A pretreatment method for phosphogypsum for producing paper-faced gypsum board

Abstract

A method for pretreating phosphogypsum for use in the production of gypsum board is disclosed. The method comprises employing a processing chamber comprising an ultrasonic device, a heating device, and a rotating device, and a production line formed by a specially designed screener and a flotation machine. A master control device uses a pretrained large model to perform real-time pretreatment process control based on operating parameters transmitted from each device, thereby achieving a relatively low-cost, efficient, intelligent pretreatment process for small batches of phosphogypsum.

Description

Technical Field

[0001] The invention relates to a pretreatment method for phosphogypsum, in particular to a pretreatment method for phosphogypsum used in the production of paper-faced gypsum boards, and belongs to the field of building material production. Background Art

[0002] Conventional gypsum board processing only analyzes the pretreatment steps, not the complete production line. Large-scale pretreatment production lines require separate equipment for each step, resulting in significant costs that may be unaffordable for small businesses producing in smaller quantities. Therefore, for small-batch production, a completely new assembly line must be considered, integrating various pretreatment steps and considering how to coordinate them using artificial intelligence. Summary of the Invention

[0003] In view of the above-mentioned shortcomings of the prior art, the present invention provides a method for pretreating phosphogypsum for the production of paper-faced gypsum board for small-batch pretreatment of phosphogypsum, which comprises adopting the following production line:

[0004] The invention comprises a processing chamber with an exhaust valve, a screener, a first conveyor belt, a flotation machine, a second conveyor belt, a ball mill, and a third conveyor belt, which are sequentially arranged on a rotatable device. The first conveyor belt conveys the phosphogypsum that has been screened to the flotation machine, the second conveyor belt conveys the phosphogypsum that has been flotated to the ball mill, and the third conveyor belt leads to the processing chamber for further calcination.

[0005] A first flange and a second flange are respectively provided at both ends of the processing chamber, the first flange having a port for introducing deionized water and reagents, and the second flange is connected to a first pumping device via a pipeline. An ultrasonic device and a heating device are provided on both sides of the length direction of the processing chamber to respectively transmit ultrasonic waves and heat to the interior of the processing chamber in close contact with the surface of the processing chamber, respectively, for vibration enhancement treatment effects in water washing and neutralization treatment, as well as calcination. The rotatable device, screen, flotation machine, ball mill, first pumping device, ultrasonic device and heating device are connected to a master control device for performing real-time pretreatment process control using a pre-trained large model based on the transmitted operating parameters; specifically comprising:

[0006] S1 raw materials are loaded into the processing chamber, and after the first flange and the second flange are installed, the master control equipment controls the operation of the rotatable device and the ultrasonic device, and controls the deionized water to enter the processing chamber for circulating water washing and pumping treatment.

[0007] After the last pumping of S2 is completed, the master control device controls the reagents to enter the treatment chamber for neutralization, and finally pumps out water, turns off the ultrasonic device, and starts the heating device for drying.

[0008] It will be readily appreciated that both the rotatable device and the ultrasonic device are still in operation until the steps described for stopping the rotatable device and the ultrasonic device are completed.

[0009] S3 removes the first and second flanges and sends the dried material into the sifter for screening.

[0010] The first conveyor belt of S4 sends the screened materials to the flotation machine for flotation.

[0011] The second conveyor belt S5 conveys the flotation material after flotation into the ball mill for ball milling.

[0012] S6 The third conveyor brings the ball mill material to the processing chamber, loads the material and starts the heating device for calcination.

[0013] Optionally, the processing chamber is a tubular double-layer casing with stainless steel on the outside and corundum on the inside. The rotatable device includes a base for supporting the middle part of the processing chamber. The base has a shaft through which a driven gear is passed. The driven gear engages with the driving gear at the output end of the motor, and the motor is connected to the master control device.

[0014] Optionally, the exhaust valve is connected to an air pressure measuring device of a master control device.

[0015] Optionally, the deionized water and the reagents are respectively contained in supply tanks controlled by the master control device.

[0016] Optionally, there are multiple ultrasonic devices and heating devices, each connected by a connecting rod, so that a mobile vehicle can be used to fix and support the connecting rod to perform the operations of close contact and removal. The connecting rod has a universal joint and rotates with the rotatable device.

[0017] Optionally, the screener includes a shell and a plurality of vertically arranged shaking tables in the shell, each layer of shaking tables is provided with a sorting membrane with a mesh size decreasing from top to bottom, and the first conveyor belt is located below the bottom layer of shaking tables.

[0018] Optionally, the flotation machine includes a chamber, a motor with a stirring paddle, and a second pumping device, wherein the second pumping device is at a predetermined height so that the pumping port is located at the bottom of the surface floating layer after the predetermined mixed material is mixed, wherein the chamber is provided with a feeding port, thereby sucking the floating layer through the second pumping device.

[0019] Optionally, the number of cycles of the circulating water washing-pumping treatment is 2-5 times.

[0020] Optionally, when the parameters deviate from the preset values, the master control device controls to stop the running devices among the rotatable device, the screen, the flotation machine, the ball mill, the first pumping device, the ultrasonic device and the heating device for maintenance.

[0021] Optionally, the dried material is sent to a sifter for screening via a piston pusher.

[0022] Optionally, the calcination temperature is 120-200°C.

[0023] Optionally, the method of performing real-time preprocessing process control using a pre-trained large model according to the transmitted operating parameters includes:

[0024] Q1 inputs historical parameters into the big model to make real-time judgments on whether there are abnormalities at each moment in history, as well as the parameters and process strategies of each device at the next moment;

[0025] Q2 uses abnormal and normal data judgment training to enable the large model to predict and output the normal range of each device parameter at each moment, so as to monitor the abnormal comparison between the predicted data and the actual parameters;

[0026] Q3 inputs the transmitted operating parameters into the pre-trained large model to predict in real time whether the current parameters are normal, as well as the parameters and process strategies of each device at the next moment. Beneficial effects

[0027] Through specially designed processing chambers, screens, flotation machines, and master control equipment with large-scale model prediction, a relatively low-cost and efficient intelligent pretreatment process for small batches of phosphogypsum is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 A schematic diagram of a production line used in a method for pretreating phosphogypsum for producing gypsum board according to the present invention.

[0029] Figure 2 Schematic diagram of the detailed structure of the processing chamber.

[0030] Figure 3 Schematic diagram of the double-layer casing structure of the processing chamber,

[0031] Figure 4 Schematic diagram of the mobile vehicle structure.

[0032] Figure 5 Schematic diagram of the structure of the screener.

[0033] Figure 6 Schematic diagram of the flotation machine structure.

[0034] Figure 7 Schematic diagram of the principle of using a pre-trained large model to perform real-time preprocessing process control, where the figure is marked,

[0035] 1. Ultrasonic device, 2. Heating device, 3. First flange, 4. Second flange, 5. First pumping device, 6. General control device, 7. Rotatable device, 8. Driven gear, 9. Driving gear, 10. Motor, 11. Screen, 12. Flotation machine, 13. Ball mill, 14. Motor with stirring paddle, 15. Stirring paddle, 16. Feeding port, 17. Second pumping device, A, B, and C are shaking tables equipped with sorting membranes of different mesh sizes, respectively. a, b, and c are the first to third conveyor belts, respectively. DETAILED DESCRIPTION

[0036] like Figure 1 As shown, a method for pretreating phosphogypsum for producing gypsum board includes adopting the following production line:

[0037] Including the exhaust valve ( Figure 2 ) processing chamber, screener 11, first conveyor belt a, flotation machine 12, second conveyor belt b, ball mill 13, third conveyor belt c, the first conveyor belt a conveys the phosphogypsum that has been screened to the flotation machine 11 for flotation, the second conveyor belt b conveys the phosphogypsum that has been flotated to the ball mill 13 for ball milling, and the third conveyor belt c leads to the processing chamber for calcination.

[0038] like Figure 2 As shown, the treatment chamber is provided with a first flange 3 and a second flange 4 at each end. The first flange 3 has two ports for respectively introducing deionized water and reagents, which are respectively contained in tanks controlled by a master control device 6. The second flange 4 is connected to a first pumping device 5 via a pipeline. Multiple ultrasonic devices 1 and multiple heating devices 2 are provided along the length of the treatment chamber, connected by connecting rods. These devices, respectively, closely adhere to the surface of the treatment chamber and transmit ultrasonic waves and heat into the interior of the treatment chamber. These devices are used for vibration-enhanced treatment effects during water washing and neutralization, as well as for calcination. The rotatable device, screen 11, flotation machine 12, ball mill 13, first pumping device 5, ultrasonic devices 1, and heating devices 2 are all connected to a master control device 6 for real-time pretreatment process control using a pretrained large model based on transmitted operating parameters.

[0039] Among them, Figure 3 As shown, the processing chamber is a tubular double-layer casing with stainless steel outside and corundum inside. The stainless steel is used for heat transfer, and the corundum is used for carrying phosphogypsum and calcining high temperature resistance, and both can transmit ultrasonic waves.

[0040] like Figure 4 As shown, the operation of clinging and moving away is performed by using a fixed support connecting rod of the mobile vehicle, wherein the connecting rod has a universal joint and rotates with the rotatable device 7. The fixed support connecting rod is fixed to the mobile vehicle body.

[0041] like Figure 1 Specifically, the rotatable device 7 can be composed of a driven gear 8 disposed on a base and having a rotating shaft passing through it, and a driving gear 9 disposed on the output end of a motor 10 controlled by a master control device 6, which drives the driven gear 8 to rotate. Thus, when the motor 10 is started, the processing chamber can rotate like a seesaw, thereby making the ultrasonic mixing of the material with the deionized water or reagent more rapid and uniform.

[0042] like Figure 5 As shown, the sieving device 11 comprises a housing and three shakers C, B, and A arranged from bottom to top within the housing. Each layer of shakers C, B, and A is equipped with a sorting membrane with successively smaller and larger mesh sizes. When dried material is placed into the housing, all three shakers are simultaneously activated by the master control device 6. Impurities of varying fineness are filtered through the sorting membranes on the three shakers and then sieved onto the first conveyor belt for transport.

[0043] like Figure 6 As shown, the flotation machine 12 includes a chamber, a motor 14 with a stirring paddle 15, and a second pumping device 17. The chamber is also provided with a feed port 16. The second pumping device 17 is positioned at a predetermined height, allowing the pumping port to be located at the bottom of the surface layer after the predetermined mixture is mixed. This allows pumping to proceed from the bottom of the surface layer until the surface layer is completely drained, completing the flotation process.

[0044] like Figure 7 As shown, the method for performing real-time preprocessing process control using a pre-trained large model based on the transmitted operating parameters includes:

[0045] Q1 inputs historical parameters into the large model and uses the softmax function to determine whether there is an anomaly at each moment in the history, as well as the parameters and process strategies of each device at the next moment;

[0046] Q2 uses training to judge abnormal and normal data, so that the large model predicts and outputs the normal range of each device parameter at each moment (generally required to be within a 0.1% error range, and this range decreases as the processing volume increases). This can be used to monitor abnormalities between the predicted data and the actual parameters.

[0047] Q3 inputs the transmitted operating parameters into the pre-trained large model to predict in real time whether the current parameters are normal, as well as the parameters and process strategies of each device at the next moment.

[0048] The method specifically includes:

[0049] S1 raw materials are loaded into the processing chamber, and after the first flange 3 and the second flange 4 are installed, the master control device controls the operation of the rotatable device 7 and the ultrasonic device 1, and controls the deionized water to enter the processing chamber for three cycles of water washing and water pumping until the water washing is complete.

[0050] After the last pumping of water in S2 is completed, the master control device controls the reagent to enter the processing chamber for neutralization, and finally pumps water, turns off the ultrasonic device 1, and starts the heating device 2 for drying.

[0051] S3 removes the first flange 3 and the second flange 4, using Figure 1 The piston pusher shown pushes the dried material out and sends it to the screener 11 for screening. The piston pusher can quickly and cleanly scrape out the material sticking to the wall, thereby reducing material loss.

[0052] S4 The first conveyor belt a sends the screened material to the flotation machine 12 for flotation.

[0053] S5 The second conveyor belt b conveys the flotation material after flotation to the ball mill 13,

[0054] S6 The third conveyor belt c carries the ball mill material to the processing chamber, where the material is loaded and the heating device 2 is started to calcine at 170°C.

Claims

1. A method for pretreating phosphogypsum for producing gypsum board, characterized in that: The method comprises adopting the following production line: The invention comprises a processing chamber with an exhaust valve, a screener, a first conveyor belt, a flotation machine, a second conveyor belt, a ball mill, and a third conveyor belt, which are sequentially arranged on a rotatable device. The first conveyor belt conveys the phosphogypsum that has been screened to the flotation machine, the second conveyor belt conveys the phosphogypsum that has been flotated to the ball mill, and the third conveyor belt leads to the processing chamber for further calcination. A first flange and a second flange are respectively provided at both ends of the processing chamber, the first flange having a port for introducing deionized water and reagents, and the second flange is connected to a first pumping device via a pipeline. An ultrasonic device and a heating device are provided on both sides of the length direction of the processing chamber to respectively transmit ultrasonic waves and heat to the interior of the processing chamber in close contact with the surface of the processing chamber, respectively, for vibration enhancement treatment effects in water washing and neutralization treatment, as well as calcination. The rotatable device, screen, flotation machine, ball mill, first pumping device, ultrasonic device and heating device are connected to a master control device for performing real-time pretreatment process control using a pre-trained large model based on the transmitted operating parameters; specifically comprising: S1 raw materials are loaded into the processing chamber, and after the first flange and the second flange are installed, the master control equipment controls the operation of the rotatable device and the ultrasonic device, and controls the deionized water to enter the processing chamber for circulating water washing and pumping treatment. After the last pumping of water in S2 is completed, the master control device controls the reagent to enter the treatment chamber for neutralization, and finally pumps water, turns off the ultrasonic device, and starts the heating device for drying; S3 removes the first and second flanges and sends the dried material into the sifter for screening. The first conveyor belt of S4 sends the screened materials to the flotation machine for flotation. The second conveyor belt S5 conveys the flotation material after flotation into the ball mill for ball milling. S6 The third conveyor brings the ball mill material to the processing chamber, loads the material and starts the heating device for calcination.

2. The method according to claim 1, characterized in that The processing chamber is a tubular double-layer casing with stainless steel on the outside and corundum on the inside. The rotatable device includes a base for supporting the middle part of the processing chamber. The base has a shaft with a driven gear passing through it. The driven gear engages with the driving gear at the output end of the motor, and the motor is connected to the master control device.

3. The method according to claim 2, characterized in that The exhaust valve is connected to an air pressure measuring device of the master control device.

4. The method according to claim 3, characterized in that Deionized water and reagents are respectively contained in supply tanks controlled by the master control equipment.

5. The method according to any one of claims 1 to 4, characterized in that There are multiple ultrasonic devices and heating devices, each connected by a connecting rod, so that a mobile vehicle can be used to fix and support the connecting rod to perform the operations of close contact and removal. The connecting rod has a universal joint and rotates with the rotatable device.

6. The method according to claim 5, characterized in that The screener includes a shell and a plurality of shaking tables arranged vertically in the shell, each layer of shaking tables is provided with a sorting membrane with a mesh size decreasing from top to bottom, and the first conveyor belt is located under the bottom layer of shaking tables; the flotation machine includes a cavity, a motor with a stirring paddle, and a second pumping device, the height of the second pumping device is preset, and after the preset mixture is mixed, the pumping port can be located at the bottom of the surface floating layer, wherein the cavity is provided with a feeding port.

7. The method according to claim 6, characterized in that The number of cycles of the circulating water washing-pumping treatment is 2-5 times.

8. The method according to claim 7, characterized in that When the parameters deviate from the preset values, the master control device controls to stop the running devices among the rotatable device, the screen, the flotation machine, the ball mill, the first pumping device, the ultrasonic device and the heating device for maintenance.

9. The method according to claim 8, characterized in that The dried material is sent to a sifter for screening through a piston pusher; the calcination temperature is 120-200°C.

10. The method according to any one of claims 6 to 9, characterized in that The method for performing real-time preprocessing process control using a pre-trained large model based on the transmitted operating parameters includes: Q1 inputs historical parameters into the big model to make real-time judgments on whether there are abnormalities at each moment in history, as well as the parameters and process strategies of each device at the next moment; Q2 uses abnormal and normal data judgment training to enable the large model to predict and output the normal range of each device parameter at each moment, so as to monitor the abnormal comparison between the predicted data and the actual parameters; Q3 inputs the transmitted operating parameters into the pre-trained large model to predict in real time whether the current parameters are normal, as well as the parameters and process strategies of each device at the next moment.

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