Method for preparing lightweight building block by regenerating superfine slag powder

Abstract

The invention discloses a method for preparing a lightweight building block by regenerating superfine slag powder, which is based on a lightweight building block preparation principle, aims at the diffusion characteristic of the superfine slag powder, improves the mixing and pulping links of raw materials, and adopts a novel mode of firstly premixing independent raw materials and then gradually adding new materials for circular mixing. The design of an outer stirring structure and an inner stirring structure is matched, so that the formed mixed dry material rotates, diffuses and gathers at the bottom of the material mixing kettle from top to bottom, is lifted upwards from the material returning bin cylinder at the bottom of the material mixing kettle and then diffuses to the upper part of the material mixing kettle, and the circulation is repeated; mixed raw materials which circularly move from top to bottom and from inside to outside are sheared and diffused through a spiral shear knife and a plurality of groups of stirring shovels, so that the mixing effect of the raw materials is improved, the formation of aggregates is avoided, the slurry preparation uniformity is improved, and the preparation quality of light building blocks is improved.

Description

Technical Field

[0001] The invention relates to the technical field of building block production, and more specifically to a method for preparing lightweight building blocks by regenerating slag micropowder. Background Art

[0002] my country's annual blast furnace slag emissions are around 30 million tons, and the waste slag piled up in slag yards is about 100 million tons. These smelting waste slags stored in the open air have caused serious damage to the ecological environment. In recent years, my country has begun to accelerate the recycling of waste slag. Among them, the use of slag material recycling to prepare lightweight blocks is a process of resource recycling and environmental protection and energy saving.

[0003] However, slag powder is not easy to disperse. If it is directly mixed with all raw materials, the slag powder will easily gather together to form small agglomerates. These agglomerates will make the slag powder unevenly distributed in the mixture. For example, in the subsequent mixing process, these agglomerates may not be completely broken up, resulting in excessive slag powder content in some parts of the lightweight blocks, while other parts have insufficient content. As a result, when water is added and mixed subsequently, when the mixing is insufficient, the slag powder may not be able to fully react with the hydration products of cement, because substances such as calcium hydroxide produced by cement hydration need to come into contact with the slag powder to stimulate its activity. When the ordinary stirring blade structure is used to cause uneven mixing, this insufficient contact will also occur, thereby affecting the contribution of the slag powder to the strength of the lightweight blocks. Summary of the invention

[0004] The purpose of the present invention is to solve the practical problems in the prior art. According to the diffusion characteristics of slag powder, the mixing and pulping of raw materials are improved to improve the uniformity of mixing slag powder with other raw materials, thereby improving the production quality of lightweight building blocks, and providing a method for preparing lightweight building blocks by regenerating slag powder.

[0005] The purpose of the present invention can be achieved by the following technical solution: A method for preparing lightweight building blocks by regenerating slag micropowder, comprising the following steps:

[0006] S1. Prepare materials: prepare raw materials according to the following weight parts: 30-40 parts of slag powder, 40-50 parts of building aggregate, 15-30 parts of slag silicate cement, and 10-25 parts of additives, wherein the additives include 8-15 parts of reinforcing agent, 5-8 parts of surfactant, and 3-5 parts of water reducing agent;

[0007] S2, slag powder pretreatment;

[0008] S3, premix: building aggregate, slag silicate cement, reinforcing agent, and water reducing agent are added to a mixing kettle, and premixed by using an external stirring structure and an internal stirring structure to obtain a mixture 1, and slag powder and surfactant are added to a mixing tank for premixing to obtain a mixture 2;

[0009] S4, secondary mixing: The mixing tank is driven to rotate in a circle by an annular electric guide rail, and the second mixing material is gradually put into the mixing kettle in small amounts through the feeding assembly. After the second mixing material contacts the first mixing material, it diffuses downward along the four sides under the rotation of multiple groups of mixing shovels, and then is driven by the rotating spiral shear knife to the upper part of the return silo and diffuses outward to mix with the newly added second mixing material. This cycle is repeated to obtain a uniformly mixed dry material.

[0010] S5. Slurry preparation: adding aqueous solution into the mixing kettle, and continuously stirring the mixed dry materials by using the cooperation of the external stirring structure and the internal stirring structure to obtain slurry;

[0011] S6. Forming and curing: pour the slurry into a mold for casting and forming. After forming, let it stand for 2-4 hours to obtain a lightweight block sample. Then, send it into a steam curing kettle, pass steam for high temperature and high pressure curing, and obtain a lightweight block.

[0012] Furthermore, in S2, the slag powder is crushed to a particle size of 0.1-0.17 mm, and magnetic separation and acid washing processes are successively performed to remove impurities, and then the slag powder is crushed to a particle size of 0.03-0.72 mm.

[0013] Furthermore, the mixing kettle is fixedly mounted on the support frame, the annular electric guide rail is fixedly mounted on the top of the support frame and is arranged coaxially with the mixing kettle, and the stirring tank is driven by the annular electric guide rail and rotates in a circle along the axis of the mixing kettle.

[0014] Furthermore, the return silo is fixedly installed in the center of the mixing kettle, the bottom end wall of the return silo is provided with multiple lower feed ports connected to the bottom of the mixing kettle, and the top end wall of the return silo is provided with multiple upper discharge ports inclined downward.

[0015] Furthermore, the external stirring structure includes a rotating ring that is rotationally driven and installed on the upper and lower inner walls of the mixing kettle. A plurality of wall-attached scrapers that are arranged in contact with the inner wall of the mixing kettle are distributed in an annular manner between a pair of rotating rings, and two stirring shovels distributed up and down are provided on the inner side of each wall-attached scraper.

[0016] Furthermore, the internal stirring structure includes a rotating shaft rotatably installed in the center of the return silo barrel and a spiral shearing knife sleeved thereon. The upper end of the rotating shaft passes through the top of the return silo barrel and is fixedly connected to the wall scraper at the corresponding position through multiple armatures.

[0017] Furthermore, the material feeding assembly includes a conveying pipe fixedly connected to the discharge port at the bottom end of the mixing tank, a spiral material feeding plate is rotatably installed inside the conveying pipe, a plurality of material discharge grooves are opened inside the conveying pipe, and a sealing ring plate for preliminary sealing is rotatably installed on the conveying pipe.

[0018] Furthermore, a fixed sleeve is fixedly installed on the end of the conveying pipe away from the stirring tank, and a micro-annular guide rail located on the outside of the end of the conveying pipe is fixedly embedded in the fixed sleeve. The end of the sealing ring is fixed on the micro-annular guide rail and is driven to rotate along the axis of the conveying pipe.

[0019] Compared with the prior art, the advantages of the present invention are:

[0020] (1) This scheme aims at improving the mixing and slurrying process of raw materials based on the diffusion characteristics of slag powder. It adopts a new mode of pre-mixing raw materials separately and then adding new materials in succession for cyclic mixing. It is equipped with the design of external stirring structure and internal stirring structure, so that the formed mixed dry materials rotate and diffuse from top to bottom and gather at the bottom of the mixing kettle, and then move upward from the return silo at the bottom of the mixing kettle and diffuse to the top of the mixing kettle, and repeat this cycle. The spiral shearing knife and multiple groups of stirring shovels are used to shear and diffuse the mixed dry materials circulating from top to bottom and from inside to outside, so as to improve the mixing effect between raw materials, avoid the formation of agglomerates in the subsequent water adding and stirring process, and improve the uniformity of slurry preparation.

[0021] (2) The new mixing mode is as follows: first, other easily dispersible raw materials except slag powder are mixed to form a uniform mixture 1; then, the mixture 2 consisting of slag powder and surface modifier is diffused into the mixing kettle through a rotating conveying component. The process is continuous feeding and intermittent spreading of materials to achieve the diffusion of mixture 2 into mixture 1 in batches in small quantities; and a rotating stirring shovel and a spiral shearing knife are used to promote the shear diffusion of the mixed dry materials from top to bottom and from bottom to top, thereby effectively improving the mixing degree between the slag powder and other raw materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a process flow chart of the present invention;

[0023] Figure 2 It is a schematic diagram of the overall structure of the junction of the mixing kettle and the stirring tank involved in the present invention;

[0024] Figure 3 is a cross-sectional view of a mixing kettle of the present invention;

[0025] Figure 4 It is a structural schematic diagram of the junction of the return material silo and the external stirring structure of the present invention;

[0026] Figure 5 It is a cross-sectional view of the junction between the return material silo and the internal stirring part of the present invention;

[0027] Figure 6 It is a structural schematic diagram of the joint between the stirring tank and the feeding assembly of the present invention;

[0028] Figure 7 It is a disassembled diagram of the material feeding component of the present invention;

[0029] Figure 8 A cross-sectional view of a material delivery assembly of the present invention;

[0030] Fig. 9 It is a cross-sectional view of the device of the present invention during the mixing and pulping process.

[0031] Description of the numbers in the figure:

[0032] 1. Mixing kettle; 2. Stirring tank; 3. Feeding assembly; 31. Delivery pipe; 311. Dropping notch; 32. Micro annular guide rail; 33. Sealing ring; 34. Spiral feeding plate; 4. Annular electric guide rail; 5. Return silo; 501. Lower feed port; 502. Upper discharge port; 6. Wall scraper; 7. Rotating ring; 8. Stirring shovel; 9. Arm; 10. Rotating shaft; 11. Spiral shearing knife; 12. Micro air pump; 13. Air nozzle; 14. Annular water supply pipe. DETAILED DESCRIPTION

[0033] The following will combine the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all the embodiments. All other embodiments obtained by ordinary technicians in this field without creative work based on the embodiments of the present invention belong to the scope of protection of the present invention.

[0034] Embodiment 1: The present invention aims at the diffusion characteristics of slag powder, based on the principle of lightweight block preparation, improves the mixing and pulping of raw materials to improve the uniformity of mixing slag powder with other raw materials, and proposes the following technical solutions:

[0035] The present invention discloses a method for preparing lightweight building blocks by regenerating slag micropowder. Figure 1 , including the following steps:

[0036] S1. Prepare materials: prepare raw materials according to the following weight parts: 30-40 parts of slag powder, 40-50 parts of building aggregate, 15-30 parts of slag silicate cement, and 10-25 parts of additives, wherein the additives include 8-15 parts of reinforcing agent, 5-8 parts of surfactant, and 3-5 parts of water reducing agent;

[0037] S2. Pretreatment of slag powder: crushing the slag powder to a particle size of 0.1-0.17 mm, performing magnetic separation and acid washing to remove impurities, and then crushing the slag powder to a particle size of 0.03-0.72 mm to improve the purity of the slag powder and effectively avoid changes in the content of other active components in the slag affecting its reaction activity with cement and other cementitious materials;

[0038] S3, Premix: Please refer to Figure 2, adding construction aggregate, slag silicate cement, reinforcing agent, and water reducing agent into a mixing kettle 1 and premixing them by using an external stirring structure and an internal stirring structure to obtain a mixture 1, and adding slag powder and a surfactant into a mixing tank 2 and premixing them to obtain a mixture 2;

[0039] S4, Secondary Mixing: Please refer to Figure 2-Figure 4 as well as Fig. 9 , the annular electric guide rail 4 is used to drive the mixing tank 2 to rotate in a circle, and the mixed material 2 is gradually put into the mixing kettle 1 through the feeding component 3 in small amounts. After the mixed material 2 contacts the mixed material 1, it diffuses downward along the four sides under the rotation of multiple groups of mixing shovels 8, and then is driven to the upper part of the return silo 5 by the rotating spiral shear knife 11, and diffuses outward from multiple upper discharge ports 502. In this process, multiple air nozzles 13 are used to spray air at the upper discharge ports 502, so that the raw materials after preliminary mixing are efficiently diffused to the outside of the return silo 5 and mixed with the newly added mixed material 2, and this cycle is repeated to obtain a uniformly mixed dry material;

[0040] S5. Slurry preparation: Please refer to Fig. 9 , using multiple water nozzles on the annular water supply pipe 14 to add aqueous solution into the mixing kettle 1, and continuously using the cooperation of the external stirring structure and the internal stirring structure to stir the mixed dry materials to obtain slurry;

[0041] S6. Forming and curing: pour the slurry into a mold for casting and forming, and let it stand for 2-4 hours after forming to obtain a lightweight block sample. The lightweight block sample is cut into required sizes and then sent to a steam curing kettle. Steam is introduced for high-temperature and high-pressure curing to obtain a lightweight block. The steam temperature is 140°C and the steam pressure is 1.25 atm.

[0042] Example 2: This example describes the preparation device involved in Example 1 in detail as follows:

[0043] See also Figure 2 , Figure 3 The mixing kettle 1 is fixedly installed on the support frame, the annular electric guide rail 4 is fixedly installed on the top of the support frame and is arranged coaxially with the mixing kettle 1, the stirring tank 2 is driven by the annular electric guide rail 4 and rotates along the axis of the mixing kettle 1, the return silo barrel 5 is fixedly installed in the center of the mixing kettle 1, and the bottom end wall of the return silo barrel 5 is provided with a plurality of lower feed ports 501 connected with the bottom of the mixing kettle 1, and the top end wall of the return silo barrel 5 is provided with a plurality of upper discharge ports 502 inclined downward.

[0044] See also Figure 4The external stirring structure includes a rotating ring 7 which is rotatably mounted on the upper and lower inner walls of the mixing kettle 1. A plurality of wall-attached scrapers 6 which are arranged in contact with the inner wall of the mixing kettle 1 are annularly distributed between a pair of rotating rings 7. Two stirring shovels 8 which are arranged in contact with the inner wall of the mixing kettle 1 are arranged on the inner side of each wall-attached scraper 6. Each group of stirring shovels 8 which are arranged adjacent to each other are staggered and arranged in an up-and-down manner. The stirring shovels 8 are arranged obliquely upward along the rotation direction of the wall-attached scraper 6. A pair of rotating rings 7 are fixedly sleeved with a gear ring on the outside. A gear meshing with the pair of gear rings is rotatably embedded and mounted on the outside of the mixing kettle 1. The gear ring is an annular structure which is fixedly sleeved on the outer ring of the rotating ring 7 and meshing with the gear. A driving motor which rotatably drives the pair of gears is installed at the bottom of the mixing kettle 1. Through the cooperation between the driving motor, the gear and the gear ring, the pair of rotating rings 7 drive the entire external stirring structure to rotate in a circle.

[0045] See also Figure 4 , Figure 5 The internal stirring structure includes a rotating shaft 10 rotatably installed in the center of the return silo tube 5 and a spiral shearing knife 11 sleeved thereon. The spiral shearing knife 11 is distributed with shearing teeth. The upper end of the rotating shaft 10 passes through the top of the return silo tube 5 and is fixedly connected to the wall scraper 6 at the corresponding position through a plurality of armature rods 9.

[0046] This scheme takes into account the possible difference between the density of slag powder and cement and aggregate. If they are directly mixed, the components with higher density may sink under the action of gravity, while the components with lower density float, resulting in stratification of the mixture. Therefore, it is proposed to adopt a new mode of pre-mixing the raw materials separately and then adding new materials in succession for cyclic mixing:

[0047] In the premixing process, building aggregate, slag silicate cement, reinforcing agent and water reducing agent are added into the mixing kettle 1, wherein the selected slag silicate cement can better adapt to the slag micropowder because it contains more slag components and can better interact with the slag micropowder. The reinforcing agent is selected from glass fiber and silicon-aluminum minerals such as nano-silicon dioxide and fly ash floating beads, wherein the glass fiber enhances the impact resistance and fatigue resistance, reduces the thermal conductivity coefficient and improves the thermal insulation stability. The addition of glass fiber in the process of preparing lightweight blocks with slag micropowder not only enhances the mechanical properties of the lightweight blocks, but also significantly improves its durability and thermal insulation performance. The addition of an appropriate amount of water reducing agent can reduce the water demand of the slurry and improve the fluidity of the slurry when water is added to prepare the slurry later. Common water reducing agents include naphthalene-based water reducing agent and polycarboxylic acid-based water reducing agent.

[0048] See also Figure 3 , Figure 4The outer stirring structure is driven by a driving motor to rotate counterclockwise, and the stirring shovel 8 is arranged upwardly along the rotation direction of the wall scraper 6. Therefore, when stirring the raw materials, multiple groups of stirring shovels 8 can not only drive the raw materials to rotate and diffuse in all directions, but also squeeze and drive the raw materials from top to bottom. The setting of multiple groups of L-shaped wall scrapers 6 is used to hang the inner wall of the mixing kettle 1 on the wall, so that the raw materials rotate from top to bottom and gather at the bottom of the mixing kettle 1, and move upward from the return silo 5 through multiple lower feed ports 501 under the drive of the rotating spiral shearing knife 11 and then diffuse to the top of the mixing kettle 1, and so on. The spiral shearing knife 11 and multiple groups of stirring shovels 8 are used to shear and diffuse the raw materials circulating up and down to obtain a uniform mixture.

[0049] At the same time, slag powder and surfactant are added into the stirring tank 2 for premixing. The stirring tank 2 is provided with a stirrer to evenly mix the mixture to obtain the second mixture. The slag powder is pretreated with a surface modifier to change its surface properties so as to facilitate the subsequent addition of water to prepare the slurry so that it can be better compatible with water and other raw materials. For example, the use of surface modifiers such as silane coupling agents can improve the surface activity of the slag powder and enhance its ability to bind with water, thereby improving the fluidity of the slurry.

[0050] In the secondary mixing process, the annular electric guide rail 4 is used to drive the mixing tank 2 to rotate in a circle, and the secondary mixing material is gradually fed into the mixing kettle 1 in small amounts through the feeding component 3;

[0051] See also Figure 6-Figure 9 The feeding assembly 3 includes a conveying pipe 31 fixedly connected to the discharge port at the bottom end of the mixing tank 2, a spiral feeding piece 34 is rotatably installed inside the conveying pipe 31, a plurality of material dropping slots 311 are opened inside the conveying pipe 31, a sealing ring piece 33 for preliminary sealing of 411 is rotatably installed on the conveying pipe 31, a fixed sleeve is fixedly installed at the end of the conveying pipe 31 away from the mixing tank 2, a micro-annular guide rail 32 located outside the end of the conveying pipe 31 is fixedly embedded in the fixed sleeve, and the end of the sealing ring piece 33 is fixed on the micro-annular guide rail 32 and is driven to rotate along the circumference of the axis of the conveying pipe 31;

[0052] Specifically, the material discharge valve at the bottom of the mixing tank 2 is opened, the mixed material 2 enters the feeding assembly 3, and the mixed material 2 is transported to the end of the feeding assembly 3 by the rotation of the spiral feeding piece 34, and the micro-annular guide rail 32 is opened and closed at a preset time interval, and the micro-annular guide rail 32 drives the sealing ring piece 33 to rotate 180° upward to expose the material discharge slot 311 below. At this time, the mixed material 2 in the feeding assembly 3 falls evenly from the multiple material discharge slots 311 into the mixing kettle 1;

[0053] In this process, the annular electric guide rail 4 drives the stirring tank 2 to rotate in a circle, so that the mixed material 2 in the feeding component 3 is evenly diffused into the mixing kettle 1, and the micro-annular guide rail 32 is opened and closed at a preset time, so that the sealing ring piece 33 is reset to the bottom of the conveying pipe 31. At this time, the drop slot 311 is temporarily blocked. In this process, the spiral feeding piece 34 is used to continuously feed the mixed material 2 into the feeding component 3. This cycle is repeated to achieve continuous feeding and intermittent spreading, and effectively diffuse the mixed material 2 into the mixed material 1 in small quantities, which can avoid local accumulation of slag powder and uneven mixing. At the same time, batch addition can also enable the slag powder to interact better with other raw materials.

[0054] During the secondary mixing process, the external stirring structure and the internal stirring structure are continuously provided, so that the mixed dry materials are rotated from top to bottom and gathered at the bottom of the mixing kettle 1, and move upward from the return silo 5 at the bottom and then diffuse to the top of the mixing kettle 1;

[0055] An annular tube and a micro air pump matched therewith are installed on the top of the return silo 5, and a plurality of air nozzles 13 extending to the upper side of the upper discharge port 502 are arranged outside the annular tube. When the mixed dry material diffuses from the top of the return silo 5 toward the top of the mixing kettle 1, the multiple air nozzles 13 are used to spray air at the upper discharge port 502, so that the mixed dry material is efficiently diffused to the outside of the return silo 5 and mixed with the newly added mixed material 2, and a uniformly mixed mixed dry material is obtained by this cycle. The spiral shearing knife 11 and multiple groups of stirring shovels 8 are used to shear and diffuse the mixed dry material circulating up and down, thereby improving the mixing effect between the raw materials.

[0056] A ring-shaped water supply pipe 14 connected to an external water inlet pipe is fixedly installed on the top of the mixing kettle 1. A plurality of downwardly arranged nozzles are arranged on the ring-shaped water supply pipe 14. In the subsequent water adding and stirring process, water is sprayed into the mixing kettle 1 through the plurality of nozzles. In this process, the micro air pump is turned off, and the internal stirring structure and the external stirring structure are continuously operated. The spiral shearing knife 11 and the plurality of stirring shovels 8 are used to shear and diffuse the mixed slurry in the upward and downward circulating motion to avoid the formation of agglomerates and improve the uniformity of slurry preparation.

[0057] In summary: Considering that the slag of the steel industry has a large output and a low price, processing it into slag powder for the preparation of lightweight blocks can reduce the cost of raw materials. Recycling slag powder to prepare lightweight blocks can turn industrial waste slag into treasure, reduce slag storage and environmental pollution, and meet the strategic requirements of sustainable development;

[0058] Based on the principle of lightweight building block preparation and aiming at the diffusion characteristics of slag powder, the mixing and pulping of raw materials are improved, and a new mode of premixing individual raw materials and then adding new materials for cyclic mixing is adopted. First, other easily dispersible raw materials except slag powder are mixed to form a uniform mixture 1, and then the mixture 2 mixed with slag powder and surface modifier is rotated and diffused into the mixing kettle 1 through the feeding component 3. This process is continuous feeding and intermittent spreading of materials, and is equipped with the design of external stirring structure and internal stirring structure, so that the formed mixed dry materials rotate from top to bottom and gather at the bottom of the mixing kettle 1, and move upward from the return silo 5 at the bottom and diffuse to the top of the mixing kettle 1, and the cycle is repeated to obtain a uniformly mixed dry material;

[0059] In the subsequent water adding and stirring process, a spiral shearing knife 11 and multiple groups of stirring shovels 8 are used to shear and diffuse the mixed dry materials in the up and down circulating motion, thereby improving the mixing effect between the raw materials, avoiding the formation of agglomerates, and improving the uniformity of slurry preparation. The particle shape and grading of the slag powder can improve the pore structure of the lightweight blocks, make the pore distribution more uniform, and improve the performance of the lightweight blocks.

[0060] The above are only preferred specific implementation modes of the present invention; however, the protection scope of the present invention is not limited thereto; any technician familiar with the technical field within the technical scope disclosed by the present invention; any equivalent replacement or change based on the technical solution and improved concept of the present invention shall be covered within the protection scope of the present invention.

Claims

1. A method for preparing lightweight building blocks by regenerating slag powder, characterized in that: The following steps are involved: S1. Prepare materials: prepare raw materials according to the following weight parts: 30-40 parts of slag powder, 40-50 parts of building aggregate, 15-30 parts of slag silicate cement, and 10-25 parts of additives, wherein the additives include 8-15 parts of reinforcing agent, 5-8 parts of surfactant, and 3-5 parts of water reducing agent; S2, slag powder pretreatment; S3, premix: building aggregate, slag silicate cement, reinforcing agent, and water reducing agent are added to a mixing kettle (1), and premixed by using an external stirring structure and an internal stirring structure to obtain a mixture 1, and slag powder and surfactant are added to a mixing tank (2) to obtain a mixture 2; S4, secondary mixing: using the annular electric guide rail (4) to drive the mixing tank (2) to rotate in a circle, the second mixing material is gradually added into the mixing kettle (1) through the feeding assembly (3) in small amounts, and after the second mixing material contacts the first mixing material, it diffuses downward along the four sides under the rotation of the multiple groups of mixing shovels (8), and then is driven by the rotating spiral shearing knife (11) to the upper part of the return silo (5) and diffuses outward to mix with the newly added second mixing material, and the cycle is repeated to obtain a uniformly mixed dry material; S5, slurry preparation: adding an aqueous solution into the mixing kettle (1), and continuously stirring the mixed dry materials by using the cooperation of the external stirring structure and the internal stirring structure to obtain a slurry; S6. Forming and curing: pour the slurry into a mold for casting and forming. After forming, let it stand for 2-4 hours to obtain a lightweight block sample. Then, send it into a steam curing kettle, pass steam for high temperature and high pressure curing, and obtain a lightweight block.

2. The method for preparing lightweight building blocks by regenerating slag powder according to claim 1, characterized in that: In S2, the slag powder is crushed to a particle size of 0.1-0.17 mm, and magnetic separation and acid washing processes are performed successively to remove impurities, and then the slag powder is crushed to a particle size of 0.03-0.72 mm.

3. The method for preparing lightweight building blocks by regenerating slag powder according to claim 1, characterized in that: The mixing kettle (1) is fixedly mounted on a support frame, the annular electric guide rail (4) is fixedly mounted on the top of the support frame and is arranged coaxially with the mixing kettle (1), and the stirring tank (2) is driven by the annular electric guide rail (4) and rotates in a circle along the axis of the mixing kettle (1).

4. The method for preparing lightweight building blocks by regenerating slag powder according to claim 3, characterized in that: The return material silo (5) is fixedly installed at the center of the mixing kettle (1), and the bottom end wall of the return material silo (5) is provided with a plurality of lower feed inlets (501) connected to the bottom of the mixing kettle (1), and the top end wall of the return material silo (5) is provided with a plurality of upper discharge outlets (502) arranged to be inclined downward.

5. The method for preparing lightweight building blocks by regenerating slag powder according to claim 4, characterized in that: The external stirring structure comprises a rotating ring (7) which is rotatably mounted on the upper and lower inner walls of the mixing kettle (1); a plurality of wall-attached scrapers (6) which are arranged in contact with the inner wall of the mixing kettle (1) are annularly distributed between a pair of rotating rings (7); and two stirring shovels (8) which are distributed in upper and lower directions are arranged on the inner side of each wall-attached scraper (6).

6. The method for preparing lightweight building blocks by regenerating slag powder according to claim 5, characterized in that: The internal stirring structure comprises a rotating shaft (10) rotatably mounted at the center of the return material silo barrel (5) and a spiral shearing knife (11) sleeved thereon, wherein the upper end of the rotating shaft (10) passes through the top end of the return material silo barrel (5) and is fixedly connected to the wall-attached scraper (6) at the corresponding position through a plurality of armature rods (9).

7. The method for preparing lightweight building blocks by regenerating slag powder according to claim 1, characterized in that: The material conveying assembly (3) comprises a conveying pipe (31) fixedly connected to a material outlet at the bottom end of the mixing tank (2), a spiral material conveying plate (34) being rotatably mounted inside the conveying pipe (31), a plurality of material discharge slots (311) being provided inside the conveying pipe (31), and a sealing ring plate (33) for preliminary sealing of (411) being rotatably mounted on the conveying pipe (31).

8. The method for preparing lightweight building blocks by regenerating slag powder according to claim 7, characterized in that: A fixing sleeve is fixedly mounted on the end of the delivery pipe (31) away from the stirring tank (2), and a micro annular guide rail (32) is fixedly embedded in the fixing sleeve and located outside the end of the delivery pipe (31). The end of the blocking ring piece (33) is fixed on the micro annular guide rail (32) and is driven to rotate along the circumference of the axis of the delivery pipe (31).

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