Gypsum powder homogenization stirring system and method for preparing dihydrate gypsum

Abstract

The present invention provides a homogenizing stirring system for gypsum powder materials and a method for preparing dihydrate gypsum. The above-mentioned stirring system includes: a feeding hopper, a stirring device, a running-in device, and a water supply device; the stirring device includes a stirring cylinder, a stirring assembly, and a first driving mechanism. The stirring assembly is rotatably arranged in the stirring cylinder, and the driving end of the first driving mechanism is connected to the stirring assembly; one end of the stirring cylinder is communicated with the feeding hopper, and the other end is communicated with the running-in device; the top end of the stirring cylinder is provided with a plurality of spray heads, and the water supply device is connected to the plurality of spray heads. The water supply device controls the supply of water with a preset weight into the stirring cylinder according to the weight of the gypsum powder material fed into the stirring cylinder by the feeding hopper. In the stirring system of the present invention, the feeding hopper and the plurality of spray heads respectively feed a preset weight of gypsum powder material and a preset weight of water into the stirring cylinder. The stirring assembly stirs them. The stirred material undergoes multi-stage running-in treatment. The combination of stirring and running-in can obtain dihydrate gypsum with better homogeneity and stability.

Description

Technical Field

[0001] The present invention relates to the technical field of mixing equipment, and particularly relates to a gypsum powder homogenization mixing system and a method for preparing gypsum dihydrate therefrom. Background Art

[0002] Phosphogypsum is an industrial by-product of wet-process phosphoric acid production and is a solid waste with a large discharge in the production of phosphate chemical enterprises. Chemical treatment is carried out on phosphogypsum to remove harmful substances in the phosphogypsum, and purified gypsum powder is obtained. Through a mixing device, the gypsum powder and water are subjected to a hydration reaction to obtain gypsum dihydrate, and the gypsum dihydrate can be used for preparing gypsum building materials to realize the resource utilization of phosphogypsum.

[0003] In the prior art, through a mixing device, the mixed gypsum powder and water are stirred. The gypsum powder and water undergo a hydration reaction, and the ratio of the gypsum powder to water and the duration of the hydration reaction both affect the homogeneity and stability of the gypsum dihydrate. In the prior art, during the feeding process, the ratio of the gypsum powder to water cannot be accurately controlled. Usually, the method of adding more water is used to improve the homogeneity of the gypsum dihydrate, but excessive free water easily leads to poor stability of the gypsum dihydrate, and it is difficult to obtain gypsum dihydrate with better homogeneity and stability. Summary of the Invention

[0004] The present invention provides a gypsum powder homogenization mixing system and a method for preparing gypsum dihydrate therefrom, so as to solve the problem that in the existing mixing equipment, the ratio of gypsum powder to water cannot be effectively matched during the feeding process, resulting in poor homogeneity and stability of the prepared gypsum dihydrate.

[0005] In a first aspect, the present invention provides a gypsum powder homogenization mixing system, including: a feeding hopper, a mixing device, a grinding device, and a water supply device;

[0006] The mixing device includes a mixing barrel, a mixing component, and a first driving mechanism. The mixing component is rotatably arranged in the mixing barrel, and the driving end of the first driving mechanism is connected to the mixing component for driving the mixing component to rotate;

[0007] One end of the mixing barrel is communicated with the feeding hopper, and the feeding hopper is used for feeding gypsum powder into the mixing barrel;

[0008] The top end of the mixing barrel is provided with a plurality of nozzles. The water supply device is connected to the plurality of nozzles, and the water supply device is used for controlling the supply of a preset weight of water into the mixing barrel according to the weight of the gypsum powder fed into the mixing barrel by the feeding hopper;

[0009] The mixing device is used for stirring the gypsum powder and water to obtain gypsum dihydrate;

[0010] The running-in device is communicated with the other end of the mixing drum. The running-in device includes at least two running-in units, and two adjacent running-in units are communicated with each other. The running-in device is used for performing multi-stage running-in treatment on the materials output by the mixing drum.

[0011] According to a gypsum powder homogenization mixing system provided by the present invention, the gypsum powder homogenization mixing system further includes a weighing device and a controller, and both the weighing device and the water supply device are connected to the controller;

[0012] The weighing device is arranged on the outer wall surface of the feeding hopper, and the controller controls the feeding hopper to switch between a feeding state and a discharging state based on the weight value of the weighing device;

[0013] When the feeding hopper is in the discharging state, the controller controls the water supply device to supply water to the mixing drum.

[0014] According to a gypsum powder homogenization mixing system provided by the present invention, the mixing device further includes a crushing assembly;

[0015] The crushing assembly includes crushing blades, the crushing blades are arranged in the mixing drum, and the crushing blades are located outside the contour surface of the mixing assembly. The crushing blades are used for crushing materials.

[0016] According to a gypsum powder homogenization mixing system provided by the present invention, the crushing assembly further includes a carrier plate and a second driving mechanism;

[0017] The carrier plate is annular and is rotatably arranged in the mixing drum along the circumferential direction of the mixing drum; a plurality of the crushing blades are arranged on the carrier plate, and the plurality of crushing blades are arranged in sequence along the circumferential direction of the carrier plate;

[0018] The output end of the second driving mechanism is connected to the carrier plate to drive the carrier plate to rotate relative to the mixing drum.

[0019] According to a gypsum powder homogenization mixing system provided by the present invention, the running-in unit includes a housing, a fixed grinding disc, a rotating grinding disc and a third driving mechanism. A feeding cavity and a running-in cavity that communicate with each other are formed in the housing. The fixed grinding disc and the rotating grinding disc are both arranged in the running-in cavity, and a running-in channel is formed between the fixed grinding disc and the rotating grinding disc;

[0020] The driving end of the third driving mechanism is connected to the rotating grinding disc. The third driving mechanism is used for pushing the materials in the feeding cavity to the running-in channel and for driving the rotating grinding disc to rotate relative to the fixed grinding disc so as to perform running-in treatment on the materials.

[0021] A gypsum powder homogenizing and stirring system provided by the present invention, the gypsum powder homogenizing and stirring system further includes a cleaning device;

[0022] The cleaning device includes a gas supply pipeline, one end of the gas supply pipeline is communicated with the running-in cavity, and the other end is used for connecting with a gas source. The gas supply pipeline is used for introducing gas into the running-in cavity to wash away the residual materials in the running-in cavity.

[0023] A gypsum powder homogenizing and stirring system provided by the present invention, the gypsum powder homogenizing and stirring system further includes a dust removal device, and the dust removal device is communicated with the stirring cylinder.

[0024] A gypsum powder homogenizing and stirring system provided by the present invention, the stirring assembly includes a stirring part, the stirring part includes a stirring shaft and stirring blades, and a plurality of the stirring blades are spirally arranged on the stirring shaft.

[0025] A gypsum powder homogenizing and stirring system provided by the present invention, the stirring cylinder includes a first cylinder body and a second cylinder body which are detachably connected, and the stirring assembly further includes a connecting part which is detachably connected with the stirring part;

[0026] When the first cylinder body and the second cylinder body are in a connected state, the stirring part is located in the second cylinder body;

[0027] When the first cylinder body and the second cylinder body are in a separated state, the stirring part is exposed on the lower side of the first cylinder body.

[0028] [[ID=2l]]Second aspect, the present invention provides a method for preparing dihydrate gypsum by using a gypsum powder homogenizing and stirring system, including:

[0029] Obtain the weight of the gypsum powder introduced into the stirring cylinder, and control the water supply device to introduce a preset weight of water into the stirring cylinder according to the weight of the gypsum powder introduced into the stirring cylinder;

[0030] Control the stirring device to stir the gypsum powder and water;

[0031] Control the running-in device to perform multi-stage running-in treatment on the materials output by the stirring cylinder.

[0032] A method for preparing dihydrate gypsum by using a gypsum powder homogenizing and stirring system provided by the present invention further includes:

[0033] Transport the materials after the running-in treatment to a granulator, and the materials after the running-in treatment and water with a target weight undergo a hydration reaction to obtain dihydrate gypsum.

[0034] The homogenizing and stirring system for gypsum powder materials provided by the present invention and the method for preparing dihydrate gypsum therefrom. During a single feeding process, a feeding hopper feeds a preset weight of gypsum powder materials into a stirring cylinder, and multiple spray heads feed a preset weight of water into the stirring cylinder. A first driving mechanism drives a stirring assembly to fully stir the gypsum powder materials and water. The stirred materials are further subjected to multi-stage running-in treatment. The cooperation of stirring and running-in obtains homogenized hemihydrate gypsum, and further undergoes a hydration reaction to obtain dihydrate gypsum with better homogeneity and stability. Description of the Drawings

[0035] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0036] Figure 1 Figure 1 is one of the structural schematic diagrams of the homogenizing and stirring system for gypsum powder materials provided by the present invention;

[0037] Figure 2 Figure 2 is an axonometric view of the homogenizing and stirring system for gypsum powder materials provided by the present invention;

[0038] Figure 3 Figure 3 is a sectional view of the homogenizing and stirring system for gypsum powder materials provided by the present invention;

[0039] Figure 4 Figure 4 is another structural schematic diagram of the homogenizing and stirring system for gypsum powder materials provided by the present invention;

[0040] Figure 5 Figure 5 is a flow chart of the method for preparing dihydrate gypsum by using the homogenizing and stirring system for gypsum powder materials provided by the present invention;

[0041] Reference Numerals: 1: Feeding Hopper; 2: Stirring Device; 21: Stirring Cylinder; 211: First Cylinder Body; 212: Second Cylinder Body; 213: Cover Plate; 214: Guide Pipe; 22: Stirring Assembly; 23: First Driving Mechanism; 231: First Motor; 232: Driving Pulley; 233: Driven Pulley; 24: Second Driving Mechanism; 3: Discharge Hopper; 4: Running-in Unit; 41: Pushing Chamber; 42: Running-in Chamber; 43: Fixed Grinding Disc; 44: Rotating Grinding Disc; 45: Third Driving Mechanism. Detailed Embodiments

[0042] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts shall fall within the protection scope of the present invention.

[0043] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] The following will describe Figures 1 to 4 the gypsum powder homogenization stirring system of the present invention.

[0045] As Figure 1 , Figure 2 and Figure 3 shown, the gypsum powder homogenization stirring system provided by the present invention includes: a feed hopper 1, a stirring device 2, and a water supply device; the stirring device 2 includes a stirring cylinder 21, a stirring assembly 22, and a first driving mechanism 23. The stirring assembly 22 is rotatably arranged inside the stirring cylinder 21. The driving end of the first driving mechanism 23 is connected to the stirring assembly 22 for driving the stirring assembly 22 to rotate; one end of the stirring cylinder 21 is communicated with the feed hopper 1, and the feed hopper 1 is used for feeding gypsum powder into the stirring cylinder 21; the top end of the stirring cylinder 21 has a plurality of spray heads, and the water supply device is connected to the plurality of spray heads. The water supply device is used for controlling the supply of a preset weight of water into the stirring cylinder according to the weight of the gypsum powder fed into the stirring cylinder by the feed hopper; the stirring device 2 is used for stirring the gypsum powder and water. The running-in device is communicated with the other end of the stirring cylinder 21. The running-in device includes at least two running-in units 4, and adjacent two running-in units 4 are communicated. The running-in device is used for performing multi-stage running-in treatment on the materials output by the stirring cylinder 21.

[0046] Specifically, the gypsum powder homogenization stirring system includes a feed hopper 1, a stirring cylinder 21, and a discharge hopper 3. The discharge hopper 3, the stirring cylinder 21, and the feed hopper 1 are arranged in sequence along the vertical direction, and the feed hopper 1, the stirring cylinder 21, and the discharge hopper 3 are communicated with each other. The feed hopper 1 can be formed by splicing a cylindrical shell and a conical shell. The bottom end of the feed hopper 1 is provided with a discharge port. The top end of the stirring cylinder 21 is convexly provided with a guide channel, and the guide channel is arranged in alignment with the discharge port. For the convenience of description below, the gypsum powder homogenization stirring system is simply referred to as the stirring system.

[0047] The bottom end of the feeding hopper 1 is configured with a first sealing plate, which is detachably arranged at the discharge port. When the first sealing plate is in the first position, it can block the discharge port, and at this time, the feeding hopper 1 is in the feeding state; when the first sealing plate is in the second position, it is separated from the discharge port, and the discharge port is communicated with the material guiding channel, and at this time, the feeding hopper 1 is in the discharging state. It can be understood that a feeding device is provided at the feeding port of the feeding hopper 1, and the feeding device is used to convey gypsum powder to the feeding hopper 1. A weighing sensor can be installed on the feeding hopper 1 to weigh the gypsum powder in the feeding hopper 1. When the first sealing plate is in the first position, the feeding device conveys gypsum powder to the feeding hopper 1, and when the gypsum powder in the feeding hopper 1 reaches the preset weight, the feeding device stops conveying gypsum powder. When the first sealing plate is in the second position, the discharge port is communicated with the mixing drum 21, and the gypsum powder of the preset weight falls into the mixing drum 21 along the material guiding channel.

[0048] The mixing drum 21 includes a cylinder body and a cover plate. One end of the cylinder body is open, and the other end of the cylinder body is configured with a discharge port, and the discharge port is communicated with the discharge hopper 3. The discharge hopper 3 can also be formed by splicing a cylindrical shell and a conical shell. A material guiding pipe 214 can be arranged at the discharge port of the cylinder body, and the bottom surface of the material guiding pipe 214 is not higher than the top surface of the discharge hopper 3. The material in the mixing drum 21 flows into the discharge hopper 3 along the material guiding pipe 214, which can effectively prevent the material from splashing to the external environment during the flowing process. A second sealing plate is arranged at the outlet end of the material guiding pipe 214, and the second sealing plate is detachably arranged at the outlet end. When the second sealing plate is in the third position, it can block the material guiding pipe 214, and the mixing device 2 is in the mixing state; when the second sealing plate is in the fourth position, it is separated from the outlet end, and the material guiding pipe 214 is communicated with the discharge hopper 3, and the mixing device 2 is in the discharging state.

[0049] The mixing assembly 22 includes a mixing part, and the mixing part includes a mixing shaft and mixing blades. The number of mixing blades is set according to actual needs. A plurality of mixing blades are arranged at intervals along the axis direction of the mixing shaft, and a plurality of mixing blades are spirally arranged on the mixing shaft. The spirally arranged plurality of mixing blades is beneficial to fully mix the material.

[0050] The first driving mechanism 23 includes a motor and a transmission component. Define this motor as the first motor 231. The first motor 231 is connected to the stirring component 22 through the transmission component. The transmission component can be a belt drive structure, a chain drive structure, a gear drive structure, etc. For example, when the transmission component is a belt drive structure, the transmission component includes a driving pulley 232, a driven pulley 233 and a belt. The driving shaft of the first motor 231 is connected to the driving pulley 232, the driven pulley 233 is connected to one end of the stirring shaft, and the belt is sleeved on the driving pulley 232 and the driven pulley 233. The first motor 231 drives the driving pulley 232 to rotate, driving the driven pulley 233 and the stirring component 22 to rotate synchronously. The first motor 231 can rotate forward and backward, and the rotation parameters of the first motor 231 can be set according to actual needs. For example, the first motor 231 drives the stirring component 22 to rotate a target number of turns in the clockwise direction at a target speed, or the first motor 231 drives the stirring component 22 to rotate a target number of turns in the counterclockwise direction at a target speed.

[0051] Optionally, the mounting seat for fixing the first motor 231 can be connected to the cover plate 213. For example, the mounting seat includes two side plates arranged oppositely and a bottom plate for connecting the two side plates. A connecting portion is formed by the edge of the cover plate 213 extending outward. One side plate is connected to the connecting portion, and the base of the first motor 231 is connected to the other side plate. The mounting method of the first motor 231 is not specifically limited.

[0052] A plurality of nozzles are installed on the cover plate 213 of the mixing drum 21, and the plurality of nozzles are arranged at intervals on the cover plate 213. The water supply device includes a plurality of liquid supply pipelines, and the plurality of liquid supply pipelines are connected to the plurality of nozzles one by one. One end of the liquid supply pipeline is connected to a water source, and the other end of the liquid supply pipeline is connected to the nozzle. A control valve can be provided on the liquid supply pipeline. The control valve is used to control the on-off of the liquid supply pipeline. When the liquid supply pipeline is in a conducting state, the liquid supply pipeline conveys water to the mixing drum 21. The plurality of nozzles can spray water droplets into the mixing drum 21 from multiple directions. During a single feeding process, by controlling the liquid supply flow rate and the liquid supply duration, a preset weight of water can be introduced into the mixing drum 21. This preset weight of water is used to make the gypsum powder fully crystallize. The preset weight of water accounts for 8-22% of the weight of the reactants. A retarder of 0.1-0.5% or a waterproof agent of 0.1-0.5% can also be added to the reactants.

[0053] The gypsum powder and water are fully mixed under the agitation of the stirring component 22. The crystal water wraps the hemihydrate gypsum. During this process, there will inevitably be free water that is not combined with the hemihydrate gypsum, as well as a small amount of dihydrate gypsum. The material output from the mixing drum 21 includes hemihydrate gypsum, as well as a small amount of dihydrate gypsum and free water. The running-in device is used to perform multi-stage running-in treatment on the material output from the mixing drum 21 so that the hemihydrate gypsum that is not combined with water can be wrapped by the crystal water. The stirring duration is 2-5 minutes, and the running-in duration is 2-5 minutes.

[0054] The number of the running-in units 4 is set according to actual requirements. The number of the running-in units 4 can be one, two or more. When the number of the running-in units 4 is more than one, the multiple running-in units 4 are arranged in sequence in the vertical direction, and two adjacent running-in units 4 are communicated with each other. The running-in unit 4 has a pushing cavity 41 and a running-in cavity 42 which are communicated with each other.

[0055] Taking two running-in units 4 as an example for illustration, the two running-in units 4 are defined as a first running-in unit and a second running-in unit respectively. The pushing cavity 41 of the first running-in unit is communicated with the outlet end of the discharge hopper 3, and the running-in cavity 42 of the first running-in unit is communicated with the pushing cavity 41 of the second running-in unit. The material falling into the pushing cavity 41 of the first running-in unit 4 is pushed to the running-in channel, and the hemihydrate gypsum and free water in the material are in full contact under the action of friction force. Then the material falls from the running-in cavity 42 of the first running-in unit 4 into the pushing cavity 41 of the second running-in unit 4. The material in the pushing cavity 41 of the second running-in unit 4 is pushed to the running-in channel, and the uncombined hemihydrate gypsum and free water in the material are further in full contact under the action of friction force. After the material undergoes two times of running-in, the hemihydrate gypsum and free water in the material are in full contact to cause crystal form transformation, which is beneficial to further improving the homogeneity of the hemihydrate gypsum. It can be understood that the multiple running-in units 4 can perform multi-stage running-in treatment on the material, effectively improving the homogeneity of the hemihydrate gypsum.

[0056] For the hemihydrate gypsum obtained after the running-in treatment, it needs to be further processed. The homogenized hemihydrate gypsum after the running-in treatment is conveyed into a granulator, and at this time, water with a target weight needs to be added to the granulator. The water with the target weight is used to enable the hemihydrate gypsum and water to fully undergo a hydration reaction and be transformed into dihydrate gypsum with appropriate strength and suitable for industrial application. The water with the target weight accounts for 27-33% of the weight of the reactants.

[0057] After the gypsum powder and water are subjected to stirring treatment and then running-in treatment, the hemihydrate gypsum and free water in the material after the stirring treatment are in full contact under the action of friction force to obtain hemihydrate gypsum with better homogeneity. The hemihydrate gypsum with better homogeneity then undergoes a hydration reaction with water with a target weight to obtain dihydrate gypsum with better homogeneity and stability.

[0058] The working process of the stirring system is described below. The feed hopper 1 is in the feeding state, and the feeding device conveys gypsum powder to the feed hopper 1. After the gypsum powder in the feed hopper 1 reaches the preset weight, the feed hopper 1 switches to the discharging state, and the gypsum powder of the preset weight falls into the stirring cylinder 21 along the material guiding channel. At the same time, the liquid supply pipeline is conducted, and multiple nozzles spray water droplets into the stirring cylinder 21, and the preset weight of water is introduced into the stirring cylinder 21 by controlling the liquid supply duration and the liquid supply flow rate. During a single feeding process, the gypsum powder of the preset weight and the water of the preset weight are introduced into the stirring cylinder 21, and the mixture of the gypsum powder and water is defined as the material. During the feeding process and after the feeding is completed, the first motor 231 drives the stirring assembly 22 to rotate to fully stir the material. After the stirring for the target duration, hemihydrate gypsum with better homogeneity can be obtained. The prepared hemihydrate gypsum falls into the discharge hopper 3 along the material guiding pipe 214 and is further conveyed to the running-in device. The running-in device performs multi-stage running-in treatment on the material, so that the hemihydrate gypsum and the free water in the material output by the stirring cylinder are in full contact.

[0059] It can be understood that the gypsum powder undergoes a hydration reaction with water, and the ratio of the gypsum powder to water and the duration of the hydration reaction both affect the homogeneity and stability of the dihydrate gypsum. In the traditional stirring process, the homogeneity of the dihydrate gypsum is improved by adding more water, but the excessive free water results in poor stability of the dihydrate gypsum. In the present invention, during the feeding process, multiple nozzles spray water droplets into the stirring cylinder 21, and the gypsum powder of the preset weight and the water of the preset weight are fully mixed within the target duration. Under the stirring of the stirring assembly 22 and the running-in of the running-in device, homogenized hemihydrate gypsum is obtained, and further hydration reaction occurs, so that dihydrate gypsum with better homogeneity and stability can be obtained.

[0060] In the embodiment of the present invention, during a single feeding process, the feed hopper 1 introduces the gypsum powder of the preset weight into the stirring cylinder 21, multiple nozzles introduce the water of the preset weight into the stirring cylinder 21, the first driving mechanism 23 drives the stirring assembly 22 to fully stir the gypsum powder and water, and the stirred material is further subjected to multi-stage running-in treatment. The cooperation of stirring and running-in results in the obtained homogenized hemihydrate gypsum, and further hydration reaction occurs, so that dihydrate gypsum with better homogeneity and stability can be obtained.

[0061] In an optional embodiment, the gypsum powder homogenization stirring system further includes a weighing device and a controller, and both the weighing device and the water supply device are connected to the controller; the weighing device is arranged on the outer wall surface of the feed hopper 1, and the controller controls the feed hopper 1 to switch between the feeding state and the discharging state based on the weight value of the weighing device; when the feed hopper 1 is in the discharging state, the controller controls the water supply device to supply water to the stirring cylinder 21.

[0062] Specifically, the weighing device includes a weighing sensor, which is installed on the outer wall surface of the feeding hopper 1. An opening and closing assembly is provided at the discharge port of the feeding hopper 1. The opening and closing assembly is electrically connected to the controller. The opening and closing assembly includes a control valve and a first sealing plate. The control valve can control the first sealing plate to switch between a first position and a second position. When the first sealing plate is in the first position, the first sealing plate can block the discharge port, and the feeding hopper 1 is in the feeding state. When the first sealing plate is in the second position, the first sealing plate is separated from the discharge port, the discharge port is communicated with the guiding channel, and the feeding hopper 1 is in the discharging state.

[0063] The weighing sensor and multiple liquid supply pipelines are both connected to the controller. The feeding device conveys gypsum powder into the feeding hopper 1. When the weighing sensor detects that the gypsum powder in the feeding hopper 1 reaches the preset weight, the feeding device stops feeding. The controller controls the first sealing plate to switch from the first position to the second position based on the weight signal of the weighing sensor, and the feeding hopper 1 switches to the discharging state. At this time, the gypsum powder of the preset weight falls into the mixing drum 21. At the same time, the controller controls the multiple liquid supply pipelines to be in a conducting state, and injects water of the preset weight into the mixing drum 21 through multiple spray heads. The gypsum powder of the preset weight and the water of the preset weight are fully contacted under the agitation of the mixing assembly 22.

[0064] In the embodiment of the present invention, by setting the weighing device to precisely control the weight of the gypsum powder in each feeding process, and the controller controls the water supply device to supply water based on the weight signal of the weighing device, effectively ensuring the mixing ratio accuracy of the gypsum powder and water during the feeding process.

[0065] In an alternative embodiment, the mixing device 2 further includes a crushing assembly; the crushing assembly includes crushing blades, and the crushing blades are arranged in the mixing drum 21 and are located outside the contour surface of the mixing assembly 22. The crushing blades are used for crushing materials.

[0066] Specifically, the crushing assembly includes crushing blades. The crushing blades can be installed on the inner wall surface of the mixing drum 21. The number of the crushing blades can be one or more. When the number of the crushing blades is multiple, the multiple crushing blades are circumferentially spaced apart from each other around the central axis of the mixing drum 21 on the inner wall surface of the mixing drum 21. It can be understood that there is a gap between the crushing blades and the mixing blades to ensure that the two do not collide during the mixing process.

[0067] The mixing assembly 22 stirs the mixed material after the hemihydrate gypsum and water are mixed. There will inevitably be large-sized agglomerated particulate matters in the material. The crushing blades cut the agglomerated particulate matters and break them into fine particles, which is beneficial to further improving the homogeneity of the hemihydrate gypsum.

[0068] In an alternative embodiment, the crushing assembly further includes a carrier plate and a second driving mechanism 24; the carrier plate is annular and is rotatably disposed inside the mixing drum 21 along the circumferential direction of the mixing drum 21; a plurality of crushing blades are provided on the carrier plate, and the plurality of crushing blades are sequentially arranged along the circumferential direction of the carrier plate; the output end of the second driving mechanism 24 is connected to the carrier plate to drive the carrier plate to rotate relative to the mixing drum 21.

[0069] Specifically, the carrier plate may be circular, there is a first distance between the inner wall surface of the carrier plate and the mixing blades, and there is a second distance between the outer wall surface of the carrier plate and the inner wall surface of the mixing drum 21. The plurality of crushing blades are arranged at intervals in the circumferential direction on the carrier plate. The carrier plate is coaxially arranged with the mixing shaft. The plurality of crushing blades may be provided on the same side of the carrier plate, or the plurality of crushing blades may be staggeredly arranged on opposite sides of the carrier plate. The second driving mechanism 24 includes a second motor and a second transmission assembly. The second motor is connected to the carrier plate through the second transmission assembly. The second motor drives the carrier plate to rotate, and the carrier plate drives the plurality of crushing blades to rotate. The second motor can rotate forward and backward.

[0070] Further, the rotation direction of the crushing blades is opposite to the rotation direction of the mixing blades, that is, the first motor 231 drives the mixing blades to rotate in the clockwise direction, and the second motor drives the crushing blades to rotate in the counterclockwise direction. The rotation direction of the crushing blades is opposite to that of the mixing blades. The crushing blades cut the agglomerated particulate matter in the direction opposite to the swirling direction of the material, effectively increasing the impact energy of the crushing blades on the agglomerated particles, which is beneficial to improving the crushing efficiency and crushing effect.

[0071] As Figure 1 、 Figure 2 and Figure 3 shown, in an alternative embodiment, the running-in unit 4 includes a housing, a fixed grinding disc 43, a rotating grinding disc 44 and a third driving mechanism 45. A pushing chamber 41 and a running-in chamber 42 that communicate with each other are constructed inside the housing. The pushing chamber 41 communicates with the mixing drum 21. The fixed grinding disc 43 and the rotating grinding disc 44 are both disposed in the running-in chamber 42, and a running-in channel is formed between the fixed grinding disc 43 and the rotating grinding disc 44. The driving end of the third driving mechanism 45 is connected to the rotating grinding disc 44. The third driving mechanism 45 is used to push the material in the pushing chamber 41 to the running-in channel, and is used to drive the rotating grinding disc 44 to rotate relative to the fixed grinding disc 43 to perform running-in treatment on the material.

[0072] Specifically, the housing is formed by combining a first housing and a second housing. The first housing is arranged horizontally and can be cylindrical. The second housing is arranged vertically and can be fan-shaped. A partial section of the first housing is embedded in the second housing. A pushing chamber 41 is formed inside the first housing, and a running-in chamber 42 is formed inside the second housing. The pushing chamber 41 and the running-in chamber 42 communicate with each other. A fixed grinding disc 43 and a rotating grinding disc 44 are both located in the running-in chamber 42. The fixed grinding disc 43 and the rotating grinding disc 44 are both arranged vertically, and a running-in channel is formed between the opposing surfaces of the fixed grinding disc 43 and the rotating grinding disc 44. The outlet end of the discharge hopper 3 extends into the first housing, whereby the discharge hopper 3 communicates with the pushing chamber 41. A discharge port is configured at the bottom of the second housing.

[0073] One end of the first housing embedded in the second housing is connected to the fixed grinding disc 43. The central axis of the fixed grinding disc 43 is coaxial with the central axis of the first housing. The third driving mechanism 45 includes a third motor and a propulsion assembly. The propulsion assembly includes a rotating shaft and propulsion blades. The propulsion blades are spirally arranged on the rotating shaft. The axis of the rotating shaft is coaxial with the central axis of the first housing. One end of the rotating shaft extending into the running-in chamber 42 is connected to the rotating grinding disc 44, and the other end of the rotating shaft is power-coupled to the third motor. The third motor can be fixed to the other end of the first housing.

[0074] The material output by the mixing drum 21 falls into the discharge hopper 3, and further falls from the discharge hopper 3 into the pushing chamber 41. The third motor drives the rotating shaft and the propulsion blades to rotate, pushing the material from the pushing chamber 41 to the running-in channel. The third motor drives the rotating grinding disc 44 to rotate relative to the fixed grinding disc 43, running in the material at the running-in channel. Under the action of friction, the hemihydrate gypsum and free water in the material come into full contact. The material after running-in falls into the running-in chamber 42 and can further be discharged from the discharge port of the second housing.

[0075] In the embodiment of the present invention, after the material falls into the pushing chamber 41, it is further pushed to the running-in channel. The rotating grinding disc 44 rotates relative to the fixed grinding disc 43. Under the action of friction, the hemihydrate gypsum and free water in the material come into full contact, obtaining homogenized hemihydrate gypsum. The overall structure is compact and is conducive to the growth of dihydrate gypsum crystals in the later stage.

[0076] In an alternative embodiment, the mixing system further includes a cleaning device; the cleaning device includes a gas supply pipeline. One end of the gas supply pipeline communicates with the running-in chamber 42, and the other end is used to connect to a gas source. The gas supply pipeline is used to introduce gas into the running-in chamber 42 to flush the residual material in the running-in chamber 42.

[0077] Specifically, one end of the air supply pipeline extends into the running-in cavity 42, and the other end of the air supply pipeline is connected to the air source. The air supply pipeline is used to introduce high-pressure gas into the running-in cavity 42. After running-in, the hemihydrate gypsum is discharged from the running-in cavity 42, and a small amount of hemihydrate gypsum will adhere to the wall surface of the running-in cavity 42, the surface of the rotating grinding disc 44, and the surface of the fixed grinding disc 43. The air supply pipeline introduces high-pressure gas into the running-in cavity 42, and the high-pressure gas flushes the adhered hemihydrate gypsum, and the flushed hemihydrate gypsum is further discharged from the running-in cavity 42.

[0078] The high-pressure gas flushes the adhered hemihydrate gypsum, effectively solving the problem of residual materials remaining in the running-in cavity 42. In addition, the flushed hemihydrate gypsum can be recycled and used as the raw material for the next mixing, improving the utilization rate of the raw materials.

[0079] In an alternative embodiment, the mixing system further includes a dust removal device, which is communicated with the mixing drum 21 and is used to remove dust.

[0080] Specifically, the dust removal device can be a bag filter, which includes a dust removal pipeline, a dust collector, and an exhaust pipeline. Both the dust removal pipeline and the exhaust pipeline are communicated with the dust collector. One end of the dust removal pipeline is communicated with the cover plate 213 of the mixing drum 21, and the other end is communicated with the dust collector. During the process of introducing gypsum powder into the mixing drum 21, the dust floating above the mixing drum 21 flows into the dust collector through the dust removal pipeline, and the clean gas after dust removal treatment is discharged into the atmosphere through the exhaust pipeline.

[0081] The dust removal device adsorbs the dust floating during the feeding process, preventing the dust from escaping into the external environment and polluting the working environment, and at the same time avoiding the dust from affecting the operators.

[0082] As Figure 3 shown, in an alternative embodiment, the mixing drum 21 includes a first cylinder body 211 and a second cylinder body 212 that are detachably connected, and the mixing assembly 22 further includes a connecting part that is detachably connected to the mixing part; when the first cylinder body 211 and the second cylinder body 212 are in a connected state, the mixing part is located inside the second cylinder body 212; when the first cylinder body 211 and the second cylinder body 212 are in a separated state, the mixing part is exposed on the lower side of the first cylinder body 211.

[0083] Specifically, the mixing drum 21 includes a drum body and a cover plate 213. The drum body is formed by combining a first drum body 211 and a second drum body 212. The first drum body 211 is located above, and the second drum body 212 is located below. A first flange connection part is formed on the bottom surface of the first drum body 211, and a second flange connection part is formed on the top surface of the second drum body 212. The first flange connection part and the second flange connection part are connected by fasteners to achieve the detachable connection between the first drum body 211 and the second drum body 212. A gasket can be arranged between the opposite surfaces of the first flange connection part and the second flange connection part to ensure the sealing performance of the mixing drum 21.

[0084] The cover plate 213 is covered at the open end of the first drum body 211. The cover plate 213 is detachably connected to the first drum body 211, and a plurality of nozzles are arranged on the cover plate 213 at intervals. A material guiding channel is also arranged on the cover plate 213, and the gypsum powder in the feeding hopper 1 falls into the mixing drum 21 along the material guiding channel.

[0085] When the first drum body 211 and the second drum body 212 are in a connected state, the mixing shaft and the mixing blades are located in the second drum body 212. The mixing shaft and the mixing blades rotate to enable the semi-hydrated gypsum and water to be fully mixed.

[0086] Material residue is likely to occur at the bottom of the mixing drum 21, and the residual material will affect the preparation of dihydrate gypsum next time. The drum body adopts a split structure. When it is necessary to clean the residual material, the second drum body 212 is disassembled, which is convenient for cleaning the residual material and effectively reduces the cleaning time.

[0087] The mixing assembly 22 includes a mixing part and a connecting part. One end of the mixing shaft is connected to the driven wheel through the connecting part. When the mixing part is worn, the second drum body 212 is disassembled, which is convenient for replacing the mixing part and is beneficial to the convenience of maintenance.

[0088] As Figure 3 and Figure 4 shown, further, a material guiding pipe 214 is arranged at the bottom of the second drum body 212. The bottom surface of the material guiding pipe 214 is not higher than the top surface of the discharge hopper 3. A spiral propulsion assembly is arranged in the material guiding pipe 214. The spiral propulsion assembly includes a rotating shaft and spiral blades arranged on the rotating shaft. The rotating shaft can be connected to the mixing shaft. The material falls into the discharge hopper 3 along the spiral movement track, which can effectively avoid the phenomenon of caking. The installation method of the material guiding pipe 214 can be set according to the use requirements. The material guiding pipe 214 can be arranged vertically or obliquely.

[0089] In the embodiment of the present invention, the detachable connection between the first drum body 211 and the second drum body 212 is convenient for cleaning the residual material in the mixing drum 21, effectively reducing the cleaning time. In addition, it is beneficial to the convenience of maintaining the mixing assembly 22 and effectively ensures the efficient operation of the mixing system.

[0090] like Figure 5 As shown, the present invention also provides a method for preparing dihydrate gypsum using a gypsum powder homogenizing and stirring system, and the method for preparing dihydrate gypsum includes:

[0091] Step 101: Obtain the weight of the gypsum powder introduced into the mixing drum 21, and control a water supply device to introduce a preset weight of water into the mixing drum 21 according to the weight of the gypsum powder introduced into the mixing drum 21;

[0092] Step 102: Control the stirring device 2 to stir the gypsum powder and water;

[0093] Step 103: Control the running-in device to perform multi-stage running-in processing on the material output from the mixing drum 21 .

[0094] Specifically, the gypsum powder homogenization and mixing system is described above, and the preparation process is described below. A weighing device can be installed on the outer wall of the feeding hopper 1 to obtain the weight of the gypsum powder. The feeding hopper 1 is in a feeding state, and the feeding device conveys gypsum powder to the feeding hopper 1. After the gypsum powder in the feeding hopper 1 reaches a preset weight, the feeding hopper 1 switches to a discharging state, and the preset weight of gypsum powder falls into the mixing drum 21 along the material guide channel. At the same time, the liquid supply pipeline is turned on, and multiple nozzles spray water droplets toward the mixing drum 21, and a preset weight of water is introduced into the mixing drum 21 by controlling the liquid supply duration and liquid supply flow rate. During a single feeding process, a preset weight of gypsum powder and a preset weight of water are introduced into the mixing drum 21.

[0095] During and after the feeding process, the first motor 231 drives the stirring assembly 22 to rotate and thoroughly stir the material. After stirring for the target duration, hemihydrate gypsum with excellent homogeneity and stability is obtained. The stirred material falls through the material guide pipe 214 into the discharge hopper 3. The material discharged from the mixing drum 21 includes hemihydrate gypsum, a small amount of dihydrate gypsum, and free water. The material further falls from the discharge hopper 3 into the running-in device. The running-in device performs a multi-stage running-in process on the material, ensuring that the hemihydrate gypsum and free water in the material are fully contacted, thereby obtaining a homogenized hemihydrate gypsum.

[0096] The homogenized hemihydrate gypsum after the running-in treatment is transported to the material making machine. At this time, the target weight of water is added to the material making machine. The target weight of water and the hemihydrate gypsum with better homogeneity fully undergo hydration reaction to obtain dihydrate gypsum with better homogeneity and stability.

[0097] Using the above-mentioned gypsum powder homogenization stirring system to prepare dihydrate gypsum, during a single feeding process, a feed hopper 1 feeds a preset weight of gypsum powder into a stirring cylinder 21, and multiple spray heads feed a preset weight of water into the stirring cylinder 21. A first driving mechanism 23 drives a stirring assembly 22 to fully stir the gypsum powder and water. The stirred material further undergoes multi-stage running-in treatment. The combination of stirring and running-in obtains homogenized hemihydrate gypsum. The hemihydrate gypsum and water further undergo a hydration reaction to obtain dihydrate gypsum with better homogeneity and stability.

[0098] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A homogenizing and stirring system for gypsum powder materials, characterized in that, Comprising: A feed hopper, a stirring device, a running-in device, and a water supply device; The stirring device includes a stirring cylinder, a stirring assembly, and a first driving mechanism. The stirring assembly is rotatably arranged inside the stirring cylinder, and the driving end of the first driving mechanism is connected to the stirring assembly for driving the stirring assembly to rotate; One end of the stirring cylinder is communicated with the feed hopper, and the feed hopper is used for feeding gypsum powder into the stirring cylinder; The top end of the stirring cylinder is provided with a plurality of spray heads. The water supply device is connected to the plurality of spray heads. The water supply device is used for controlling the supply of a preset weight of water into the stirring cylinder according to the weight of the gypsum powder fed into the stirring cylinder by the feed hopper, so that the gypsum powder can crystallize sufficiently. The preset weight of water accounts for 8-22% of the weight of the reactants; The stirring device is used for stirring the gypsum powder and water; The running-in device is communicated with the other end of the stirring cylinder. The running-in device includes at least two running-in units, and adjacent two running-in units are communicated. The running-in device is used for performing multi-stage running-in treatment on the material output by the stirring cylinder, so that the hemihydrate gypsum and free water in the material can fully contact and undergo crystal form transformation to obtain homogenized hemihydrate gypsum; It further includes a granulator. The hemihydrate gypsum input from the running-in device and water with a target weight undergo a hydration reaction to obtain dihydrate gypsum.

2. The gypsum powder homogenization stirring system according to claim 1, wherein The gypsum powder homogenizing and stirring system further includes a weighing device and a controller. The weighing device and the water supply device are both connected to the controller; The weighing device is arranged on the outer wall surface of the feed hopper, and the controller controls the switching of the feed hopper between the feeding state and the discharging state based on the weight value of the weighing device; When the feed hopper is in the discharging state, the controller controls the water supply device to supply water to the stirring cylinder.

3. The homogenizing and stirring system for gypsum powder materials according to claim 1, wherein, The stirring device further includes a crushing assembly; The crushing assembly includes crushing blades. The crushing blades are arranged inside the stirring cylinder, and the crushing blades are located outside the contour surface of the stirring assembly. The crushing blades are used for crushing materials.

4. The homogenizing and stirring system for gypsum powder materials according to claim 3, wherein, The crushing assembly further includes a bearing plate and a second driving mechanism; The bearing plate is annular and is rotatably arranged inside the stirring cylinder along the circumferential direction of the stirring cylinder; a plurality of the crushing blades are arranged on the bearing plate, and the plurality of crushing blades are arranged in sequence along the circumferential direction of the bearing plate; The output end of the second driving mechanism is connected to the bearing plate to drive the bearing plate to rotate relative to the stirring cylinder.

5. The homogenizing and stirring system for gypsum powder materials according to claim 1, wherein The running-in unit includes a housing, a fixed grinding disc, a rotating grinding disc, and a third driving mechanism. A pushing cavity and a running-in cavity that communicate with each other are constructed inside the housing. The fixed grinding disc and the rotating grinding disc are both arranged in the running-in cavity, and a running-in channel is formed between the fixed grinding disc and the rotating grinding disc; The driving end of the third driving mechanism is connected to the rotating grinding disc. The third driving mechanism is used for pushing the material in the pushing cavity to the running-in channel and for driving the rotating grinding disc to rotate relative to the fixed grinding disc to perform running-in treatment on the material.

6. The gypsum powder homogenization stirring system according to claim 5, characterized in that, The gypsum powder homogenizing and stirring system further includes a cleaning device; The cleaning device includes an air supply pipeline. One end of the air supply pipeline is communicated with the running-in cavity, and the other end is used to connect with an air source. The air supply pipeline is used to introduce gas into the running-in cavity to wash away the residual materials in the running-in cavity.

7. The gypsum powder homogenizing and stirring system according to claim 1, characterized in that, The gypsum powder homogenization and stirring system further includes a dust removal device, and the dust removal device is communicated with the stirring cylinder.

8. The homogenizing and stirring system for gypsum powder materials according to any one of claims 1 to 7, characterized in that, The stirring assembly includes a stirring part, and the stirring part includes a stirring shaft and stirring blades. A plurality of the stirring blades are spirally arranged on the stirring shaft.

9. The homogenizing and stirring system for gypsum powder materials according to claim 8, characterized in that, The stirring cylinder includes a first cylinder body and a second cylinder body which are detachably connected. The stirring assembly further includes a connecting part which is detachably connected with the stirring part. When the first cylinder body and the second cylinder body are in a connected state, the stirring part is located inside the second cylinder body. When the first cylinder body and the second cylinder body are in a separated state, the stirring part is exposed on the lower side of the first cylinder body.

10. A method for preparing gypsum dihydrate by using the gypsum powder homogenization and stirring system according to any one of claims 1 to 9, characterized in that, Including: Obtain the weight of the gypsum powder introduced into the stirring cylinder, and according to the weight of the gypsum powder introduced into the stirring cylinder, control the water supply device to introduce water with a preset weight into the stirring cylinder. Control the stirring device to stir the gypsum powder and water. Control the running-in device to perform multi-stage running-in treatment on the materials output by the stirring cylinder.

11. The method for preparing gypsum dihydrate by the gypsum powder homogenization stirring system according to claim 10, characterized in that, Further including: Transport the materials after the running-in treatment to a granulator, and the materials after the running-in treatment and water with a target weight undergo a hydration reaction to obtain gypsum dihydrate.

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