0008] Therefore, how to use mechanical force to accurately control the hydration of β-hemihydrate phosphogypsum during the batching process, so as to achieve the goal of reducing water while ensuring the thorough hydration reaction of β-hemihydrate phosphogypsum and adjusting the viscosity of β-hemihydrate phosphogypsum, has become a technical problem that technicians in this field urgently need to overcome. Summary of the invention

[0009] The present invention aims to provide a semi-dry phosphogypsum bricklaying hydration control device and a control method thereof, which can accurately control the hydration of β-hemihydrate phosphogypsum during the batching process, thereby achieving the goal of reducing water while ensuring that the hydration reaction of the β-hemihydrate phosphogypsum is thorough, and at the same time, adjusting the viscosity of the β-hemihydrate phosphogypsum.

[0010] In order to achieve the above object, the present invention adopts the following technical scheme:

[0011] 1) Semi-dry phosphogypsum bricklaying hydration control equipment, including:

[0012] The hydration stirring mechanism is configured as a hydration space with heat preservation and pressure maintenance, wherein the hydration space is provided with a planetary multi-group stirring element with multi-path high-speed timing stirring, and the building phosphogypsum powder, dihydrate phosphogypsum powder, hydration regulating aid and water are intermittently added into the hydration space synchronously or asynchronously, wherein the building phosphogypsum powder is used to delay the hydration reaction time of the dihydrate phosphogypsum powder and allow the two to have sufficient time to be fully stirred with water, wherein the dihydrate phosphogypsum powder is used to accelerate the hydration speed of the building phosphogypsum powder, and the hydration regulating aid The agent is used to initially separate water molecules from building phosphogypsum powder and dihydrate phosphogypsum powder, and wrap several water molecules in the water to form a granular water reservoir. Driven by the planetary multi-group stirring pieces, several granular water reservoirs are dispersed in the building phosphogypsum powder environment and attached to the surface of phosphogypsum particles and dihydrate phosphogypsum powder. The planetary multi-group stirring pieces exert stirring force on the building phosphogypsum powder, dihydrate phosphogypsum powder, hydration regulating additive and water, forcing the granular water reservoir to gradually fully hydrate the building phosphogypsum powder and dihydrate phosphogypsum powder.

[0013] A dry material metering mechanism is configured to measure and weigh the building phosphogypsum powder and dihydrate phosphogypsum powder, and to transport them vertically downward into the hydration space in a quantitative manner;

[0014] The liquid material metering mechanism is configured to measure and weigh water and hydration regulating aids so as to spray them quantitatively upward or downward into the hydration space.

[0015] The determining factor of the strength development of phosphogypsum brickwork in the present invention lies in the hydration of β-hemihydrate phosphogypsum. The hydration of β-hemihydrate phosphogypsum must meet both the requirements of rapid hydration and the strength development required to achieve the hardening of phosphogypsum brickwork. Therefore, the hydration control of β-hemihydrate phosphogypsum is very critical.

[0016] Therefore, in the present invention, building phosphogypsum powder, dihydrate phosphogypsum powder, hydration regulating aid and water are added into the hydration space synchronously or asynchronously and intermittently in a heat-insulating and pressure-maintaining hydration space. During the hydration reaction between the building phosphogypsum powder and the dihydrate phosphogypsum powder and water to form β-hemihydrate phosphogypsum, heat is released and utilized by the hydration space to form a heat-insulating environment. In the heat-insulating environment, the water content of the β-hemihydrate phosphogypsum generated by the building phosphogypsum powder and the dihydrate phosphogypsum powder is reduced, which helps to shorten the hardening and molding time of phosphogypsum brickwork.

[0017] At the same time, in this process, there is an interaction between construction phosphogypsum powder and dihydrate phosphogypsum powder. Since dihydrate phosphogypsum powder is the waste crushed material generated when producing phosphogypsum bricks, adding dihydrate phosphogypsum powder to construction phosphogypsum powder can not only ensure that the flexural and compressive strength of the product is much higher than the industry standard requirements, but also realize the resource utilization of waste bricks generated during production sites, factory areas, product transportation and construction, which saves raw material costs and is environmentally friendly. Dihydrate phosphogypsum powder (CaSO 4 ·2H 2 O crystals) have a high solubility, therefore, they dissolve under the action of water, and then combine with the dihydrate phosphogypsum crystal nuclei formed by the hydration of the building phosphogypsum powder to promote the growth and development of the dihydrate phosphogypsum crystal nuclei formed again, thereby accelerating the hydration rate of the building phosphogypsum powder.

[0018] However, since there is a small amount of insoluble substances in the building phosphogypsum powder (there are soluble impurities such as phosphorus and fluorine in the building phosphogypsum powder itself, when it reacts with water, the soluble phosphorus, fluorine and Ca 2+When dissolved in water, a chemical reaction occurs between the three to generate insoluble substances), and a small amount of insoluble substances will cover the surface of the dihydrate phosphogypsum powder, thereby hindering the combination of the dihydrate phosphogypsum powder with water, thereby delaying the hydration time of the dihydrate phosphogypsum powder, making the dihydrate phosphogypsum powder act on the hydration speed of the building phosphogypsum powder, delaying the hydration time of the building phosphogypsum powder, ensuring that the dihydrate phosphogypsum powder and the building phosphogypsum powder have sufficient time to be quickly and evenly mixed under the action of the planetary multi-group stirring parts, and at the same time, shortening the time for the building phosphogypsum powder to produce viscosity after hydration, reducing the amount of adhesion of the produced β-hemihydrate phosphogypsum in the hydration stirring mechanism, and reducing the blocking force received by the planetary multi-group stirring parts during stirring.

[0019] Therefore, the present invention uses the hydration, coagulation and hardening characteristics of the building phosphogypsum powder in combination with the hydration characteristics of the dihydrate phosphogypsum powder of the waste crushed material to act on the hydration molding of the building phosphogypsum powder, and uses a dry material metering mechanism to measure and weigh the addition amount of the building phosphogypsum powder and the addition amount of the dihydrate phosphogypsum powder, thereby adjusting the addition amount of the building phosphogypsum powder and the addition amount of the dihydrate phosphogypsum powder in real time to accurately control the hydration speed and hydration degree of the building phosphogypsum powder.

[0020] In addition, the present invention utilizes a liquid material metering mechanism to measure and weigh the hydration regulating auxiliary agent and water, adjusts the amount of the hydration regulating auxiliary agent and the amount of the water added in real time, and simultaneously sprays the liquid mixed with the hydration regulating auxiliary agent and water in a circular upward or downward quantitative manner toward the hydration space. With this design, the liquid can be uniformly sprayed on the surface of the building phosphogypsum powder and the dihydrate phosphogypsum powder, and the building phosphogypsum powder and the dihydrate phosphogypsum powder are stirred and uniformly mixed with the liquid by the planetary multi-group stirring members; in this process, the hydration regulating auxiliary agent in the liquid separates the water from the building phosphogypsum powder and the dihydrate phosphogypsum powder in the initial state, and can delay the hydration of the building phosphogypsum powder and the dihydrate phosphogypsum powder. At the same time, the water molecules in the water are wrapped in combination with the hydration regulating auxiliary agent to form a granular water reservoir, and several granular water reservoirs are attached to the surface of the phosphogypsum particles and the dihydrate phosphogypsum powder in the building phosphogypsum powder environment, thereby ensuring that the surface of the phosphogypsum particles and the dihydrate phosphogypsum powder is evenly distributed with the water addition amount that can hydrate both, and effectively reducing the water addition amount.

[0021] Under the high-speed shear stirring of the planetary multi-group stirring parts, water and construction phosphogypsum powder, dihydrate phosphogypsum powder and hydration regulating additives can be fully and evenly mixed under the condition of low water addition, thereby ensuring the quality stability of the formed phosphogypsum bricks; combined with the mutual chemical action between the construction phosphogypsum powder, dihydrate phosphogypsum powder and hydration regulating additives, high-speed shear stirring is carried out in the heat-insulating and pressure-maintaining hydration space to delay the hydration time of the construction phosphogypsum powder and dihydrate phosphogypsum powder, thereby extending the setting time of β-hemihydrate phosphogypsum, and allowing the construction phosphogypsum powder, dihydrate phosphogypsum powder and hydration regulating additives to be quickly and fully mixed, thereby ensuring the strength and stability of the formed phosphogypsum bricks.

[0022] Therefore, the present invention measures and controls the addition amounts of building phosphogypsum powder, dihydrate phosphogypsum powder, hydration regulating and controlling agent and water through a hydration stirring mechanism, a dry material metering mechanism and a liquid material metering mechanism, and adopts different adding methods to add them into the hydration space in the hydration stirring mechanism. The building phosphogypsum powder and dihydrate phosphogypsum powder are added into the hydration space in a vertical downward manner, and the two will be initially mixed during the adding process, so that the building phosphogypsum powder and dihydrate phosphogypsum powder in the hydration space have been mixed; at this time, the liquid formed by the hydration regulating and controlling agent and water is sprayed upward or downward in a circumferential manner, and the liquid is spread on the surface of the building phosphogypsum powder and dihydrate phosphogypsum powder in the middle and peripheral parts of the hydration space, and under the complementary effects of the building phosphogypsum powder, the dihydrate phosphogypsum powder and the hydration regulating and controlling agent, the hydration is precisely regulated in the batching process of generating β-hemihydrate phosphogypsum during the hydration of the building phosphogypsum powder, and at the same time, the amount of water added is reduced by utilizing the heat preservation and pressure maintenance environment of the hydration space.

[0023] Under the action of the planetary multi-group stirring elements, the building phosphogypsum powder, the dihydrate phosphogypsum powder and the water are fully mixed, which can ensure that the hydration reaction of the β-hemihydrate phosphogypsum is thorough; then the hydration characteristics of the building phosphogypsum powder and the dihydrate gypsum, and the dispersibility of the hydration regulating auxiliary agent are utilized, and the two complement each other to achieve the delay of the hydration time, shorten the time for the building phosphogypsum powder to produce viscosity after hydration, so as to adjust the viscosity of the β-hemihydrate phosphogypsum in real time according to the added amounts of the building phosphogypsum powder, the dihydrate gypsum and the hydration regulating auxiliary agent, the hydration temperature of the hydration space, and the stirring time of the planetary multi-group stirring elements, thereby reducing the phenomenon of transportation blockage caused by the viscosity of the β-hemihydrate phosphogypsum and extending the service life of the regulating device of the present invention.

[0024] 2) The semi-dry phosphogypsum bricklaying hydration control device according to 1), wherein:

[0025] The hydration space is also mixed with polypropylene short fibers, wherein the weight component of the building phosphogypsum powder is 100 parts, the weight component of the dihydrate phosphogypsum powder is 8-10 parts, the weight component of the polypropylene short fibers is 0.05-0.1 parts, the weight component of the hydration regulating auxiliary agent is 0.1-0.2 parts, and the weight component of the water is 28-32 parts.

[0026] The weight component of the dihydrate phosphogypsum powder in the present invention accounts for 8%-10% of the weight component of the building phosphogypsum powder. The use of the dihydrate phosphogypsum powder can fully promote the growth and development of crystal nuclei in the hydration process of the building phosphogypsum powder; the weight component of the hydration regulating auxiliary agent accounts for 0.1%-0.2% of the weight component of the building phosphogypsum powder. Compared with the prior art in which a large amount of modifiers are added, the present invention adopts the hydration regulating auxiliary agent to interact with the dihydrate phosphogypsum powder, and the water in the hydration regulating auxiliary agent is used to form several granular reservoirs to hydrate the dihydrate phosphogypsum powder. The two act together on the building phosphogypsum powder, which not only reduces the addition amount of the hydration regulating auxiliary agent, but also ensures the utilization rate and filling rate of the building phosphogypsum powder in the beta-hemihydrate phosphogypsum generated by the dihydrate phosphogypsum powder and the hydration regulating auxiliary agent, and at the same time reduces the cost of preparing the beta-hemihydrate phosphogypsum into phosphogypsum bricks.

[0027] On this basis, the present invention also incorporates polypropylene short fibers in the hydration space, and the polypropylene short fibers are mixed in the stirring process of the planetary multi-group stirring pieces. Therefore, when the building phosphogypsum powder, dihydrate phosphogypsum powder, hydration control additive and water are uniformly stirred, the polypropylene short fibers will be evenly laid in the hydrated β-semihydrate phosphogypsum, and the high-pressure extrusion and the pulling of the polypropylene short fibers in the β-semihydrate phosphogypsum forming process form the initial strength of the phosphogypsum brickwork, so that the polypropylene short fibers will strengthen the strength of the phosphogypsum brickwork, so that the breaking load of the phosphogypsum brickwork can generally reach about 10000N (the industry 69 standard requires more than 2000N), and the compressive strength can generally reach more than 5MPa. Even if the product is loaded and transported immediately after it is off the line, it will not be damaged by the bumps during transportation. The problem of damage to the original phosphogypsum brickwork during transportation is fundamentally solved.

[0028] 3) The semi-dry phosphogypsum brick hydration control device according to 2), wherein:

[0029] The hydration control auxiliary agent includes a dispersant and a resin, and the dispersant and the resin are prepared in a weight ratio of 1:(2-3).

[0030] The resin in the present invention can wrap several water molecules in water to form granular water, and the dispersant can disperse water in the building phosphogypsum powder and the dihydrate phosphogypsum powder, and prevent the water and the building phosphogypsum powder or the dihydrate phosphogypsum powder from aggregating and reacting with each other. At the same time, the dispersant and the resin are combined to wrap water molecules to form a granular water reservoir, and when the granular water reservoir is in a static state, the granular water reservoir will not be hydrated with the building phosphogypsum powder or the dihydrate phosphogypsum powder, and the granular water reservoir can be evenly dispersed under the action of the dispersant, so as to prevent water from being deposited at the bottom of the hydration mixing box.

[0031] In addition, the dispersant and resin designed in the present invention are formulated in a weight component ratio of 1: (2-3). In the market, the price of the resin is lower than that of the dispersant. Therefore, compared with the modifier in the prior art, the present invention reduces the addition of the modifier, thereby reducing the cost of preparing β-hemihydrate phosphogypsum into phosphogypsum bricks; in addition, the weight component of the resin accounts for 2-3 times that of the dispersant. Therefore, the water absorption rate of the resin is used to greatly increase the water storage capacity of the granular water reservoir, and the dispersant is used to reduce the viscosity and viscosity of the resin, thereby improving the flowability of the resin, so that the granular water reservoir formed by the resin-shaped water molecules can be evenly distributed on the surface of the building phosphogypsum powder and the dihydrate phosphogypsum powder, thereby improving the uniform mixing during stirring and ensuring that the hydration reaction of the β-hemihydrate phosphogypsum is thorough.

[0032] 4) The semi-dry phosphogypsum brick hydration control device according to 1), wherein:

[0033] The hydration stirring mechanism includes a hydration stirring box having a hydration space, a plurality of anti-sticking plates are embedded in the inner wall of the hydration stirring box, the plurality of anti-sticking plates are arranged in a surrounding and uniform manner on the inner wall of the hydration stirring box, a plurality of anti-sticking plates are embedded in the inner bottom surface of the hydration stirring box, the plurality of anti-sticking plates are spread all over the inner bottom surface of the hydration stirring box, and there are gaps between adjacent anti-sticking plates.

[0034] In the prior art, the production of phosphogypsum bricks is prone to the following technical problems during the high-speed shear mixing process: since the construction phosphogypsum powder is hydrated when it comes into contact with water, it is easy for the construction phosphogypsum powder to adhere to and agglomerate with the inner wall of the hydration mixing box after hydration, resulting in blockage of the output port of the hydration mixing box, which cannot be unblocked without special tools, seriously affecting continuous operation.

[0035] Therefore, in order to solve the above technical problems, the present invention uses several anti-sticking plates to pave the inner wall and inner bottom of the hydration mixing box, wherein a part of the anti-sticking plates are arranged in a surrounding manner and evenly on the inner wall of the hydration mixing box, thereby reducing the adhesion and agglomeration of the building phosphogypsum powder on the inner wall of the hydration mixing box after hydration, and the other part of the anti-sticking plates are arranged on the inner bottom surface of the hydration mixing box, thereby avoiding the adhesion and agglomeration of the building phosphogypsum powder after hydration and then adhering to the inner bottom surface of the hydration mixing box, reducing the excessive resistance of the planetary multi-group stirring parts during the stirring process, and extending the service life of the planetary multi-group stirring parts. At the same time, several anti-sticking plates can reduce the adhesion and agglomeration of the building phosphogypsum powder after hydration, thereby reducing the blockage of the hydration mixing box, enabling continuous operation, and reducing the number of maintenance times.

[0036] In addition, the gaps between several adjacent anti-sticking plates in the present invention have two functions: the first function is to provide space for the anti-sticking plates to expand and contract due to heat, so that the expansion of the anti-sticking plates due to the heat generated after the construction phosphogypsum powder is hydrated will not squeeze the adjacent anti-sticking plates, thereby avoiding the phenomenon that the peripheral sides of the anti-sticking plates bulge after being subjected to force, resulting in gaps on the peripheral sides of the anti-sticking plates, causing steam generated after the construction phosphogypsum powder is hydrated to enter the space between the anti-sticking plates and the inner wall of the hydration mixing box through the gaps, not only damaging the hydration mixing box, but also affecting the stirring operation of the planetary multi-group stirring members, resulting in incomplete hydration of the construction phosphogypsum powder, thereby affecting the stability of the hydration of the construction phosphogypsum powder in the hydration space.

[0037] The second function is to provide an insulating environment for the hydration space. When the building phosphogypsum powder is put into the hydration space and subjected to high-speed shear stirring in the hydration space, some of the building phosphogypsum powder will accumulate in the gap between adjacent anti-sticking plates. The heat generated during the hydration of the building phosphogypsum powder in the gap will be released into the hydration space, thereby ensuring that the hydration space is in a relatively stable temperature environment, thereby providing a stable environment for the hydration of the building phosphogypsum powder.

[0038] 5) The semi-dry phosphogypsum brick hydration control device according to 4), wherein:

[0039] The planetary multi-group stirring element includes a planetary frame which is arranged on the top of the hydration stirring box and rotates. The planetary frame extends toward the hydration space in the hydration stirring box and is provided with a first stirring group, a second stirring group and a third stirring group. The first stirring group and the third stirring group have the function of self-rotation. The second stirring group extends toward the inner wall of the hydration stirring box, and the second stirring group can scrape off the lumps of building phosphogypsum powder attached to the inner wall of the hydration stirring box after hydration.

[0040] When the planetary frame in the present invention rotates, it drives the first stirring group, the second stirring group and the third stirring group in the hydration stirring box to synchronously revolve around the center point of the hydration stirring box (the hydration stirring box of the present invention adopts the existing planetary mixer, and the structure of the planetary mixer and the connection method of each part are existing technologies, which are not repeated here). The first stirring group and the third stirring group rotate at high speed, so that the building phosphogypsum powder and the dihydrate phosphogypsum powder are subjected to strong shearing and kneading effects, so as to achieve the purpose of sufficient dispersion and mixing; in addition, when the second stirring group on the planetary frame rotates with the planetary frame, it continuously scrapes the hydrated lumps of the building phosphogypsum powder attached to the inner wall of the hydration stirring box, thereby scraping off the lumps from the inner wall of the hydration stirring box, so that there is no retained material on the inner wall of the hydration stirring box, and the mixing effect is improved.

[0041] 6) The semi-dry phosphogypsum bricklaying hydration control device according to 5), wherein:

[0042] The first stirring group includes a first rotating body matched with the planetary frame, the first rotating body has a first stirring shaft extending toward the hydration space, the end of the first stirring shaft is fixed to the middle of the rotating rod, the central axis of the rotating rod is perpendicular to the central axis of the first stirring shaft, both ends of the rotating rod respectively extend toward the hydration space with first stirring rods, and the end of the first stirring rod is fixed with a stirring shovel for shoveling and stirring the building phosphogypsum powder and dihydrate phosphogypsum powder;

[0043] The third stirring group includes a second rotating body matched with the planetary frame, the second rotating body has a third stirring shaft extending toward the hydration space, the end of the third stirring shaft is connected to several layers of fan blade assemblies arranged along the height direction of the hydration stirring box, and the fan blade assembly is used to spirally stir the building phosphogypsum powder and dihydrate phosphogypsum powder.

[0044] In the present invention, the first stirring group and the third stirring group revolve around the center line of the hydration stirring box driven by the planetary frame to perform rough stirring of the building phosphogypsum powder, dihydrate phosphogypsum powder, hydration regulating auxiliary agent and water; in order to achieve precision stirring, the first stirring shaft is driven to rotate by the first rotating body, and the third stirring shaft is driven to rotate by the second rotating body (the hydration stirring box of the present invention adopts the existing planetary mixer, and the structure of the planetary mixer and the connection method of each part are the existing technology, which will not be repeated here), so that the first stirring shaft drives the rotating rod to rotate in the horizontal direction, and the two ends of the rotating rod respectively drive the first stirring rod to rotate, so that the stirring shovel at the end of the first stirring rod can stir the building phosphogypsum powder and dihydrate phosphogypsum powder at the local position; at the same time, during the rotation of the third stirring shaft, it drives several layers of fan blade assemblies arranged along the height direction of the hydration stirring box to perform spiral stirring of the building phosphogypsum powder and dihydrate phosphogypsum at the local position, thereby improving the stirring and mixing uniformity of the building phosphogypsum powder and dihydrate phosphogypsum in a local stirring manner, and improving the thorough hydration of the building phosphogypsum powder and dihydrate phosphogypsum.

[0045] In the present invention, the fan blade assembly includes a rotating sleeve, the top and bottom of the rotating sleeve both have a snap-on connection structure, and stirring blades extend outward from both sides of the rotating sleeve, and the central axis of the stirring blades is perpendicular to the central axis of the rotating sleeve. Therefore, the fan blade assemblies adjacent in the height direction of the present invention are fixedly connected by the snap-on connection structures at the top and bottom of the rotating sleeve, and the overall connection stability is improved by the snap-on connection structure. At the same time, according to the mixing amount of the building phosphogypsum powder and dihydrate phosphogypsum, the number of layers of the fan blade assembly can be adjusted in real time by the snap-on connection structure.

[0046] In addition, the stirring blades arranged on both sides of the rotating sleeve stir the construction phosphogypsum powder and dihydrate phosphogypsum powder at local height positions in real time during the rotation process, and the stirring blades on several layers of rotating sleeves can stir the local deposition of construction phosphogypsum powder and dihydrate phosphogypsum powder in the hydration mixing box, preventing the construction phosphogypsum powder and dihydrate phosphogypsum from being deposited at the bottom of the hydration mixing box.

[0047] 7) The semi-dry phosphogypsum brick hydration control device according to 5), wherein:

[0048] The second stirring group includes a second stirring shaft connected to the planetary frame, and a tilting rod extending toward the hydration space is fixed to the end of the second stirring shaft. The tilting rod is inclined, and a scraper plate close to the inner wall of the hydration stirring box is fixed to the end of the tilting rod. The scraper plate is made of polytetrafluoroethylene, and there is a space gap of 3 mm between the end surface of the scraper plate and the inner wall of the hydration stirring box.

[0049] The technology for connecting the second stirring shaft and the planetary frame in the second stirring group of the present invention is the technology of the planetary mixer (the structure of the planetary mixer and the connection method of each part are the existing technology and will not be repeated here). The scraper plate is fixed close to the inner wall of the hydration stirring box by the tilting rod connected to the second stirring shaft. At the same time, the scraper plate is made of polytetrafluoroethylene. Because polytetrafluoroethylene has the minimum surface tension, does not adhere to any substance, and has the characteristics of low friction coefficient, the scraper plate has the characteristics of non-adhesion and friction resistance, thereby extending the service life of the scraper plate and reducing the maintenance frequency and maintenance cost of the hydration stirring box.

[0050] When the scraper plate revolves with the planetary carrier, there is a space between the end surface of the scraper plate and the inner wall of the hydration mixing box, so the end surface of the scraper plate will not directly contact the inner wall of the hydration mixing box. Therefore, the space can ensure that the scraper plate can scrape off the lumps of building phosphogypsum powder on the inner wall of the hydration mixing box after hydration, and avoid scratching the surface of the inner wall of the hydration mixing box. At the same time, the space can provide the inner wall of the hydration mixing box with deformation space due to thermal expansion and contraction at a certain temperature.

[0051] 8) The semi-dry phosphogypsum brick hydration control device according to 1), wherein:

[0052] The liquid material metering mechanism includes a water metering tank for metering the hydration regulating aid and water, and a water supply ring pipe in an annular structure arranged in the hydration stirring tank, the water supply ring pipe is connected with a water inlet pipe and several water delivery pipes, the other end of the water inlet pipe is connected with the water metering tank, and the water metering tank inputs the liquid formed by the mixture of the hydration regulating aid and water into the water inlet pipe;

[0053] The several water pipes are evenly distributed along the annular path of the water supply ring pipe, and the other end of each water pipe is connected to the middle of the main shaft sleeve. The central axis of the main shaft sleeve is perpendicular to the central axis of the water pipe. The two ends of the main shaft sleeve are respectively rotatably connected with the first connecting pipes, and the two first connecting pipes have opposite pipe openings respectively connected with the secondary shaft sleeve. The other end of each secondary shaft sleeve is rotatably connected with the second connecting pipe, and the end of the second connecting pipe away from the secondary shaft sleeve is connected with the side shaft sleeve. The side shaft sleeve, the secondary shaft sleeve and the main shaft sleeve are respectively connected with injection pipes, and the end of the injection pipe is rotatably connected with a spiral injection nozzle in a spiral shape.

[0054] The present invention utilizes a water metering tank to respectively proportion the hydration regulating auxiliary agent and water by weight components. When the water metering tank completes the mixing of the hydration regulating auxiliary agent and water to form a liquid, the water metering tank inputs the liquid into a water inlet pipe, and the water inlet pipe inputs the liquid into a water supply ring pipe. Since the water supply ring pipe is an annular structure, the liquid flows along an annular path, and is sprayed into the hydration space through a spiral injection nozzle of an injection pipe via several water delivery pipes on the water supply ring pipe.

[0055] In this process, the liquid after the hydration regulating auxiliary agent and water are prepared is evenly mixed in the process of passing through the water inlet pipe and the water supply ring pipe, and the spirally flowing liquid is sprayed out through the spiral spray nozzle, which generates a spiral high-pressure flow mechanical force for the construction phosphogypsum powder and the dihydrate phosphogypsum powder, mixes with the construction phosphogypsum powder and the dihydrate phosphogypsum powder and is thoroughly and evenly hydrated under the action of the stirring mechanical force; at the same time, the present invention utilizes the rotation performance of the side shaft sleeve, the secondary shaft sleeve and the main shaft sleeve to change the direction of the injection pipe connected to the side shaft sleeve, the secondary shaft sleeve and the main shaft sleeve, and according to the use requirements, the injection pipe at each position is rotated to change the injection direction of the injection pipe.

[0056] For example: when a small amount of lumps of building phosphogypsum powder or dihydrate phosphogypsum powder are accumulated on the inner wall of the hydration mixing box, the injection pipe close to the lumps is rotated so that the high-pressure liquid sprayed from the spiral injection nozzle on the injection pipe impacts the lump position, and combined with the scraper plate, the lumps on the inner wall of the hydration mixing box fall into the hydration space to form β-hemihydrate phosphogypsum; in addition, the injection pipe can also spray liquid at high pressure toward the scraper plate, mixing shovel, mixing blades and other components in the planetary multi-group mixing parts.

[0057] Alternatively, in order to demonstrate the hydration effect of the building phosphogypsum powder and the dihydrate phosphogypsum powder, the spiral injection nozzles on several injection pipes can all be directed toward the feeding path of the building phosphogypsum powder and the dihydrate phosphogypsum falling into the hydration space. The impact force formed by the building phosphogypsum powder and the dihydrate phosphogypsum powder falling downward due to gravity coincides with the high-pressure liquid impact force of all the spiral injection nozzles, and an initial high shear force is generated between the two, so that the liquid and the building phosphogypsum powder and the dihydrate phosphogypsum powder are fully and evenly mixed, and the building phosphogypsum powder and the dihydrate phosphogypsum powder can also be completely hydrated.

[0058] 9) The semi-dry phosphogypsum brick hydration control device according to 1), wherein:

[0059] The dry material metering mechanism includes a feed frame arranged on one side of a hydration mixing box, a metering hopper for metering construction phosphogypsum powder and dihydrate phosphogypsum powder is installed in the feed frame, two spiral conveying pipes arranged in the height direction are arranged on the top of the metering hopper, one of the spiral conveying pipes is used to convey the construction phosphogypsum powder, and the other spiral conveying pipe is used to convey the dihydrate phosphogypsum powder, the two spiral conveying pipes are connected to the sides of the metering hopper respectively with feed pipes for conveying the construction phosphogypsum powder or dihydrate phosphogypsum powder into the metering hopper, and the bottom of the metering hopper has a pipeline connected to the feed port of the hydration mixing box.

[0060] The present invention adopts a metering hopper to weigh and measure the building phosphogypsum powder or dihydrate phosphogypsum powder paste transported by a spiral conveying pipe. When the weight is sufficient, the conveying of the spiral conveying pipe is stopped, thereby ensuring the weight components of the building phosphogypsum powder and dihydrate phosphogypsum powder.

[0061] 10) A control method for applying the semi-dry phosphogypsum brick hydration control device according to any one of 1) to 9) to a semi-dry phosphogypsum brick hydration control device, comprising the following steps:

[0062] Step 1, dry material control and metering: conveying construction phosphogypsum powder into the metering hopper through a spiral conveying pipe, measuring 100 parts of construction phosphogypsum powder by weight in the metering hopper, and adding it into the hydration mixing box through the metering hopper; conveying dihydrate phosphogypsum powder into the metering hopper through another spiral conveying pipe, measuring 8-10 parts of dihydrate phosphogypsum powder by weight in the metering hopper, and adding it into the hydration mixing box through the metering hopper;

[0063] Step 2: Liquid material control and metering: 0.1-0.2 parts by weight of a hydration control agent and 28-32 parts by weight of water are metered through a water meter tank. The hydration control agent and water are mixed in the water meter tank to form a liquid, and the high-pressure liquid is directed toward the injection pipes at various positions of the hydration mixing tank through a water supply ring pipe;

[0064] Step 3, initial hydration regulation: utilize the high-pressure flow mechanical force formed by the directional injection of high-pressure liquid from the injection pipe in step 2 to impact the building phosphogypsum powder or dihydrate phosphogypsum powder in step 3 at a high speed to generate an initial high shear force and act on the building phosphogypsum powder and dihydrate phosphogypsum powder to form an initial uniform mixture. At the same time, the hydration and condensation characteristics of the dihydrate phosphogypsum powder and the building phosphogypsum powder complement each other, and the hydration rate of the building phosphogypsum powder is accurately regulated by the addition amount of the two weight components, thereby adjusting the initial setting time of the β-hemihydrate phosphogypsum to control the initial setting time to 4 minutes. + 30S;

[0065] Step 4, regulating hydration characteristics: using the liquid formed by mixing the hydration regulating auxiliary agent and water in step 3, during the process of conveying to the injection pipe, the hydration regulating auxiliary agent wraps several water molecules in the water to form a granular water reservoir, when the liquid impacts the building phosphogypsum powder or dihydrate phosphogypsum powder at a high speed, the granular water reservoir disperses the water and the building phosphogypsum powder or dihydrate phosphogypsum powder under the action of the hydration regulating auxiliary agent, accurately regulates the hydration time of the building phosphogypsum powder and dihydrate phosphogypsum powder, and acts on the hydration speed of the building phosphogypsum powder in step 3, so that the hydration reaction of β-hemihydrate phosphogypsum is thorough;

[0066] Step 5, stirring speed control and regulation: through the planetary multi-group stirring parts with single power input and multiple output, the stirring shovel, stirring blade and scraper plate form different speed and different direction stirring, and at the same time, combined with the space between the scraper plate and the anti-sticking plate embedded in the inner wall of the hydration stirring box, the stirring shovel, stirring blade and scraper plate form a high-speed shear force of 165-260 revolutions per minute at 45S. During the stirring process, 0.05-0.1 parts by weight of polypropylene short fibers are added into the hydration stirring box to quickly promote the thorough hydration reaction between the building phosphogypsum powder, dihydrate phosphogypsum powder, hydration control additive and water in step 4, so that the β-hemihydrate phosphogypsum has a certain fluidity.

[0067] The present invention utilizes dihydrate phosphogypsum powder to promote the growth and development of dihydrate phosphogypsum crystal nuclei formed by building phosphogypsum powder, thereby accelerating the hydration speed of building phosphogypsum powder. While promoting the hydration speed of building phosphogypsum powder, the insoluble substances generated by phosphogypsum itself in turn inhibit the hydration speed of building phosphogypsum powder. Combined with the formation of a granular reservoir of a hydration regulating auxiliary agent and the characteristics of the uniformly dispersed granular reservoir, the hydration time of building phosphogypsum powder can be controlled, thereby overcoming the instability caused by inconsistent quality of building phosphogypsum powder. In addition, during the stirring process of high-speed shear force, the rapid and uniform mixing reaction of building phosphogypsum powder is accelerated, the phenomenon of incomplete hydration of building phosphogypsum powder is reduced, and agglomeration and clogging are also avoided.

[0068] Compared with the prior art, the present invention also has the following technical effects:

[0069] The present invention starts from the hydration, coagulation and hardening characteristics of β-hemihydrate phosphogypsum, and accurately controls the hydration speed and hydration degree of building phosphogypsum powder by adding a hydration regulating auxiliary agent, dihydrate phosphogypsum powder, so as to effectively control the hydration of building phosphogypsum powder in the mixing and molding processes, avoid the coagulation and hardening of the building phosphogypsum powder caused by the hydration of the β-hemihydrate phosphogypsum in the mixing and material conveying process to the molding equipment, thereby avoiding the uneven mixing and the degradation of the product quality, and at the same time ensuring the rapid coagulation and hardening of the building phosphogypsum powder in the molding process, so as to facilitate the rapid molding.

[0070] During the mixing and transportation process of construction phosphogypsum powder, in order to achieve sufficient mixing of construction phosphogypsum powder, dihydrate phosphogypsum powder, hydration regulating additives and water in the hydration mixing box, while reducing the hydration of β-hemihydrate phosphogypsum, the hydration time of construction phosphogypsum powder and dihydrate phosphogypsum powder is delayed by hydration regulating additives. At the same time, dihydrate phosphogypsum and high-speed shear force are used to ensure that all raw materials can be mixed evenly within 75S of stirring time and transportation time, and reduce the hydration of β-hemihydrate phosphogypsum, thereby ensuring the stable operation of the semi-dry continuous production line.

[0071] At the same time, in order to address the technical difficulties that the hydration and hardening time of β-hemihydrate phosphogypsum is relatively long, and it takes a certain amount of time for hydration and hardening to have a certain strength for demolding, making it difficult to use the pressing method for continuous molding, a hydration control auxiliary agent for building phosphogypsum powder has been developed, which can shorten the hydration and hardening time of β-hemihydrate phosphogypsum and accurately control the hydration rate. A certain amount of hydration control auxiliary agent is added to a β-hemihydrate phosphogypsum mixture with a water addition amount of about 30%. The hydration rate of β-hemihydrate phosphogypsum can be effectively reduced during the mixing and conveying process of all raw materials, and the rapid hydration and coagulation and hardening of β-hemihydrate phosphogypsum can be promoted during the molding process, thereby ensuring the stable quality and performance of the molded bricks. BRIEF DESCRIPTION OF THE DRAWINGS

[0072] Figure 1 It is a schematic diagram of the structure of the semi-dry phosphogypsum bricklaying hydration control equipment of the present invention.

[0073] Figure 2 for Figure 1 Sectional view of AA.

[0074] Figure 3 for Figure 2 A partial enlarged view of point B1 in the middle.

[0075] Figure 4 This is a stirring operation trajectory diagram at 45S in the semi-dry phosphogypsum bricklaying hydration control equipment of the present invention. DETAILED DESCRIPTION

[0076] The following is further described in detail through specific implementation methods:

[0077] The figure marks in the drawings of the specification include: hydration mixing box 1, box cover 2, feed frame 3, metering hopper 4, spiral conveying pipe 5, feed pipe 6, servo motor 7, planetary frame 8, pressure relief pipe 9, first stirring shaft 10, rotating rod 11, first stirring rod 12, water metering box 13, stirring shovel 14, second stirring shaft 15, tilting rod 16, scraper plate 17, third stirring shaft 18, rotating sleeve 19, stirring blade 20, anti-sticking plate 21, bolt 22, water supply ring pipe 23, water delivery pipe 24, main shaft sleeve 25, first connecting pipe 26, second connecting pipe 27, side shaft sleeve 28, secondary shaft sleeve 29, injection pipe 30, spiral injection nozzle 31.

[0078] Reference will now be made in detail to embodiments disclosed herein, examples of which are described herein and illustrated in the accompanying drawings. Although the present disclosure will be described in conjunction with embodiments and / or examples, they do not limit the present disclosure to these embodiments and / or examples. On the contrary, the present disclosure covers alternatives, modifications and equivalents.

[0079] This embodiment sees Figure 1 As shown, the semi-dry phosphogypsum bricklaying hydration control equipment includes a hydration stirring mechanism, a dry material metering mechanism and a liquid material metering mechanism; wherein the hydration stirring mechanism is configured as a hydration space with heat preservation and pressure maintenance, and the hydration space has a planetary multi-group stirring element with multi-path high-speed timed stirring, and the building phosphogypsum powder, dihydrate phosphogypsum powder, hydration control auxiliary agent and water are intermittently added into the hydration space synchronously and asynchronously.

[0080] The construction phosphogypsum powder is used to delay the hydration reaction time of dihydrate phosphogypsum powder and allow both to have sufficient time to be fully mixed with water. The dihydrate phosphogypsum powder is used to accelerate the hydration speed of the construction phosphogypsum powder. The hydration regulating additive is used to initially separate water molecules and the construction phosphogypsum powder and dihydrate phosphogypsum powder, and to wrap several water molecules in the water to form a granular water reservoir. Driven by the planetary multi-group stirring elements, several granular water reservoirs are dispersed in the construction phosphogypsum powder environment and attached to the surface of the phosphogypsum particles and dihydrate phosphogypsum powder. The planetary multi-group stirring elements apply stirring force to the construction phosphogypsum powder, dihydrate phosphogypsum powder, hydration regulating additive and water, forcing the granular water reservoir to gradually and fully hydrate the construction phosphogypsum powder and dihydrate phosphogypsum powder.

[0081] The dry material metering mechanism is configured to measure and weigh the building phosphogypsum powder and dihydrate phosphogypsum powder, and transport them vertically downward in a quantitative manner into the hydration space; the liquid material metering mechanism is configured to measure and weigh the water and hydration regulating auxiliary agent, and spray them quantitatively into the hydration space in a circular upward or downward direction.

[0082] The determining factor for the strength development of phosphogypsum brickwork in this embodiment is the hydration of β-hemihydrate phosphogypsum. The hydration of β-hemihydrate phosphogypsum must meet both the requirements of rapid hydration and the strength development required to achieve the hardening of phosphogypsum brickwork. Therefore, the hydration control of β-hemihydrate phosphogypsum is very critical.

[0083] Therefore, in this embodiment, in a hydration space that is insulated and pressurized, construction phosphogypsum powder, dihydrate phosphogypsum powder, hydration regulating aid and water are intermittently added into the hydration space in a synchronous or asynchronous manner. In the process that the construction phosphogypsum powder and dihydrate phosphogypsum powder respectively undergo hydration reaction with water to form β-hemihydrate phosphogypsum, heat is released and utilized by the hydration space to form a thermal insulation environment. In the thermal insulation environment, the moisture content of the β-hemihydrate phosphogypsum generated by the construction phosphogypsum powder and dihydrate phosphogypsum powder is reduced, which helps to shorten the hardening and molding time of phosphogypsum brickwork.

[0084] At the same time, in this process, the interaction between building phosphogypsum powder and dihydrate phosphogypsum powder occurs. Since dihydrate phosphogypsum powder is the waste crushed material produced when producing phosphogypsum bricks, adding dihydrate phosphogypsum powder to building phosphogypsum powder can not only ensure that the flexural and compressive strengths of the product are far higher than the industry standard requirements, but also realize the resource utilization of waste bricks generated during production sites, factory areas, product transportation and construction, which saves raw material costs and is environmentally friendly. Dihydrate phosphogypsum powder (CaSO4·2H2O crystals) has a high solubility, so it dissolves under the action of water, and after dissolution, it combines with the dihydrate phosphogypsum crystal nuclei formed by the hydration of building phosphogypsum powder to promote the growth and development of the dihydrate phosphogypsum crystal nuclei formed again, thereby accelerating the hydration speed of building phosphogypsum powder.

[0085] However, since there is a small amount of insoluble substances generated in the construction phosphogypsum powder (the construction phosphogypsum powder itself contains soluble impurities such as phosphorus and fluorine. When it reacts with water to form a hydration reaction, the soluble phosphorus, fluorine and Ca2+ are dissolved in water, and a chemical reaction occurs between the three to form insoluble substances), and a small amount of insoluble substances will cover the surface of the dihydrate phosphogypsum powder, thereby hindering the combination of the dihydrate phosphogypsum powder with water, thereby delaying the hydration time of the dihydrate phosphogypsum powder, making the dihydrate phosphogypsum powder act on the hydration speed of the construction phosphogypsum powder, delaying the hydration time of the construction phosphogypsum powder, ensuring that the dihydrate phosphogypsum powder and the construction phosphogypsum powder have sufficient time to be quickly and evenly mixed under the action of the planetary multi-group stirring parts, and at the same time, shortening the time for the construction phosphogypsum powder to produce viscosity after hydration, reducing the amount of β-semihydrate phosphogypsum produced that adheres to the hydration stirring mechanism, and reducing the blocking force on the planetary multi-group stirring parts during stirring.

[0086] Therefore, this embodiment uses the hydration, coagulation and hardening characteristics of the construction phosphogypsum powder, combined with the hydration characteristics of the dihydrate phosphogypsum powder of the waste crushed material, to act on the hydration and molding of the construction phosphogypsum powder, and uses a dry material metering mechanism to measure and weigh the amount of construction phosphogypsum powder and the amount of dihydrate phosphogypsum powder added, so as to adjust the amount of construction phosphogypsum powder and the amount of dihydrate phosphogypsum powder added in real time to accurately control the hydration speed and hydration degree of the construction phosphogypsum powder.

[0087] In addition, the present embodiment uses a liquid material metering mechanism to measure and weigh the hydration regulating auxiliary agent and water, adjusts the amount of the hydration regulating auxiliary agent and the amount of the water added in real time, and at the same time sprays the hydration regulating auxiliary agent and the water mixed liquid into the hydration space in a circular upward or downward quantitative manner. With this design, the liquid can be evenly sprayed on the surface of the building phosphogypsum powder and the dihydrate phosphogypsum powder, and the building phosphogypsum powder and the dihydrate phosphogypsum powder are stirred and evenly mixed with the liquid by the planetary multi-group stirring members; in this process, the hydration regulating auxiliary agent in the liquid separates the water from the building phosphogypsum powder and the dihydrate phosphogypsum powder in the initial state, which can delay the hydration of the building phosphogypsum powder and the dihydrate phosphogypsum powder. At the same time, the water molecules in the water are wrapped in combination with the hydration regulating auxiliary agent to form a granular water reservoir, and several granular water reservoirs are attached to the surface of the phosphogypsum particles and the dihydrate phosphogypsum powder in the building phosphogypsum powder environment, thereby ensuring that the surface of the phosphogypsum particles and the dihydrate phosphogypsum powder is evenly distributed with the water addition amount that can hydrate both, effectively reducing the amount of water addition.

[0088] Under the high-speed shear stirring of the planetary multi-group stirring parts, water and construction phosphogypsum powder, dihydrate phosphogypsum powder and hydration regulating additives can be fully and evenly mixed under the condition of low water addition, thereby ensuring the quality stability of the formed phosphogypsum bricks; combined with the mutual chemical action between the construction phosphogypsum powder, dihydrate phosphogypsum powder and hydration regulating additives, high-speed shear stirring is carried out in the heat-insulating and pressure-maintaining hydration space to delay the hydration time of the construction phosphogypsum powder and dihydrate phosphogypsum powder, thereby extending the setting time of β-hemihydrate phosphogypsum, and allowing the construction phosphogypsum powder, dihydrate phosphogypsum powder and hydration regulating additives to be quickly and fully mixed, thereby ensuring the strength and stability of the formed phosphogypsum bricks.

[0089] Therefore, in this embodiment, the amount of building phosphogypsum powder, dihydrate phosphogypsum powder, hydration regulating auxiliary agent and water is metered and controlled by the hydration stirring mechanism, the dry material metering mechanism and the liquid material metering mechanism, and different adding methods are used to add them into the hydration space in the hydration stirring mechanism. The building phosphogypsum powder and dihydrate phosphogypsum powder are added into the hydration space in a vertical downward manner. The two will be initially mixed during the adding process, so that the building phosphogypsum powder and dihydrate phosphogypsum powder in the hydration space have been mixed; At this time, the liquid formed by the hydration regulating auxiliary agent and water is sprayed upward or downward in a circular manner, and the liquid is spread on the surface of the building phosphogypsum powder and dihydrate phosphogypsum powder in the middle and surrounding parts of the hydration space. Combined with the complementary effects of the building phosphogypsum powder, dihydrate phosphogypsum powder and the hydration regulating auxiliary agent, the hydration of the ingredients for generating β-hemihydrate phosphogypsum during the hydration process of the building phosphogypsum powder is precisely regulated. At the same time, the thermal insulation and pressure environment of the hydration space is utilized to reduce the amount of water added.

[0090] Under the action of the planetary multi-group stirring elements, the building phosphogypsum powder, the dihydrate phosphogypsum powder and the water are fully mixed to ensure that the hydration reaction of the β-hemihydrate phosphogypsum is thorough; then the hydration characteristics of the building phosphogypsum powder and the dihydrate gypsum, and the dispersibility of the hydration regulating auxiliary agent are utilized, and the two complement each other to achieve the delay of the hydration time, shorten the time for the building phosphogypsum powder to produce viscosity after hydration, and thus adjust the viscosity of the β-hemihydrate phosphogypsum in real time according to the added amount of the building phosphogypsum powder, the dihydrate gypsum powder and the hydration regulating auxiliary agent, the hydration temperature of the hydration space, and the stirring time of the planetary multi-group stirring elements, thereby reducing the phenomenon of transportation blockage caused by the viscosity of the β-hemihydrate phosphogypsum and extending the service life of the regulating device of this embodiment.

[0091] The hydration space is also mixed with polypropylene short fibers, wherein the weight component of building phosphogypsum powder is 100 parts, the weight component of dihydrate phosphogypsum powder is 8-10 parts, the weight component of polypropylene short fibers is 0.05-0.1 parts, the weight component of hydration regulating auxiliary agent is 0.1-0.2 parts and the weight component of water is 28-32 parts.

[0092] The weight component of water is 28-32 parts, which is determined by the physical properties of hemihydrate phosphogypsum under semi-dry conditions. In this embodiment, the weight component of dihydrate phosphogypsum powder accounts for 8%-10% of the weight component of building phosphogypsum powder. The use of dihydrate phosphogypsum powder can fully promote the growth and development of crystal nuclei during the hydration process of building phosphogypsum powder; the weight component of the hydration regulating auxiliary agent accounts for 0.1%-0.2% of the weight component of the building phosphogypsum powder. Compared with the addition of a large amount of modifiers in the prior art, this embodiment uses a hydration regulating auxiliary agent to interact with the dihydrate phosphogypsum powder, and the water in the hydration regulating auxiliary agent is formed into several granular reservoirs to hydrate the dihydrate phosphogypsum powder. The two then act together on the building phosphogypsum powder, which not only reduces the amount of hydration regulating auxiliary agent added, but also ensures the utilization rate and filling rate of the building phosphogypsum powder in the β-hemihydrate phosphogypsum generated by the dihydrate phosphogypsum powder and the hydration regulating auxiliary agent, while reducing the cost of β-hemihydrate phosphogypsum when preparing phosphogypsum bricks.

[0093] On this basis, the present embodiment also incorporates polypropylene short fibers in the hydration space, and the polypropylene short fibers are mixed in the stirring process of the planetary multi-group stirring pieces. Therefore, when the building phosphogypsum powder, dihydrate phosphogypsum powder, hydration regulating additive and water are uniformly stirred, the polypropylene short fibers will be evenly laid in the hydrated β-semihydrate phosphogypsum, and the high pressure extrusion and pulling of the polypropylene short fibers in the β-semihydrate phosphogypsum forming process form the initial strength of the phosphogypsum brickwork, so that the polypropylene short fibers will strengthen the strength of the phosphogypsum brickwork, so that the breaking load of the phosphogypsum brickwork can generally reach about 10000N (the industry 69 standard requires more than 2000N), and the compressive strength can generally reach more than 5MPa. Even if the product is loaded and transported immediately after it is off the line, it will not be damaged due to the bumps during transportation. The problem of damage to the original phosphogypsum brickwork during transportation is fundamentally solved.

[0094] The hydration control auxiliary agent includes a dispersant and a resin, and the dispersant and the resin are prepared in a weight component ratio of 1: (2-3). In this embodiment, the resin has the function of wrapping several water molecules in the water to form granular water, and the dispersant has the function of dispersing water in the building phosphogypsum powder and the dihydrate phosphogypsum powder, and preventing the water from aggregating with the building phosphogypsum powder or the dihydrate phosphogypsum powder to react with water. At the same time, the dispersant and the resin are combined to wrap the water molecules to form a granular water reservoir, and when the granular water reservoir is in a static state, the granular water reservoir will not hydrate with the building phosphogypsum powder or the dihydrate phosphogypsum powder, and the granular water reservoir can be evenly dispersed under the action of the dispersant to prevent water from being deposited at the bottom of the hydration mixing box 1.

[0095] In addition, the dispersant and resin designed in this embodiment are formulated in a weight component ratio of 1: (2-3). In the market, the price of the resin is lower than that of the dispersant. Therefore, compared with the modifier in the prior art, this embodiment reduces the addition of the modifier, thereby reducing the cost of preparing β-hemihydrate phosphogypsum into phosphogypsum bricks; in addition, the weight component of the resin accounts for 2-3 times that of the dispersant. Therefore, the water absorption rate of the resin is greatly increased. The viscosity and viscosity of the resin are reduced by the dispersant, and the flowability of the resin is improved, so that the granular water reservoir formed by the resin-shaped water molecules can be evenly distributed on the surface of the building phosphogypsum powder and the dihydrate phosphogypsum powder, thereby improving the uniform mixing during stirring and ensuring that the hydration reaction of the β-hemihydrate phosphogypsum is thorough.

[0096] In this regard, an experimental comparison was conducted on the hydration temperature of the insulation of the hydration space. The dispersant was added alone to the building phosphogypsum powder, and three dispersant test groups with hydration temperatures of room temperature, 35°C, and 45°C were established; the resin was added alone to the building phosphogypsum powder, and three resin test groups with hydration temperatures of room temperature, 35°C, and 45°C were established.

[0097] Through experimental comparison, it was found that at different hydration temperatures, there were certain differences in the morphology and structure of the hydration products. The dihydrate gypsum crystals generated by the building phosphogypsum powder added with dispersant at a hydration temperature of 35°C were more slender and the crystals were more tightly connected than those at a hydration temperature of 45°C; the structure generated by the addition of resin at a hydration temperature of 35°C was denser than that at a hydration temperature of 45°C. The crystal size of the hydration product relative to room temperature is shorter. Combined with the strength performance, it can be seen that when the crystal size and morphology of the hydrated dihydrate gypsum change, there are differences in its degree of hydration at the same hydration time. Therefore, in this embodiment, the dispersant and resin are carried out at an insulating hydration temperature of 35°C.

[0098] Therefore, after the addition of hydration control additives and the use of hydration heat of building phosphogypsum powder and dihydrate phosphogypsum powder, the moisture content of the phosphogypsum block products produced is reduced to below 20%, and the hardening molding time is only about 23 seconds. The hydration of β-hemihydrate phosphogypsum is precisely controlled from the addition of water to the molding and demolding stage, ensuring the stable quality and performance of the molded blocks.

[0099] See attached Figure 1 As shown, the hydration stirring mechanism in this embodiment includes a hydration stirring box 1 with a hydration space formed, and a plurality of anti-sticking plates 21 are embedded in the inner wall of the hydration stirring box 1. In this embodiment, the anti-sticking plates 21 are made of polytetrafluoroethylene material, and the plurality of anti-sticking plates 21 are arranged on the inner wall of the hydration stirring box 1 in a surrounding and uniform manner. The plurality of anti-sticking plates 21 are embedded in the inner bottom surface of the hydration stirring box 1, and the plurality of anti-sticking plates 21 are spread all over the inner bottom surface of the hydration stirring box 1, and there are gaps between adjacent anti-sticking plates 21.

[0100] In the prior art, the production of phosphogypsum bricks is prone to the following technical problems during the high-speed shear mixing process: since the construction phosphogypsum powder is hydrated when it comes into contact with water, the construction phosphogypsum powder is easily bonded and agglomerated with the inner wall of the hydration mixing box 1 after hydration, resulting in blockage of the output port of the hydration mixing box 1, which cannot be unblocked without special tools, seriously affecting continuous operation.

[0101] Therefore, in order to solve the above technical problems, the present embodiment adopts several anti-sticking plates 21 made of polytetrafluoroethylene material to lay the inner wall and inner bottom surface of the hydration mixing box 1, wherein a part of the anti-sticking plates 21 is arranged in a surrounding manner and evenly on the inner wall of the hydration mixing box 1, thereby reducing the adhesion and agglomeration of the building phosphogypsum powder on the inner wall of the hydration mixing box 1 after hydration, while the other part of the anti-sticking plates 21 is arranged on the inner bottom surface of the hydration mixing box 1. Since polytetrafluoroethylene has the characteristics of non-stickiness and friction resistance, the adhesion and agglomeration of the building phosphogypsum powder after hydration is avoided and attached to the inner bottom surface of the hydration mixing box 1, thereby reducing the excessive resistance of the planetary multi-group stirring parts during the stirring process and extending the service life of the planetary multi-group stirring parts. At the same time, the several anti-sticking plates 21 can reduce the adhesion and agglomeration of the building phosphogypsum powder after hydration, thereby reducing the blockage of the hydration mixing box 1, enabling continuous operation and reducing the number of maintenance times.

[0102] In addition, the gaps between several adjacent anti-sticking plates 21 in this embodiment have two functions: the first function is to provide space for the thermal expansion and contraction of the anti-sticking plates 21, so that the expansion of the anti-sticking plates 21 due to the heat generated after the construction phosphogypsum powder is hydrated will not squeeze the adjacent anti-sticking plates 21, thereby avoiding the phenomenon that the surrounding sides of the anti-sticking plates 21 bulge after being subjected to force, resulting in gaps on the surrounding sides of the anti-sticking plates 21, causing the steam generated after the construction phosphogypsum powder is hydrated to enter the space between the anti-sticking plates 21 and the inner wall of the hydration mixing box 1 through the gaps, not only damaging the hydration mixing box 1, but also affecting the stirring operation of the planetary multi-group stirring parts, making the construction phosphogypsum powder not completely hydrated, thereby affecting the stability of the hydration of the construction phosphogypsum powder in the hydration space.

[0103] The second function is to provide an insulating environment for the hydration space. When the building phosphogypsum powder is put into the hydration space and subjected to high-speed shear stirring in the hydration space, part of the building phosphogypsum powder will accumulate in the gap between adjacent anti-sticking plates 21. The heat generated during the hydration of the building phosphogypsum powder in the gap will be released into the hydration space, thereby ensuring that the hydration space is in a relatively stable temperature environment, thereby providing a stable environment for the hydration of the building phosphogypsum powder.

[0104] In addition, see Figure 1 As shown, in this embodiment, the planetary multi-group stirring element includes a planetary frame 8 which is arranged on the top of the hydration mixing box 1 and rotates. The planetary frame 8 is arranged in the box cover 2 on the top of the hydration mixing box 1. At the same time, a servo motor 7 is arranged on the top of the box cover 2. The output shaft of the servo motor 7 is fixedly connected to the planetary frame 8. In addition, a pressure relief pipe 9 extending into the hydration space is provided on the box cover 2. The pressure in the hydration space is ensured by the pressure relief pipe 9, thereby ensuring the stability of the hydration of the building phosphogypsum powder.

[0105] The planetary frame 8 extends toward the hydration space in the hydration mixing box 1 and is provided with a first stirring group, a second stirring group and a third stirring group. The first stirring group and the third stirring group have the function of self-rotation. The second stirring group extends toward the inner wall of the hydration mixing box 1, and the second stirring group can scrape off the lumps of building phosphogypsum powder attached to the inner wall of the hydration mixing box 1 after hydration.

[0106] In the present embodiment, when the planetary frame 8 rotates, it drives the first stirring group, the second stirring group and the third stirring group in the hydration stirring box 1 to synchronously revolve around the center point of the hydration stirring box 1 at the same time (the hydration stirring box 1 in the present embodiment adopts the existing planetary mixer, and the structure of the planetary mixer and the connection method of each part are the existing technology, which will not be repeated here). The first stirring group and the third stirring group rotate at high speed, so that the construction phosphogypsum powder and the dihydrate phosphogypsum powder are subjected to strong shearing and kneading effects, so as to achieve the purpose of sufficient dispersion and mixing; in addition, when the second stirring group on the planetary frame 8 rotates with the planetary frame 8, it continuously scrapes the hydrated lumps of the construction phosphogypsum powder attached to the inner wall of the hydration stirring box 1, thereby scraping off the lumps from the inner wall of the hydration stirring box 1, so that there is no retained material on the inner wall of the hydration stirring box 1, thereby improving the mixing effect.

[0107] More specifically, the first stirring group includes a first rotating body matched with the planetary frame 8, the first rotating body has a first stirring shaft 10 extending toward the hydration space, the end of the first stirring shaft 10 is fixed to the middle of a rotating rod 11, the central axis of the rotating rod 11 is perpendicular to the central axis of the first stirring shaft 10, both ends of the rotating rod 11 respectively extend toward the hydration space with first stirring rods 12, and the end of the first stirring rod 12 is fixed with a stirring shovel 14 for shoveling and stirring the building phosphogypsum powder and dihydrate phosphogypsum powder;

[0108] The third stirring group includes a second rotating body matched with the planetary frame 8, and the second rotating body has a third stirring shaft 18 extending toward the hydration space. The end of the third stirring shaft 18 is connected to several layers of fan blade assemblies arranged along the height direction of the hydration stirring box 1, and the fan blade assembly is used for spirally stirring the building phosphogypsum powder and dihydrate phosphogypsum powder.

[0109] In this embodiment, the first stirring group and the third stirring group are driven by the planetary frame 8 to revolve around the center line of the hydration stirring box 1 to perform rough stirring of the building phosphogypsum powder, dihydrate phosphogypsum powder, hydration regulating additive and water; in order to achieve precision stirring, the first stirring shaft 10 is driven to rotate by the first rotating body, and the third stirring shaft 18 is driven to rotate by the second rotating body (the hydration stirring box 1 of this embodiment adopts the existing planetary mixer, and the structure of the planetary mixer and the connection method of each part are the existing technology, which will not be repeated here), so that the first stirring shaft 10 drives the rotating rod 11 to rotate along the horizontal The two ends of the rotating rod 11 respectively drive the first stirring rod 12 to rotate, so that the stirring shovel 14 at the end of the first stirring rod 12 can stir the local phosphogypsum powder and dihydrate phosphogypsum powder; at the same time, during the rotation of the third stirring shaft 18, several layers of fan blade assemblies arranged along the height direction of the hydration stirring box 1 are driven to stir the local phosphogypsum powder and dihydrate phosphogypsum in a spiral manner, thereby improving the mixing uniformity of the phosphogypsum powder and dihydrate phosphogypsum in a local stirring manner and improving the thorough hydration of the phosphogypsum powder and dihydrate phosphogypsum.

[0110] In this embodiment, the fan blade assembly includes a rotating sleeve 19, the top and bottom of the rotating sleeve 19 both have a snap-on connection structure, and stirring blades 20 extend outwardly from both sides of the rotating sleeve 19, and the central axis of the stirring blades 20 is perpendicular to the central axis of the rotating sleeve 19. Therefore, in this embodiment, the fan blade assemblies adjacent in the height direction are fixedly connected by the snap-on connection structures at the top and bottom of the rotating sleeve 19, and the overall connection stability is improved by the snap-on connection structure. At the same time, according to the mixing amount of the building phosphogypsum powder and the dihydrate phosphogypsum, the number of layers of the fan blade assembly can be adjusted in real time by the snap-on connection structure.

[0111] In addition, the stirring blades 20 arranged on both sides of the rotating sleeve 19 stir the construction phosphogypsum powder and dihydrate phosphogypsum powder at local height positions in real time during the rotation process. The stirring blades 20 on several layers of the rotating sleeve 19 can stir the local deposition of the construction phosphogypsum powder and dihydrate phosphogypsum powder deposited in the hydration mixing box 1, thereby preventing the construction phosphogypsum powder and dihydrate phosphogypsum from being deposited at the bottom of the hydration mixing box 1.

[0112] More specifically, the second stirring group includes a second stirring shaft 15 connected to the planetary carrier 8, and a tilting rod 16 extending toward the hydration space is fixed at the end of the second stirring shaft 15. The tilting rod 16 is inclined, and a scraper plate 17 close to the inner wall of the hydration stirring box 1 is fixed at the end of the tilting rod 16. The scraper plate 17 is made of polytetrafluoroethylene, and there is a 3mm space between the end surface of the scraper plate 17 and the inner wall of the hydration stirring box 1.

[0113] The technology for connecting the second stirring shaft 15 and the planetary frame 8 in the second stirring group of this embodiment is the technology of the planetary mixer (the structure of the planetary mixer and the connection method of each part are existing technologies and will not be repeated here). The scraper plate 17 is fixed in position close to the inner wall of the hydration stirring box 1 by the tilting rod 16 connected to the second stirring shaft 15. At the same time, the scraper plate 17 is made of polytetrafluoroethylene. Since polytetrafluoroethylene has the minimum surface tension, the characteristics of not adhering to any substance, and the characteristics of low friction coefficient, the scraper plate 17 has the characteristics of non-adhesion and friction resistance, thereby extending the service life of the scraper plate 17 and reducing the maintenance frequency and maintenance cost of the hydration stirring box 1.

[0114] When the scraper plate 17 revolves with the planetary carrier 8, there is a space between the end surface of the scraper plate 17 and the inner wall of the hydration mixing box 1, so that the end surface of the scraper plate 17 will not directly contact the inner wall of the hydration mixing box 1. Therefore, the space can ensure that the scraper plate 17 can scrape off the lumps of building phosphogypsum powder on the inner wall of the hydration mixing box 1 after hydration, and avoid scratching the inner wall surface of the hydration mixing box 1. At the same time, the space can provide the inner wall of the hydration mixing box 1 with a deformation space due to thermal expansion and contraction at a certain temperature.

[0115] See also Figure 2 and Figure 3 As shown, the liquid material metering mechanism in this embodiment includes a water metering tank 13 for metering the hydration regulating aid and water, and a water supply ring pipe 23 in an annular structure arranged in the hydration stirring tank 1. The water supply ring pipe 23 is connected with a water inlet pipe and several water delivery pipes 24. The other end of the water inlet pipe is connected with the water metering tank 13. The water metering tank 13 inputs the liquid formed by the mixture of the hydration regulating aid and water into the water inlet pipe.

[0116] Several water pipes 24 are evenly distributed along the annular path of the water supply ring pipe 23, and the other end of each water pipe 24 is connected to the middle of the main shaft sleeve 25. The central axis of the main shaft sleeve 25 is perpendicular to the central axis of the water pipe 24. The two ends of the main shaft sleeve 25 are rotatably connected to the first connecting pipes 26, and the two opposite pipe openings of the first connecting pipes 26 are respectively connected to the secondary shaft sleeve 29. The other end of each secondary shaft sleeve 29 is rotatably connected to the second connecting pipe 27, and the end of the second connecting pipe 27 away from the secondary shaft sleeve 29 is connected to the side shaft sleeve 28. The side shaft sleeve 28, the secondary shaft sleeve 29 and the main shaft sleeve 25 are respectively connected to the injection pipe 30, and the end of the injection pipe 30 is rotatably connected to a spiral injection nozzle 31.

[0117] In this embodiment, the water metering tank 13 is used to mix the hydration regulating agent and water by weight components. When the water metering tank 13 has completed the mixing of the hydration regulating agent and water to form a liquid, the water metering tank 13 inputs the liquid into the water inlet pipe, and the water inlet pipe inputs the liquid into the water supply ring pipe 23. Since the water supply ring pipe 23 is an annular structure, the liquid flows along an annular path, and is sprayed into the hydration space through the spiral injection nozzle 31 of the injection pipe 30 through several water delivery pipes 24 on the water supply ring pipe 23.

[0118] During this process, the liquid after the hydration regulating agent and water are prepared is evenly mixed in the process of passing through the water inlet pipe and the water supply ring pipe 23, and the spirally flowing liquid is sprayed out through the spiral injection nozzle 31, which generates a spiral high-pressure flow mechanical force on the construction phosphogypsum powder and dihydrate phosphogypsum powder, mixes with the construction phosphogypsum powder and dihydrate phosphogypsum powder and is thoroughly and evenly hydrated under the action of the stirring mechanical force; at the same time, this embodiment utilizes the rotation performance of the side sleeve 28, the secondary sleeve 29 and the main sleeve 25 to change the direction of the injection pipe 30 connected to the side sleeve 28, the secondary sleeve 29 and the main sleeve 25, and according to the use requirements, the injection pipe 30 at each position is rotated to change the injection direction of the injection pipe 30.

[0119] The injection pipes 30 in this embodiment can be distributed at an angle of 45 degrees to each other at the same latitude, and arranged at 15, 30, 45, and 60 degrees in the longitude direction. They can not only spray water but also prevent the building gypsum from being blocked after solidifying in water. For example, when a small amount of building phosphogypsum powder or hydrated phosphogypsum dihydrate powder is accumulated on the inner wall of the hydration mixing box 1, the injection pipe 30 close to the hydration lumps is rotated so that the high-pressure liquid sprayed by the spiral injection nozzle 31 on the injection pipe 30 impacts the lumps, and combined with the scraper plate 17, the lumps on the inner wall of the hydration mixing box 1 fall into the hydration space to form β-hemihydrate phosphogypsum; in addition, the injection pipe 30 can also spray liquid at high pressure toward the scraper plate 17, the mixing shovel 14, the mixing blade 20 and other components in the planetary multi-group mixing parts.

[0120] Alternatively, in order to reflect the hydration effect of the building phosphogypsum powder and the dihydrate phosphogypsum powder, the spiral injection nozzles 31 on several injection pipes 30 can all be directed toward the feeding path of the building phosphogypsum powder and the dihydrate phosphogypsum falling into the hydration space. The impact force formed by the building phosphogypsum powder and the dihydrate phosphogypsum powder falling downward due to gravity coincides with the high-pressure liquid impact force of all the spiral injection nozzles 31, and an initial high shear force is generated between the two, so that the liquid and the building phosphogypsum powder and the dihydrate phosphogypsum powder are fully and evenly mixed, and the building phosphogypsum powder and the dihydrate phosphogypsum powder can also be completely hydrated.

[0121] See also Figure 1As shown, the dry material metering mechanism in this embodiment includes a feed frame 3 arranged on one side of a hydration mixing box 1, a metering hopper 4 for metering building phosphogypsum powder and dihydrate phosphogypsum powder is installed in the feed frame 3, and two spiral conveying pipes 5 arranged in the height direction are arranged on the top of the metering hopper 4, one of the spiral conveying pipes 5 is used to convey the building phosphogypsum powder, and the other spiral conveying pipe 5 is used to convey the dihydrate phosphogypsum powder, and the two spiral conveying pipes 5 are connected to the sides of the metering hopper 4 respectively with feed pipes 6 for conveying the building phosphogypsum powder or dihydrate phosphogypsum powder into the metering hopper 4, and the bottom of the metering hopper 4 has a pipeline connected to the feed port of the hydration mixing box 1.

[0122] This embodiment adopts a metering hopper 4 to weigh and measure the construction phosphogypsum powder or dihydrate phosphogypsum powder paste transported by the spiral conveying pipe 5. When the weight is met, the conveying of the spiral conveying pipe 5 is stopped, thereby ensuring the weight composition of the construction phosphogypsum powder and dihydrate phosphogypsum powder.

[0123] See also Figure 4 As shown, the control method of the semi-dry phosphogypsum bricklaying hydration control equipment is applied to the semi-dry phosphogypsum bricklaying hydration control equipment, comprising the following steps:

[0124] Step 1, dry material control and metering: conveying construction phosphogypsum powder into the metering hopper 4 through the spiral conveying pipe 5, measuring the weight component of the construction phosphogypsum powder in the metering hopper 4 to be 100 parts, and adding it into the hydration mixing box 1 through the metering hopper 4; conveying dihydrate phosphogypsum powder into the metering hopper 4 through another spiral conveying pipe 5, measuring the weight component of the dihydrate phosphogypsum powder in the metering hopper 4 to be 8-10 parts, and adding it into the hydration mixing box 1 through the metering hopper 4;

[0125] Step 2: Liquid material control and metering: 0.1-0.2 parts by weight of hydration control agent and 28-32 parts by weight of water are metered through the water metering tank 13. The hydration control agent and water are mixed in the water metering tank 13 to form liquid, and the high-pressure liquid is sprayed toward the spraying pipes 30 at various positions of the hydration mixing tank 1 through the water supply ring pipe 23;

[0126] Step 3, initial hydration regulation: The high-pressure flow mechanical force formed by the directional injection of the high-pressure liquid by the injection pipe 30 in step 2 is used to impact the building phosphogypsum powder or the dihydrate phosphogypsum powder in step 3 at a high speed to generate an initial high shear force and act on the building phosphogypsum powder and the dihydrate phosphogypsum powder to form an initial uniform mixture. At the same time, the hydration and condensation characteristics of the dihydrate phosphogypsum powder and the building phosphogypsum powder complement each other, and the hydration rate of the building phosphogypsum powder is accurately regulated by the addition amount of the two weight components, thereby adjusting the initial setting time of the β-hemihydrate phosphogypsum to control the initial setting time to 4 minutes. + 30S;

[0127] Step 4, hydration characteristic regulation: using the liquid formed by mixing the hydration regulating agent and water in step 3, during the process of conveying to the injection pipe 30, the hydration regulating agent wraps several water molecules in the water to form a granular water reservoir. When the liquid impacts the building phosphogypsum powder or dihydrate phosphogypsum powder at a high speed, the granular water reservoir disperses the water and the building phosphogypsum powder or dihydrate phosphogypsum powder under the action of the hydration regulating agent, accurately regulates the hydration time of the building phosphogypsum powder and dihydrate phosphogypsum powder, and acts on the hydration speed of the building phosphogypsum powder in step 3, so that the hydration reaction of the β-hemihydrate phosphogypsum is thorough;

[0128] Step 5, stirring speed control and regulation: through the planetary multi-group stirring parts with single power input and multiple output, the stirring shovel 14, the stirring blade 20 and the scraper plate 17 form different speed and different direction stirring, and at the same time, combined with the space between the scraper plate 17 and the anti-sticking plate 21 embedded in the inner wall of the hydration stirring box 1, the stirring shovel 14, the stirring blade 20 and the scraper plate 17 form a high-speed shear force of 165-260 revolutions per minute at 45S. During the stirring process, 0.05-0.1 parts by weight of polypropylene short fibers are added into the hydration stirring box 1 to quickly promote the thorough hydration reaction between the building phosphogypsum powder, dihydrate phosphogypsum powder, hydration control additive and water in step 4, so that the β-hemihydrate phosphogypsum has a certain fluidity.

[0129] This embodiment uses dihydrate phosphogypsum powder to promote the growth and development of dihydrate phosphogypsum crystal nuclei formed by building phosphogypsum powder, thereby accelerating the hydration rate of building phosphogypsum powder. While promoting the hydration rate of building phosphogypsum powder, the insoluble substances generated by phosphogypsum itself in turn inhibit the hydration rate of building phosphogypsum powder. Combined with the formation of the granular reservoir of the hydration regulating auxiliary agent and the characteristics of the uniformly dispersed granular reservoir, the hydration time of building phosphogypsum powder can be controlled, thereby overcoming the instability of inconsistent quality of building phosphogypsum powder. In addition, during the stirring process of high-speed shear force, the rapid and uniform mixing reaction of building phosphogypsum powder is accelerated, the phenomenon of incomplete hydration of building phosphogypsum powder is reduced, and agglomeration and blockage are also avoided.

[0130] This embodiment can significantly reduce water consumption by controlling the ratio of building phosphogypsum powder, dihydrate phosphogypsum powder and water consumption. The water consumption in this embodiment is only 28%-32% of the building phosphogypsum powder, which is 68%-72% less than the water consumption of traditional flat mold manual casting production and vertical mold hydraulic jacking mechanized production method. Reducing water consumption can save water resources, reduce production costs, and improve production efficiency.

[0131] In addition, the hydration stirring mechanism in this embodiment adopts a 1000-type planetary mixer. Based on the 1000-type planetary mixer, the planetary multi-group stirring elements are improved, and the structure of the hydration stirring box 1 is improved. In this way, while ensuring high shear force, it can also save more than 120,000 yuan / unit of equipment manufacturing supporting investment and save the production cost of block products, which can make each m 3 Phosphogypsum block products save a few yuan in electricity costs.

[0132] At the same time, this embodiment can also recycle waste block products. In the production of hollow phosphogypsum blocks of this achievement technology, a maximum of 8-10 parts by weight of dihydrate phosphogypsum (crushed material of waste block products) can be added to the building phosphogypsum powder, and the flexural and compressive strengths of the products can be ensured to be much higher than the industry standard requirements. The resource utilization of waste blocks generated during production sites, factory areas, product transportation, and construction and use can be realized, which saves raw material costs and is environmentally friendly. The production of original block products basically cannot recycle waste products.

[0133] The above are only embodiments of the present invention, and the common knowledge such as the known specific technical solutions and / or characteristics in the solution are not described in detail here. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the technical solution of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. Semi-dry phosphogypsum bricklaying hydration control equipment, including: The hydration stirring mechanism is configured as a hydration space with heat preservation and pressure maintenance, wherein the hydration space is provided with a planetary multi-group stirring element with multi-path high-speed timing stirring, and the building phosphogypsum powder, dihydrate phosphogypsum powder, hydration regulating aid and water are intermittently added into the hydration space synchronously or asynchronously, wherein the building phosphogypsum powder is used to delay the hydration reaction time of the dihydrate phosphogypsum powder and allow the two to have sufficient time to be fully stirred with water, wherein the dihydrate phosphogypsum powder is used to accelerate the hydration speed of the building phosphogypsum powder, and the hydration regulating aid The agent is used to initially separate water molecules from building phosphogypsum powder and dihydrate phosphogypsum powder, and wrap several water molecules in the water to form a granular water reservoir. Driven by the planetary multi-group stirring pieces, several granular water reservoirs are dispersed in the building phosphogypsum powder environment and attached to the surface of phosphogypsum particles and dihydrate phosphogypsum powder. The planetary multi-group stirring pieces exert stirring force on the building phosphogypsum powder, dihydrate phosphogypsum powder, hydration regulating additive and water, forcing the granular water reservoir to gradually fully hydrate the building phosphogypsum powder and dihydrate phosphogypsum powder. A dry material metering mechanism is configured to measure and weigh the building phosphogypsum powder and dihydrate phosphogypsum powder, and to transport them vertically downward into the hydration space in a quantitative manner; The liquid material metering mechanism is configured to measure and weigh water and hydration regulating aids so as to spray them quantitatively upward or downward into the hydration space.

2. The semi-dry phosphogypsum bricklaying hydration control device according to claim 1, characterized in that: The hydration space is also mixed with polypropylene short fibers, wherein the weight component of the building phosphogypsum powder is 100 parts, the weight component of the dihydrate phosphogypsum powder is 8-10 parts, the weight component of the polypropylene short fibers is 0.05-0.1 parts, the weight component of the hydration regulating auxiliary agent is 0.1-0.2 parts, and the weight component of the water is 28-32 parts.

3. The semi-dry phosphogypsum bricklaying hydration control device according to claim 2 is characterized in that: The hydration control auxiliary agent includes a dispersant and a resin, and the dispersant and the resin are prepared in a weight ratio of 1:(2-3).

4. The semi-dry phosphogypsum bricklaying hydration control device according to claim 1, characterized in that: The hydration stirring mechanism includes a hydration stirring box having a hydration space, a plurality of anti-sticking plates are embedded in the inner wall of the hydration stirring box, the plurality of anti-sticking plates are arranged in a surrounding and uniform manner on the inner wall of the hydration stirring box, a plurality of anti-sticking plates are embedded in the inner bottom surface of the hydration stirring box, the plurality of anti-sticking plates are spread all over the inner bottom surface of the hydration stirring box, and there are gaps between adjacent anti-sticking plates.

5. The semi-dry phosphogypsum brick hydration control device according to claim 4 is characterized in that: The planetary multi-group stirring element includes a planetary frame which is arranged on the top of the hydration stirring box and rotates. The planetary frame extends toward the hydration space in the hydration stirring box and is provided with a first stirring group, a second stirring group and a third stirring group. The first stirring group and the third stirring group have the function of self-rotation. The second stirring group extends toward the inner wall of the hydration stirring box, and the second stirring group can scrape off the lumps of building phosphogypsum powder attached to the inner wall of the hydration stirring box after hydration.

6. The semi-dry phosphogypsum brick hydration control device according to claim 5, characterized in that: The first stirring group includes a first rotating body matched with the planetary frame, the first rotating body has a first stirring shaft extending toward the hydration space, the end of the first stirring shaft is fixed to the middle of the rotating rod, the central axis of the rotating rod is perpendicular to the central axis of the first stirring shaft, both ends of the rotating rod respectively extend toward the hydration space with first stirring rods, and the end of the first stirring rod is fixed with a stirring shovel for shoveling and stirring the building phosphogypsum powder and dihydrate phosphogypsum powder; The third stirring group includes a second rotating body matched with the planetary frame, the second rotating body has a third stirring shaft extending toward the hydration space, the end of the third stirring shaft is connected to several layers of fan blade assemblies arranged along the height direction of the hydration stirring box, and the fan blade assembly is used to spirally stir the building phosphogypsum powder and dihydrate phosphogypsum powder.

7. The semi-dry phosphogypsum brick hydration control device according to claim 5, characterized in that: The second stirring group includes a second stirring shaft connected to the planetary frame, and a tilting rod extending toward the hydration space is fixed to the end of the second stirring shaft. The tilting rod is inclined, and a scraper plate close to the inner wall of the hydration stirring box is fixed to the end of the tilting rod. The scraper plate is made of polytetrafluoroethylene, and there is a space gap of 3 mm between the end surface of the scraper plate and the inner wall of the hydration stirring box.

8. The semi-dry phosphogypsum brick hydration control device according to claim 1, characterized in that: The liquid material metering mechanism includes a water metering tank for metering the hydration regulating aid and water, and a water supply ring pipe in an annular structure arranged in the hydration stirring tank, the water supply ring pipe is connected with a water inlet pipe and several water delivery pipes, the other end of the water inlet pipe is connected with the water metering tank, and the water metering tank inputs the liquid formed by the mixture of the hydration regulating aid and water into the water inlet pipe; The several water pipes are evenly distributed along the annular path of the water supply ring pipe, and the other end of each water pipe is connected to the middle of the main shaft sleeve. The central axis of the main shaft sleeve is perpendicular to the central axis of the water pipe. The two ends of the main shaft sleeve are respectively rotatably connected with the first connecting pipes, and the two first connecting pipes have opposite pipe openings respectively connected with the secondary shaft sleeve. The other end of each secondary shaft sleeve is rotatably connected with the second connecting pipe, and the end of the second connecting pipe away from the secondary shaft sleeve is connected with the side shaft sleeve. The side shaft sleeve, the secondary shaft sleeve and the main shaft sleeve are respectively connected with injection pipes, and the end of the injection pipe is rotatably connected with a spiral injection nozzle in a spiral shape.

9. The semi-dry phosphogypsum brick hydration control device according to claim 1, characterized in that: The dry material metering mechanism includes a feed frame arranged on one side of a hydration mixing box, a metering hopper for metering construction phosphogypsum powder and dihydrate phosphogypsum powder is installed in the feed frame, two spiral conveying pipes arranged in the height direction are arranged on the top of the metering hopper, one of the spiral conveying pipes is used to convey the construction phosphogypsum powder, and the other spiral conveying pipe is used to convey the dihydrate phosphogypsum powder, the two spiral conveying pipes are connected to the sides of the metering hopper respectively with feed pipes for conveying the construction phosphogypsum powder or dihydrate phosphogypsum powder into the metering hopper, and the bottom of the metering hopper has a pipeline connected to the feed port of the hydration mixing box.

10. A control method for a semi-dry phosphogypsum bricklaying hydration control device, applied to the semi-dry phosphogypsum bricklaying hydration control device according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1, dry material control and metering: conveying construction phosphogypsum powder into the metering hopper through a spiral conveying pipe, measuring 100 parts of construction phosphogypsum powder by weight in the metering hopper, and adding it into the hydration mixing box through the metering hopper; conveying dihydrate phosphogypsum powder into the metering hopper through another spiral conveying pipe, measuring 8-10 parts of dihydrate phosphogypsum powder by weight in the metering hopper, and adding it into the hydration mixing box through the metering hopper; Step 2: Liquid material control and metering: 0.1-0.2 parts by weight of a hydration control agent and 28-32 parts by weight of water are metered through a water meter tank. The hydration control agent and water are mixed in the water meter tank to form a liquid, and the high-pressure liquid is directed toward the injection pipes at various positions of the hydration mixing tank through a water supply ring pipe; Step 3, initial hydration regulation: utilize the high-pressure flow mechanical force formed by the directional injection of high-pressure liquid from the injection pipe in step 2 to impact the building phosphogypsum powder or dihydrate phosphogypsum powder in step 3 at a high speed to generate an initial high shear force and act on the building phosphogypsum powder and dihydrate phosphogypsum powder to form an initial uniform mixture. At the same time, the hydration and condensation characteristics of the dihydrate phosphogypsum powder and the building phosphogypsum powder complement each other, and the hydration rate of the building phosphogypsum powder is accurately regulated by the addition amount of the two weight components, thereby adjusting the initial setting time of the β-hemihydrate phosphogypsum to control the initial setting time to 4 minutes. + 30S; Step 4, regulating hydration characteristics: using the liquid formed by mixing the hydration regulating auxiliary agent and water in step 3, during the process of conveying to the injection pipe, the hydration regulating auxiliary agent wraps several water molecules in the water to form a granular water reservoir, when the liquid impacts the building phosphogypsum powder or dihydrate phosphogypsum powder at a high speed, the granular water reservoir disperses the water and the building phosphogypsum powder or dihydrate phosphogypsum powder under the action of the hydration regulating auxiliary agent, accurately regulates the hydration time of the building phosphogypsum powder and dihydrate phosphogypsum powder, and acts on the hydration speed of the building phosphogypsum powder in step 3, so that the hydration reaction of β-hemihydrate phosphogypsum is thorough; Step 5, stirring speed control and regulation: through the planetary multi-group stirring parts with single power input and multiple output, the stirring shovel, stirring blade and scraper plate form different speed and different direction stirring, and at the same time, combined with the space between the scraper plate and the anti-sticking plate embedded in the inner wall of the hydration stirring box, the stirring shovel, stirring blade and scraper plate form a high-speed shear force of 165-260 revolutions per minute at 45S. During the stirring process, 0.05-0.1 parts by weight of polypropylene short fibers are added into the hydration stirring box to quickly promote the thorough hydration reaction between the building phosphogypsum powder, dihydrate phosphogypsum powder, hydration control additive and water in step 4, so that the β-hemihydrate phosphogypsum has a certain fluidity.

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