Apparatus and Method for Preparing Polyaluminum Chloride from Coal Gangue

Abstract

This invention provides an apparatus and method for preparing polyaluminum chloride from coal gangue, belonging to the field of polyaluminum chloride preparation technology. It includes a calcining box and a mixing tank, connected by an inlet. An electric telescopic rod is installed on the right side of the upper surface of the mixing tank, with a mounting block at its upper end. Through the arrangement of a U-shaped plate, rotating rod, vertical plate, scraper, horizontal plate, and brush, the scraper agitates the bottom of the mixing tank when larger pieces of coal gangue react with hydrochloric acid solution, improving the reaction efficiency. When the larger pieces of coal gangue become smaller during the reaction, the scraper and brush switch, with the brush agitating the bottom of the mixing tank to agitate the smaller pieces, further improving the reaction efficiency. This also avoids the scraper constantly contacting the bottom of the mixing tank, preventing severe wear on the scraper and mixing tank, thus extending their service life.

Description

Technical Field

[0001] This invention belongs to the field of polyaluminum chloride preparation technology, specifically an apparatus and method for preparing polyaluminum chloride using coal gangue. Background Technology

[0002] The main mineral component of coal gangue is kaolinite (Al₂O₃·2SiO₂·2H₂O), a 1:1 type clay mineral composed of silicon-oxygen tetrahedra and aluminum-oxygen octahedra, with common oxygen atoms connecting the layers to form unit cells. Kaolinite clay particles are formed by the overlapping of unit cells along the axial direction and extending along the axial direction. Between the unit cells, hydrogen-oxygen layers and oxygen layers are opposite each other, forming strong hydrogen bonds, resulting in tight intercellular bonding and making them difficult to disperse.

[0003] Studies have shown that finely ground fresh gangue has weak cementing properties, while calcined coal gangue exhibits pozzolanic activity. We used scanning electron microscopy and infrared spectroscopy to track and measure the activation process of coal gangue. The results showed that the structure of calcined coal gangue was generally loose. During high-temperature calcination, coal gangue underwent structural expansion and component volatilization. Its structure corresponds to an amorphous structure with high micropores, multiple broken bonds, and many soluble substances (such as SiO2, Al2O3), and higher internal energy (containing crystals), thus exhibiting good pozzolanic activity. Simultaneously, during calcination, crystalline kaolinite transforms into amorphous metakaolinite (Al2O3·2SiO2) due to the removal of hydroxyl groups. Metakaolinite has a large specific surface area and high chemical reactivity. The chemical equation for the acid leaching reaction is:

[0004]

[0005]

[0006] Kaolinite can form highly active metakaolinite at 600-800℃, but as the temperature continues to rise, new mullite and cristobalite crystals are formed, and the activity decreases.

[0007] However, in the preparation of polyaluminum chloride from coal gangue, the acid leaching reaction requires the coal gangue to react with acidic solutions such as hydrochloric acid. However, the existing mixing equipment does not easily stir the coal gangue during the stirring process of the coal gangue and hydrochloric acid solution, causing the coal gangue to easily settle at the bottom of the mixing tank, which affects the reaction rate and reaction quality.

[0008] Therefore, we propose an apparatus and method for preparing polyaluminum chloride using coal gangue to solve the problems encountered above. Summary of the Invention

[0009] The purpose of this invention is to solve the problem in the existing process of preparing polyaluminum chloride from coal gangue, in which one step is an acid dissolution reaction that requires reacting coal gangue with hydrochloric acid solution. However, existing mixing equipment does not easily agitate the coal gangue during the stirring of the coal gangue and hydrochloric acid solution, causing the coal gangue to easily settle at the bottom of the mixing tank, affecting the reaction rate and reaction quality. Therefore, this invention proposes an apparatus and method for preparing polyaluminum chloride from coal gangue.

[0010] The objective of this invention can be achieved through the following technical solution: It includes a roasting box and a mixing tank, connected by an inlet. An electric telescopic rod is provided on the right side of the upper surface of the mixing tank. An mounting block is provided at the upper end of the electric telescopic rod. A lifting rod is rotatably mounted on the lower left side of the mounting block. A lifting block is provided at the lower end of the lifting rod, and the lifting block is located inside the mixing tank. A U-shaped plate is movably connected to the side wall of the lifting block. A rotating rod is rotatably mounted inside the U-shaped plate. Hollow sleeve rods are provided on the circumferential surfaces of both sides of the rotating rod. The lower... Each surface is provided with a vertical plate, and a scraper is provided at the lower end of the vertical plate. A horizontal plate is provided at the rear side of each of the two sets of hollow sleeve rods, and a brush is provided at the rear side of the horizontal plate. A connecting block is provided at the end of each of the two sets of vertical plates away from the lifting block. A scraper is provided at the lower end of each of the two sets of connecting blocks. A brush is provided at the side of the connecting block away from the vertical plate. A brush is provided at the rear side of the connecting block. A driven gear is provided on the circumferential surface in the middle of the rotating rod. A connecting plate is meshed with the front end of the driven gear, and the upper end of the connecting plate is connected to the lifting block. A brush is provided at the lower end of the connecting plate.

[0011] In a preferred embodiment of the present invention, the lower ends of the two sets of scraper one, the two sets of scraper two, and the four brushes are all in contact with the inner bottom wall of the mixing tank, and the two sets of brushes are all in contact with the side wall of the bottom of the mixing tank.

[0012] In a preferred embodiment of the present invention, a stirring mechanism is provided inside the mixing tank. The stirring mechanism includes a rotary motor, which is mounted on the left side of the upper surface of the mixing tank via a support column. A rotating gear two is provided on the circumferential surface of the motor shaft of the rotary motor. A driven gear two is meshed with the right side of the rotating gear two. A rotating shaft three is provided in the middle of the driven gear two and is rotatably mounted inside the mixing tank. The lower end of the rotating shaft three is fixedly connected to the upper surface of the C-shaped plate. A stirring rod is provided on the circumferential surface of the rotating shaft three.

[0013] In a preferred embodiment of the present invention, the upper part of the lifting rod is slidably mounted inside the rotating shaft three via a cross-shaped limiting block, the lower end of the rotating shaft three is provided with a lifting groove, and the upper part of the lifting block is disposed inside the lifting groove.

[0014] In a preferred embodiment of the present invention, a crushing mechanism is provided inside the upper end of the roasting box. The crushing mechanism includes a servo motor, which is mounted on the rear outer wall of the roasting box via a motor mount. The power output end of the servo motor is connected to a rotating shaft. A rotating gear is provided on the circumferential surface of the front end of the rotating shaft. A driven gear is meshed with the right side of the rotating gear. A rotating shaft is provided on the rear side of the driven gear. Crushing rollers are provided on the circumferential surfaces of the middle parts of both the rotating shaft and the rotating shaft.

[0015] In a preferred embodiment of the present invention, the roasting box is provided with a partition, which is located below the crushing roller and to the left of the feed inlet.

[0016] In a preferred embodiment of the present invention, an opening and closing mechanism is provided on the right side of the partition. The opening and closing mechanism includes a lifting cylinder, which is located below the roasting box. A sealing plate is provided at the upper end of the lifting cylinder, and a connecting plate is provided at the upper end of the sealing plate. A sealing plate is provided on the upper surface of the connecting plate. The upper end of the sealing plate is tightly fitted with the upper part of the feed inlet. An abutment plate is provided on the left side of the sealing plate. The upper surface of the abutment plate abuts against the lower surface of the right end of the partition.

[0017] In a preferred embodiment of the present invention, the right side wall of the roasting box is provided with a movable groove 1 and a movable groove 2, and the movable groove 1 and the movable groove 2 are connected. The movable groove 1 and the movable groove 2 are both located below the feed inlet. The lower end of the sealing plate 1 is located inside the movable groove 1, the upper end of the sealing plate 1 is located inside the movable groove 2, and the lower end of the sealing plate 2 is located inside the movable groove 2.

[0018] In a preferred embodiment of the present invention, the upper end of the roasting box is provided with a feed inlet, the right end of the upper surface of the mixing tank is provided with a liquid injection port, the lower right end of the mixing tank is provided with a liquid outlet, and the left end of the liquid outlet is provided with a filter screen. The lower right end of the mixing tank is provided with a solid material outlet, and valves are provided inside both the liquid outlet and the solid material outlet.

[0019] As a preferred embodiment of the present invention, the method for preparing polyaluminum chloride using coal gangue specifically includes the following steps:

[0020] Step 1: First, high-quality coal gangue is fed into the roasting box through the feed inlet. The servo motor is started, and the servo motor drives the rotating shaft 1 and rotating gear 1 to rotate. The rotating gear 1 drives the driven gear 1 and rotating shaft 2 to rotate, which in turn causes the crushing rollers on rotating shaft 1 and rotating shaft 2 to rotate, crushing the coal gangue into a finer state, which is convenient for subsequent roasting. The crushed coal gangue falls onto the partition plate. Then, the heating equipment inside the roasting box works, so that the coal gangue on the partition plate is roasted at high temperature for one hour.

[0021] Step 2: Inject hydrochloric acid solution into the mixing tank through the injection port. After the coal gangue is roasted, start the lifting cylinder. The lifting cylinder moves the sealing plate 1, connecting plate 1, sealing plate 2 and abutment plate downward, so that the sealing plate 2 opens the left side of the feed port. Then the roasted coal gangue on the partition falls into the mixing tank through the feed port.

[0022] Step 3: Start the rotary motor. The rotary motor drives the rotating gear two to rotate, which in turn drives the driven gear two and the rotating shaft three to rotate. The rotating shaft three then drives the stirring rod and the C-shaped plate to rotate. The rotation of the stirring rod can stir the solution inside the mixing tank, allowing the coal gangue to react quickly with the hydrochloric acid. The rotation of the C-shaped plate can drive the scraper one and scraper two inside it to rotate, so that the scraper one and scraper two can stir up the coal gangue that has settled at the bottom of the mixing tank, preventing the coal gangue from settling and affecting the reaction time and reaction quality.

[0023] Step 4: After the coal gangue reacts with hydrochloric acid for a period of time, the larger coal gangue pieces become smaller. Then, the electric telescopic rod is activated. The electric telescopic rod drives the mounting block and lifting rod to move upward. The lifting rod drives the lifting block and connecting plate 2 to move upward a certain distance, causing the connecting plate 2 to drive the driven gear 3 to rotate 90 degrees. Then, the driven gear 3 drives the rotating rod to rotate 90 degrees, causing the vertical plate and scraper 1 to rotate to the horizontal position, and the horizontal plate and brush 1 to rotate to the vertical position. Brush 1 contacts the bottom of the mixing tank. At this time, when the rotating shaft 3 rotates, brush 1 stirs the bottom of the mixing tank, which can stir up the fine coal gangue that has settled at the bottom, avoiding greater wear when the scraper is continuously scraping, and improving the service life of the scraper.

[0024] Step 5: After the coal gangue and hydrochloric acid solution have completely reacted to form an aluminum chloride solution, the mixing tank is heated at high temperature to evaporate and concentrate the aluminum chloride solution, causing it to crystallize. Then, the valve inside the liquid outlet is opened to discharge any trace amounts of water or incompletely evaporated solution that may remain inside the mixing tank. Next, the valve inside the solid material outlet is opened to allow the crystals to be discharged and collected from the solid material outlet. Then, in a fluidized bed reactor, the crystallized aluminum chloride is heated to partially decompose it into granular polymeric monomers with a certain degree of alkalinity. An appropriate amount of water is added to the treated solution for further treatment, at which point resinous solid polyaluminum chloride can be generated.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0026] (1) By setting up the C-shaped plate, rotating rod, vertical plate, scraper one, horizontal plate and brush one, when larger coal gangue reacts with hydrochloric acid solution, the scraper pair can stir the bottom of the mixing tank, which can stir up the larger coal gangue and improve the reaction effect. When the larger coal gangue becomes smaller due to the reaction process, the scraper one and brush one are switched. At this time, the brush pair stirs the bottom of the mixing tank, which can stir up the smaller coal gangue and improve the reaction effect. At the same time, it avoids the scraper from constantly contacting the bottom of the mixing tank, which would cause serious wear on the scraper and the mixing tank, and improves the service life of the scraper and the mixing tank.

[0027] (2) By using scraper two, brush two and brush three, the bottom edge of the mixing tank can be stirred, which avoids the difficulty of stirring the edge of the tank by existing stirring equipment, so that the material settled on the edge of the tank can also be stirred smoothly, thus improving the reaction quality. Attached Figure Description

[0028] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0029] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0030] Figure 2 This is a perspective view of the present invention.

[0031] Figure 3 This is a three-dimensional structural diagram of the stirring mechanism of the present invention;

[0032] Figure 4 This is a left sectional perspective view of the inverted plate of the present invention;

[0033] Figure 5 This is a first partial perspective view of the hollow sleeve of the present invention;

[0034] Figure 6 This is a second partial perspective view of the hollow sleeve of the present invention;

[0035] Figure 7 This is a cross-sectional perspective view of the roasting box of the present invention;

[0036] Figure 8 This is a three-dimensional structural diagram of the crushing mechanism of the present invention;

[0037] Figure 9 This is a three-dimensional structural diagram of the opening and closing mechanism of the present invention;

[0038] Figure 10 This is a flow chart of the polyaluminum chloride preparation process of the present invention.

[0039] In the diagram: 1. Roasting box; 2. Crushing mechanism; 201. Servo motor; 202. Shaft 1; 203. Rotating gear 1; 204. Driven gear 1; 205. Shaft 2; 206. Crushing roller; 3. Partition plate; 4. Feed inlet; 5. Opening and closing mechanism; 501. Lifting cylinder; 502. Sealing plate 1; 503. Connecting plate 1; 504. Sealing plate 2; 505. Abutment plate; 6. Mixing tank; 7. Stirring mechanism; 701. Rotary motor; 702. Rotating gear 2; 703. Driven gear 2; 704. Shaft 3; 705. Stirring rod; 8. C-shaped plate; 9. Rotating rod; 10. Hollow sleeve rod; 11. Vertical plate; 12. Scraper 1; 13. Horizontal plate; 14. Brush 1; 15. Connecting block; 16. Scraper 2; 17. Brush 2; 18. Brush 3; 19. Electric telescopic rod; 20. Mounting block; 21. Lifting rod; 22. Cross limit block; 23. Lifting block; 24. Connecting plate 2; 25. Brush 4; 26. Driven gear 3; 27. Feed inlet; 28. Movable trough 1; 29. ​​Movable trough 2; 30. Liquid injection port; 31. Liquid outlet; 32. Solid material outlet; 33. Lifting trough. Detailed Implementation

[0040] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] Process flow diagram for the preparation of polyaluminum chloride

[0042] Solid polyaluminum chloride is produced by hydrolysis and polymerization of coal gangue from coal preparation plants as raw material. The mixture is calcined at high temperature, dissolved in hydrochloric acid, and then alkalized with an alkalizing agent and a small amount of catalyst. The reaction process is as follows: Figure 10 .

[0043] in Figure 10 middle: High-temperature calcination Acid dissolution reaction Hydrolysis-polymerization reaction

[0044] The chemical equation for the reaction is as follows:

[0045] Acid dissolution reaction:

[0046] Al₂O₃ + 3HCl = AlCl₃ + 3H₂O

[0047] Hydrolysis reaction:

[0048] AlCl3 + nH2O = Al2(OH) n Cl 3-n / 2 +nHCl

[0049] Polymerization reaction:

[0050] m[Al2(OH) n Cl 3-n / 2 ]=[Al2(OH) n Cl 3-n / 2 ]m

[0051] Example 1:

[0052] Please see Figure 1 - Figure 9As shown, the apparatus for preparing polyaluminum chloride using coal gangue includes a roasting box 1 and a mixing tank 6. The roasting box 1 has a feed inlet 27 at its upper end, which facilitates the feeding of coal gangue into the roasting box 1. The mixing tank 6 has a liquid injection port 30 at its right end on its upper surface, which facilitates the injection of hydrochloric acid solution into the mixing tank 6. The roasting box 1 and the mixing tank 6 are connected by a feed inlet 4, allowing the roasted coal gangue to flow into the mixing tank 6 through the feed inlet 4. An electric telescopic rod 19 is installed on the right side of the upper surface of the mixing tank 6, and a mounting block 20 is installed at the upper end of the electric telescopic rod 19. A lifting rod 21 is rotatably mounted on the lower left side of block 20. A lifting block 23 is provided at the lower end of the lifting rod 21, and the lifting block 23 is located inside the mixing tank 6. A U-shaped plate 8 is movably connected to the side wall of the lifting block 23. A rotating rod 9 is rotatably mounted inside the U-shaped plate 8. Hollow sleeve rods 10 are provided on the circumferential surfaces of both sides of the rotating rod 9. Vertical plates 11 are provided on the lower surfaces of both sets of hollow sleeve rods 10, and scrapers 12 are provided at the lower ends of the vertical plates 11. Horizontal plates 13 are provided on the rear sides of both sets of hollow sleeve rods 10, and brushes 14 are provided on the rear sides of the horizontal plates 13. Connecting blocks 15 are provided at the ends of both sets of vertical plates 11 away from the lifting block 23. Scraper 2 16 is provided at the lower end of 5. Brush 2 17 is provided on the side of the connecting block 15 away from the vertical plate 11. Brush 3 18 is provided on the rear side of the connecting block 15. Driven gear 3 26 is provided on the circumferential surface of the middle of the rotating rod 9. The front end of the driven gear 3 26 is meshed with the connecting plate 24. The upper end of the connecting plate 24 is connected to the lifting block 23. Brush 4 25 is provided at the lower end of the connecting plate 24. The lower ends of the two sets of scraper 1 12, the two sets of scraper 2 16 and brush 4 25 are all in contact with the inner bottom wall of the mixing tank 6. When the rotating shaft 3 704 drives the U-shaped plate 8 and the scraper to rotate, scraper 1 12 and scraper 2 16 can remove the coal gangue that has settled at the bottom of the mixing tank 6. The coal gangue is stirred, causing it to react quickly with the hydrochloric acid solution. Both sets of brushes 17 abut against the side wall at the bottom of the mixing tank 6. The upper part of the lifting rod 21 is slidably installed inside the rotating shaft 704 via the cross limit block 22. The cross limit block 22 allows the lifting rod 21 to rotate synchronously when the rotating shaft 704 rotates, thereby enabling the lifting rod 21 to rotate synchronously with the C-shaped plate 8. The lower end of the rotating shaft 704 has a lifting groove 33. The upper part of the lifting block 23 is located inside the lifting groove 33. The lifting groove 33 provides space for the lifting block 23 to move, allowing it to move smoothly in the vertical direction.

[0053] It should be noted that when the lifting block 23 moves upward to the upper end of the lifting groove 33, the lifting block 23 drives the connecting plate 24 to move upward by a certain distance, so that the connecting plate 24 can drive the driven gear 3 26 to rotate 90 degrees, so that the driven gear 3 26 drives the rotating rod 9 and the hollow sleeve rod 10 to rotate 90 degrees, thereby allowing the vertical plate 11 to rotate to the front of the hollow sleeve rod 10 and be in a horizontal state. At the same time, the horizontal plate 13 rotates to the bottom of the hollow sleeve rod 10 and is in a vertical state. After the lifting rod 21 moves upward, the cross limit block 22 below it will not completely move out of the rotating shaft 3 704, so that the rotating shaft 3 704 always drives the lifting rod 21 to rotate through the cross limit block 22.

[0054] The upper end of the roasting box 1 is provided with a crushing mechanism 2. The crushing mechanism 2 includes a servo motor 201, which is mounted on the rear outer wall of the roasting box 1 via a motor base. The power output end of the servo motor 201 is connected to a rotating shaft 202 via a coupling. A rotating gear 203 is provided on the circumferential surface of the front end of the rotating shaft 202. A driven gear 204 is meshed on the right side of the rotating gear 203. The rotating gear 203 and the driven gear 204 are both located outside the roasting box 1 and in front of the roasting box 1. A rotating shaft 205 is provided on the rear side of the driven gear 204. Crushing rollers 206 are provided on the circumferential surfaces of the middle part of the rotating shaft 202 and the rotating shaft 205. A partition 3 is provided inside the roasting box 1, and the partition 3 is located below the crushing rollers 206. The partition 3 is located on the left side of the feed inlet 4.

[0055] It should be noted that the feed inlet 27 is located directly above the junction of the two sets of crushing rollers 206, so that when the coal gangue enters the roasting box 1 through the feed inlet 27, it can fall at the junction of the two sets of crushing rollers 206, so that the coal gangue can be crushed smoothly when the two sets of crushing rollers 206 rotate.

[0056] A closing mechanism 5 is provided on the right side of the partition 3. The closing mechanism 5 includes a lifting cylinder 501, which is located below the roasting chamber 1. A sealing plate 502 is provided at the upper end of the lifting cylinder 501. A connecting plate 503 is provided at the upper end of the sealing plate 502. A second sealing plate 504 is provided on the upper surface of the connecting plate 503. The upper end of the second sealing plate 504 is tightly fitted to the upper part of the feed inlet 4. An abutment plate 505 is provided on the left side of the second sealing plate 504. The upper surface of the abutment plate 505 abuts against the lower surface of the right end of the partition 3. The right side wall of the roasting chamber 1 is open. The device is provided with a first movable groove 28 and a second movable groove 29, which are connected to each other. Both the first movable groove 28 and the second movable groove 29 are located below the feed inlet 4. The lower end of the first sealing plate 502 is located inside the first movable groove 28, and the upper end of the first sealing plate 502 is located inside the second movable groove 29. The lower end of the second sealing plate 504 is located inside the second movable groove 29. The arrangement of the first movable groove 28 and the second movable groove 29 provides space for the first sealing plate 502 and the second sealing plate 504 to move smoothly in the vertical direction.

[0057] It should be noted that the abutment plate 505 is designed to abut against the bottom of the partition plate 3 when the sealing plate 2 504 closes the inlet 4, allowing the operator to know that the sealing plate 2 504 has moved upward to its limit and completed the sealing of the inlet 4. When the sealing plate 2 504 moves downward to open the inlet 4, the abutment plate 505 limits the downward movement of the sealing plate 2 504, preventing the sealing plate 2 504 from moving too much and creating a gap between the sealing plate 2 504 and the partition plate 3. This would cause some of the coal gangue to flow into the bottom of the roasting box 1 through the gap during the process of the coal gangue falling into the mixing tank 6 through the inlet 4.

[0058] The mixing tank 6 is equipped with a stirring mechanism 7, which includes a rotary motor 701. The rotary motor 701 is mounted on the left side of the upper surface of the mixing tank 6 via a support column. A rotating gear 702 is provided on the circumferential surface of the motor shaft of the rotary motor 701. A driven gear 703 is meshed with the right side of the rotating gear 702. A rotating shaft 704 is provided in the middle of the driven gear 703. The rotating shaft 704 is rotatably mounted inside the mixing tank 6. The lower end of the rotating shaft 704 is fixedly connected to the upper surface of the C-shaped plate 8, so that the C-shaped plate 8 can be smoothly driven to rotate when the rotating shaft 704 rotates. A stirring rod 705 is provided on the circumferential surface of the rotating shaft 704.

[0059] The mixing tank 6 has a liquid outlet 31 at the lower right end, and a filter screen is installed inside the left end of the liquid outlet 31. The filter screen can block the crystals when the liquid is discharged, preventing the crystals from being discharged with the liquid. The mixing tank 6 has a solid material outlet 32 ​​at the lower right end, which can discharge and collect the crystals for subsequent work. Both the liquid outlet 31 and the solid material outlet 32 ​​are equipped with valves.

[0060] Example 2:

[0061] Please refer to the following: Figure 1 - Figure 3 and Figure 7 As shown, the present invention also discloses a method for preparing polyaluminum chloride using coal gangue, which specifically includes the following steps;

[0062] Step 1: First, high-quality coal gangue is fed into the roasting chamber 1 through the feed inlet 27. The servo motor 201 is started, and the servo motor 201 drives the rotating shaft 202 and the rotating gear 203 to rotate. The rotating gear 203 drives the driven gear 204 and the rotating shaft 205 to rotate, which in turn causes the crushing rollers 206 on the rotating shaft 202 and the rotating shaft 205 to rotate, crushing the coal gangue into a finer state, which is convenient for subsequent roasting. The crushed coal gangue falls onto the partition plate 3. Then, the heating equipment inside the roasting chamber 1 is activated, so that the coal gangue on the partition plate 3 is roasted at a high temperature (such as 700℃) for one hour.

[0063] Step 2: Inject hydrochloric acid solution into the mixing tank 6 through injection port 30. After the coal gangue is roasted, start the lifting cylinder 501. The lifting cylinder 501 drives the sealing plate 502, connecting plate 503, sealing plate 504 and abutment plate 505 to move downward, so that the sealing plate 504 opens the left side of the feed port 4. Then the roasted coal gangue on the partition plate 3 falls into the mixing tank 6 through the feed port 4.

[0064] Step 3: Start the rotary motor 701. The rotary motor 701 drives the rotating gear 702 to rotate, which in turn drives the driven gear 703 and the rotating shaft 704 to rotate. The rotating shaft 704 drives the stirring rod 705 and the C-shaped plate 8 to rotate. The rotation of the stirring rod 705 can stir the solution inside the mixing tank 6, so that the coal gangue reacts with hydrochloric acid quickly. The rotation of the C-shaped plate 8 can drive the scraper 12 and scraper 26 inside it to rotate, so that the scraper 12 and scraper 26 can stir up the coal gangue that has settled at the bottom of the mixing tank 6, so as to avoid the coal gangue settling and affect the reaction time and reaction quality.

[0065] Step 4: After the coal gangue reacts with hydrochloric acid for a period of time, the larger coal gangue pieces become smaller. Then, the electric telescopic rod 19 is activated. The electric telescopic rod 19 drives the mounting block 20 and the lifting rod 21 to move upward. The lifting rod 21 drives the lifting block 23 and the connecting plate 24 to move upward a certain distance, so that the connecting plate 24 drives the driven gear 3 26 to rotate 90 degrees. Then, the driven gear 3 26 drives the rotating rod 9 to rotate 90 degrees, so that the vertical plate 11 and the scraper 12 rotate to the horizontal position, and the horizontal plate 13 and the brush 14 rotate to the vertical position. The brush 14 contacts the bottom of the mixing tank 6. At this time, when the rotating shaft 3 704 rotates, the brush 14 stirs the bottom of the mixing tank 6, which can stir up the small coal gangue that has settled at the bottom, avoiding large wear caused by the scraper during continuous scraping work and improving the service life of the scraper.

[0066] Step 5: After the coal gangue and hydrochloric acid solution have completely reacted to form an aluminum chloride solution, the mixing tank 6 is heated at high temperature to evaporate and concentrate the aluminum chloride solution, causing it to crystallize. Then, the valve inside the liquid outlet 31 is opened to discharge any trace amounts of water or incompletely evaporated solution that may remain inside the mixing tank 6. Next, the valve inside the solid material outlet 32 ​​is opened to allow the crystals to be discharged and collected from the solid material outlet 32. Then, in the fluidized bed reactor, the crystallized aluminum chloride is heated to partially decompose it into granular polymer monomers with a certain degree of alkalinity. An appropriate amount of water is added to the treated solution for further treatment, at which point resinous solid polyaluminum chloride can be generated.

[0067] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A device for preparing polyaluminum chloride by using coal gangue, comprising a calcination box (1) and a mixing tank (6), the calcination box (1) and the mixing tank (6) are connected through a feeding port (4), characterized in that, The right side of the upper surface of the mixing tank (6) is provided with an electric telescopic rod (19), the upper end of the electric telescopic rod (19) is provided with a mounting block (20), the lower end of the left side of the mounting block (20) is rotatably installed with a lifting rod (21), the lower end of the lifting rod (21) is provided with a lifting block (23), and the lifting block (23) is arranged in the interior of the mixing tank (6), the side wall of the lifting block (23) is movably connected with a L-shaped plate (8), the interior of the L-shaped plate (8) is rotatably installed with a rotating rod (9), the circumferential surface of the left and right sides of the rotating rod (9) is provided with a hollow sleeve rod (10), the lower surface of the two groups of hollow sleeve rods (10) is provided with a vertical plate (11), and the lower end of the vertical plate (11) is provided with a scraper (12), the rear side of the two groups of hollow sleeve rods (10) is provided with a horizontal plate (13), and the rear side of the horizontal plate (13) is provided with a brush (14), the end away from the lifting block (23) of the two groups of vertical plates (11) is provided with a connecting block (15), the lower end of the two groups of connecting blocks (15) is provided with a scraper (16), the side away from the vertical plate (11) of the connecting block (15) is provided with a brush (17), the rear side of the connecting block (15) is provided with a brush (18), the circumferential surface of the middle of the rotating rod (9) is provided with a driven gear (26), the front end of the driven gear (26) is rotatably connected with a connecting plate (24), and the upper end of the connecting plate (24) is connected with the lifting block (23), and the lower end of the connecting plate (24) is provided with a brush (25).

2. The device for preparing polyaluminum chloride using coal gangue according to claim 1, characterized in that, The lower end of the two groups of scrapers (12), the two groups of scrapers (16) and the brush (25) abuts against the inner bottom wall of the mixing tank (6), and the two groups of brushes (17) abut against the side wall of the bottom of the mixing tank (6). 3.The device for preparing polyaluminum chloride from coal gangue according to claim 2, characterized in that, The interior of the mixing tank (6) is provided with a stirring mechanism (7), the stirring mechanism (7) comprises a rotating motor (701), and the rotating motor (701) is arranged on the left side of the upper surface of the mixing tank (6) through a support column, the circumferential surface of the motor shaft of the rotating motor (701) is provided with a rotating gear (702), the right side of the rotating gear (702) is rotatably connected with a driven gear (703), the middle of the driven gear (703) is provided with a rotating shaft (704), and the rotating shaft (704) is rotatably installed in the interior of the mixing tank (6), the upper surface of the L-shaped plate (8) is fixedly connected with the lower end of the rotating shaft (704), and the circumferential surface of the rotating shaft (704) is provided with a stirring rod (705).

4. The device for preparing polyaluminum chloride using coal gangue according to claim 1, characterized in that, The upper part of the lifting rod (21) is slidably installed in the interior of the rotating shaft (704) through a cross limiting block (22), the lower end of the rotating shaft (704) is internally provided with a lifting groove (33), and the upper part of the lifting block (23) is arranged in the interior of the lifting groove (33).

5. The device for preparing polyaluminum chloride using coal gangue according to claim 1, characterized in that, The upper end of the roasting box (1) is internally provided with a crushing mechanism (2), the crushing mechanism (2) comprises a servo motor (201), and the servo motor (201) is arranged on the rear side outer wall of the roasting box (1) through a motor base, a power output end of the servo motor (201) is transmissionally connected with a rotating shaft one (202), a circumferential surface of the front end of the rotating shaft one (202) is provided with a rotating gear one (203), a right side of the rotating gear one (203) is meshingly connected with a driven gear one (204), a rear side of the driven gear one (204) is provided with a rotating shaft two (205), and circumferential surfaces of the middle portions of the rotating shaft one (202) and the rotating shaft two (205) are all provided with a crushing roller (206). 6.The device for preparing polyaluminum chloride from coal gangue according to claim 5, characterized in that, The inside of the roasting box (1) is provided with a partition plate (3), and the partition plate (3) is located below the crushing roller (206), and the partition plate (3) is located on the left side of the feeding port (4).

7. The device for preparing polyaluminum chloride using coal gangue according to claim 6, characterized in that, A left side of the partition plate (3) is provided with an opening and closing mechanism (5), the opening and closing mechanism (5) comprises a lifting cylinder (501), and the lifting cylinder (501) is arranged below the roasting box (1), an upper end of the lifting cylinder (501) is provided with a sealing plate one (502), an upper end of the sealing plate one (502) is provided with a connecting plate one (503), an upper surface of the connecting plate one (503) is provided with a sealing plate two (504), an upper end of the sealing plate two (504) is tightly attached to the upper portion of the feeding port (4), a left side of the sealing plate two (504) is provided with an abutting plate (505), and an upper surface of the abutting plate (505) is abutted with a lower surface of the right end of the partition plate (3). 8.The device for preparing polyaluminum chloride from coal gangue according to claim 7, characterized in that, A right side wall of the roasting box (1) is provided with a movable groove one (28) and a movable groove two (29), and the movable groove one (28) and the movable groove two (29) are communicated, the movable groove one (28) and the movable groove two (29) are both arranged below the feeding port (4), a lower end of the sealing plate one (502) is arranged in the inside of the movable groove one (28), an upper end of the sealing plate one (502) is arranged in the inside of the movable groove two (29), and a lower end of the sealing plate two (504) is arranged in the inside of the movable groove two (29). 9.The device for preparing polyaluminum chloride from coal gangue according to claim 1, characterized in that, An upper end of the roasting box (1) is provided with a feeding port (27), an upper surface of the mixing tank (6) is provided with a liquid injection port (30) at the right end, a lower end of the right side of the mixing tank (6) is provided with a liquid outlet (31), a left end inside of the liquid outlet (31) is provided with a filter screen, a lower end of the right side of the mixing tank (6) is provided with a solid material outlet (32), and the inside of the liquid outlet (31) and the solid material outlet (32) are both provided with a valve.

10. A method for preparing polyaluminum chloride using coal gangue, characterized in that, The device is applied to the preparation of polyaluminum chloride from coal gangue according to any one of claims 1-9, and specifically comprises the following steps: Step one, first high-quality coal gangue through the feed inlet (27) into the roasting box (1) inside, start servo motor (201), servo motor (201) work driven shaft one (202) and rotating gear one (203) rotation, so that rotating gear one (203) driven gear one (204) and rotating shaft two (205) rotation, in turn, so that the shaft one (202) and shaft two (205) on the roll (206) rotation, crushing coal gangue, the coal gangue broken more small state, facilitate subsequent roasting work, broken coal gangue falls on the baffle (3), then the heating equipment in the roasting box (1) work, so that the coal gangue on the baffle (3) under high temperature roasting one hour; Step two, the hydrochloric acid solution is injected into the inside of the mixing tank (6) through the liquid injection port (30), and then after the coal gangue is roasted, the lifting cylinder (501) is started, the lifting cylinder (501) drives the sealing plate one (502), the connecting plate one (503), the sealing plate two (504) and the abutment plate (505) to move downward, so that the sealing plate two (504) opens the left side of the inlet (4), and then the coal gangue roasted on the baffle (3) falls into the inside of the mixing tank (6) through the inlet (4); Step three, start the rotating motor (701), the rotating motor (701) drives the rotating gear two (702) to rotate, so that the rotating gear two (702) drives the driven gear two (703) and the rotating shaft three (704) to rotate, so that the rotating shaft three (704) drives the stirring rod (705) and the shaped plate (8) to rotate, the stirring rod (705) rotates can stir the solution in the mixing tank (6), so that the coal gangue and hydrochloric acid react quickly, and the shaped plate (8) rotates can drive the scraper one (12) and the scraper two (16) in the shaped plate (8) to rotate, so that the scraper one (12) and the scraper two (16) stir the coal gangue deposited at the bottom of the mixing tank (6), to avoid the influence of coal gangue deposition on reaction time and reaction quality; Step four, after the coal gangue and hydrochloric acid react for a period of time, the larger coal gangue becomes small, the electric telescopic rod (19) is started, the electric telescopic rod (19) drives the mounting block (20) and the lifting rod (21) to move upward, the lifting rod (21) drives the lifting block (23) and the connecting plate two (24) to move upward for a distance, so that the connecting plate two (24) drives the driven gear three (26) to rotate ninety degrees, and then the driven gear three (26) drives the rotating rod (9) to rotate ninety degrees, so that the vertical plate (11) and the scraper one (12) rotate to the horizontal state, the horizontal plate (13) and the brush one (14) rotate to the vertical state, the brush one (14) contacts the bottom of the mixing tank (6), at this time, when the rotating shaft three (704) rotates, the brush one (14) stirs the bottom of the mixing tank (6), which can stir the small coal gangue deposited at the bottom, avoiding the large wear of the scraper during continuous scraping work, and improving the service life of the scraper. Step five, after the coal gangue and hydrochloric acid solution completely react to form aluminum chloride solution, the mixed tank (6) is heated at high temperature to evaporate and concentrate the aluminum chloride solution, so that it crystallizes, then the valve inside the liquid outlet (31) is opened first, the mixed tank (6) may have a small amount of residual moisture or incomplete evaporation of the solution is discharged from the liquid outlet (31), then the valve inside the solid material outlet (32) is opened, so that the crystallization is discharged from the solid material outlet (32) and collected, then the crystallized aluminum chloride is heated in the boiling bed reactor to partially decompose into granular, with a certain degree of alkalization, polymeric monomer, and the treated solution is added with an appropriate amount of water for treatment, at this time, the resin-like solid polymeric aluminum chloride can be generated.

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