Device and method for preparing polyaluminum chloride from coal gangue

Abstract

The invention provides a device and method for preparing polyaluminum chloride from coal gangue, and belongs to the technical field of polyaluminum chloride preparation, the device comprises a roasting box and a mixing tank, the roasting box and the mixing tank are connected through a feeding port, an electric telescopic rod is arranged on the right side of the upper surface of the mixing tank, and a mounting block is arranged at the upper end of the electric telescopic rod; through the arrangement of the n-shaped plate, the rotating rod, the vertical plate, the first scraping plate, the transverse plate and the first brush, when large coal gangue reacts with a hydrochloric acid solution, the bottom of the mixing tank can be stirred through the first scraping plate, the large coal gangue can be stirred up, the reaction effect is improved, and when the large coal gangue becomes small due to the reaction process, the large coal gangue can be stirred up through the first scraping plate. The first scraper blade and the first brush are switched, the first brush stirs the bottom of the mixing tank, fine coal gangue can be stirred, the reaction effect is improved, meanwhile, the situation that the scraper blade makes contact with the bottom of the mixing tank all the time, and consequently the scraper blade and the mixing tank are seriously abraded is avoided, and the service life of the scraper blade and the service life of the mixing tank are prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of polyaluminium chloride preparation, and specifically relates to a device and a method for preparing polyaluminium chloride by using coal gangue. Background Art

[0002] The main mineral component in coal gangue is kaolinite (Al2O3·2SiO2·2H2O), which is a 1:1 clay mineral composed of silicon-oxygen tetrahedron and aluminum-oxygen octahedron. The layers are connected by common oxygen atoms to form unit cells. Kaolinite clay particles are formed by unit cells overlapping one layer at a time in the axial direction and extending in the axial and axial directions. The unit cells are formed by hydrogen-oxygen layers facing oxygen layers, forming strong hydrogen bonds, so the unit cells are tightly connected and not easy to disperse.

[0003] Studies have shown that the gelling effect of freshly ground gangue is very weak, and the calcined gangue can show volcanic ash activity. We used scanning electron microscopy, infrared and other testing methods to track and measure the activation process of gangue. The results show that the structure of the calcined gangue is basically loose. The gangue is accompanied by structural expansion and component volatilization during high-temperature calcination. Its structure corresponds to an amorphous structure with multiple micropores, multiple broken bonds, multiple soluble substances (such as SiO2, Al2O3), and higher internal energy (containing crystals), thus showing good volcanic ash activity. At the same time, during the calcination of gangue, the crystalline kaolinite is converted into amorphous metakaolinite (Al2O3·2SiO2) due to the removal of light groups. Metakaolinite has a large specific surface area and high chemical reaction activity. The chemical equation for the acid leaching reaction is:

[0004] Al2O3·2SiO2·2H2O Al2O3·2SiO2+2H2O

[0005] Al2O3·2SiO2+HCl SiO2+AlCl3

[0006] That is, kaolinite can generate highly active metakaolinite at 600-800℃, and when the temperature continues to rise, new mullite and cristobalite crystals are formed, and the activity decreases.

[0007] However, when preparing polyaluminium chloride from coal gangue, the acid leaching reaction requires the coal gangue to react with an acidic solution such as hydrochloric acid. However, the existing mixing equipment is not easy to stir the coal gangue during the stirring process of the coal gangue and the hydrochloric acid solution, so that the coal gangue is easily precipitated at the bottom of the mixing tank, affecting the reaction rate and reaction quality.

[0008] Therefore, we propose a device and method for preparing polyaluminium chloride using coal gangue to solve the above problems. Summary of the invention

[0009] The object of the present invention is to solve the problem that in the process of preparing polyaluminum chloride from existing coal gangue, one step is an acid dissolution reaction, in which coal gangue needs to react with hydrochloric acid solution. However, in the process of stirring coal gangue and hydrochloric acid solution by existing mixing equipment, it is not easy to stir up the coal gangue, resulting in the coal gangue being prone to precipitate at the bottom of the mixing tank, affecting the reaction rate and reaction quality. Therefore, a device and method for preparing polyaluminum chloride from coal gangue are proposed.

[0010] The object of the present invention can be achieved by the following technical solutions: It includes a roasting box and a mixing tank. The roasting box and the mixing tank are connected through a feeding port. On the right side of the upper surface of the mixing tank, there is an electric telescopic rod. At the upper end of the electric telescopic rod, there is an installation block. At the lower left side of the installation block, a lifting rod is rotatably installed. At the lower end of the lifting rod, there is a lifting block, and the lifting block is arranged inside the mixing tank. The side wall of the lifting block is movably connected with a U-shaped plate. Inside the U-shaped plate, a rotating rod is rotatably installed. On the circumferential surfaces of the left and right sides of the rotating rod, there are hollow sleeve rods. On the lower surfaces of the two hollow sleeve rods, there are vertical plates, and at the lower ends of the vertical plates, there is a first scraper. At the rear sides of the two hollow sleeve rods, there are horizontal plates, and at the rear sides of the horizontal plates, there is a first brush. At the ends of the two vertical plates away from the lifting block, there are connecting blocks. At the lower ends of the two connecting blocks, there is a second scraper. On the side of the connecting block away from the vertical plate, there is a second brush. At the rear side of the connecting block, there is a third brush. On the circumferential surface in the middle of the rotating rod, there is a third driven gear. In front of the third driven gear, there is a connecting plate two engaged with it, and the upper end of the connecting plate two is connected with the lifting block. At the lower end of the connecting plate two, there is a fourth brush.

[0011] As a preferred embodiment of the present invention, the lower ends of the two first scrapers, the two second scrapers and the fourth brush are all in contact with the inner bottom wall of the mixing tank, and the two second brushes are all in contact with the side wall at the bottom of the mixing tank.

[0012] As a preferred embodiment of the present invention, a stirring mechanism is arranged inside the mixing tank. The stirring mechanism includes a rotating motor, and the rotating motor is arranged on the left side of the upper surface of the mixing tank through a support column. On the circumferential surface of the motor shaft of the rotating motor, there is a second rotating gear. On the right side of the second rotating gear, there is a second driven gear engaged with it. In the middle of the second driven gear, there is a third rotating shaft, and the third rotating shaft is rotatably installed inside the mixing tank. The lower end of the third rotating shaft is fixedly connected with the upper surface of the U-shaped plate. On the circumferential surface of the third rotating shaft, there are stirring rods.

[0013] As a preferred embodiment of the present invention, the upper part of the lifting rod is slidably installed inside the third rotating shaft through a cross-shaped limiting block. Inside the lower end of the third rotating shaft, there is a lifting groove, and the upper part of the lifting block is arranged inside the lifting groove.

[0014] As a preferred embodiment of the present invention, a crushing mechanism is arranged inside the upper end of the roasting box, and the crushing mechanism includes a servo motor, and the servo motor is arranged on the rear outer wall of the roasting box through a motor seat, and the power output end of the servo motor is transmission-connected with a rotating shaft 1, and a rotating gear 1 is arranged on the circumferential surface of the front end of the rotating shaft 1, and a driven gear 1 is meshingly connected to the right side of the rotating gear 1, and a rotating shaft 2 is arranged on the rear side of the driven gear 1, and the circumferential surfaces of the middle parts of the rotating shaft 1 and the rotating shaft 2 are both provided with crushing rollers.

[0015] As a preferred embodiment of the present invention, a partition is provided inside the roasting box, and the partition is located below the crushing roller, and the partition is located on the left side of the feed inlet.

[0016] As a preferred embodiment of the present invention, an opening and closing mechanism is arranged on the right side of the partition, and the opening and closing mechanism includes a lifting cylinder, and the lifting cylinder is arranged below the roasting box, and a sealing plate 1 is arranged on the upper end of the lifting cylinder, and a connecting plate 1 is arranged on the upper end of the sealing plate 1, and a sealing plate 2 is arranged on the upper surface of the connecting plate 1, and the upper end of the sealing plate 2 is tightly fitted with the upper part of the feed port, and an abutting plate is arranged on the left side of the sealing plate 2, and the upper surface of the abutting plate abuts against the lower surface of the right end of the partition.

[0017] As a preferred embodiment of the present invention, the right side wall of the roasting box is provided with movable groove one and movable groove two, and the movable groove one and movable groove two are connected, the movable groove one and movable groove two are both arranged below the feed port, the lower end of the sealing plate one is arranged inside the movable groove one, the upper end of the sealing plate one is arranged inside the movable groove two, and the lower end of the sealing plate two is arranged inside the movable groove two.

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

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

[0020] Step 1: First, feed high-quality coal gangue into the roasting box through the feed port, start the servo motor, and the servo motor drives the rotating shaft 1 and the rotating gear 1 to rotate, so that the rotating gear 1 drives the driven gear 1 and the rotating shaft 2 to rotate, and then the crushing rollers on the rotating shaft 1 and the rotating shaft 2 rotate to crush the coal gangue. The coal gangue is crushed into a smaller state to facilitate the subsequent roasting work. The crushed coal gangue falls on the partition, and then the heating equipment inside the roasting box works to roast the coal gangue on the partition at high temperature for one hour;

[0021] Step 2: inject the hydrochloric acid solution into the mixing tank through the injection port, and then start the lifting cylinder after the gangue is roasted. The lifting cylinder drives the sealing plate 1, the connecting plate 1, the sealing plate 2 and the abutting plate to move downward, so that the sealing plate 2 opens the left side of the feed inlet, and then the roasted gangue on the partition falls into the mixing tank through the feed inlet;

[0022] Step 3, start the rotating motor, the rotating motor drives the rotating gear 2 to rotate, so that the rotating gear 2 drives the driven gear 2 and the rotating shaft 3 to rotate, so that the rotating shaft 3 drives the stirring rod and the shaped plate to rotate, the stirring rod rotation can stir the solution inside the mixing tank, so that the gangue and hydrochloric acid react quickly, and the shaped plate rotation can drive the scraper 1 and scraper 2 inside it to rotate, so that the scraper 1 and scraper 2 stir the gangue deposited at the bottom of the mixing tank, so as to prevent the gangue precipitation from affecting the reaction time and reaction quality;

[0023] Step 4: After the gangue reacts with hydrochloric acid for a period of time and the larger gangue becomes smaller, the electric telescopic rod is started, and the electric telescopic rod drives the mounting block and the lifting rod to move upward, and the lifting rod drives the lifting block and the connecting plate 2 to move upward for a distance, so that the connecting plate 2 drives the driven gear 3 to rotate 90 degrees, and then the driven gear 3 drives the rotating rod to rotate 90 degrees, so that the vertical plate and the scraper 1 rotate to a horizontal state, the horizontal plate and the brush 1 rotate to a vertical state, and the brush 1 contacts the bottom of the mixing tank. At this time, when the rotating shaft 3 rotates, the brush 1 stirs the bottom of the mixing tank, which can stir up the fine gangue precipitated at the bottom, avoiding large wear of the scraper when it continues to scrape, and improving the service life of the scraper;

[0024] Step 5. After the gangue and the hydrochloric acid solution are completely reacted to generate an aluminum chloride solution, the mixing tank is heated at a high temperature to evaporate and concentrate the aluminum chloride solution to make it crystallize. Then, the valve inside the liquid outlet is opened to discharge a very small amount of water or incompletely evaporated solution that may remain inside the mixing tank from the liquid outlet. Then, the valve inside the solid material outlet is opened to discharge the crystals from the solid material outlet for collection. Then, in a fluidized bed reactor, the crystallized aluminum chloride is heated to partially decompose it into granular polymer monomers with a certain alkalinity. An appropriate amount of water is added to the treated solution for treatment. At this time, a resinous solid polyaluminum chloride can be generated.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] (1) By setting the shaped plate, rotating rod, vertical plate, scraper one, horizontal plate and brush one, when the larger coal gangue reacts with the hydrochloric acid solution, the scraper one can stir the bottom of the mixing tank to stir 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 the brush one are switched. At this time, the brush one stirs the bottom of the mixing tank to stir the fine coal gangue and improve the reaction effect. At the same time, it avoids the scraper from always contacting the bottom of the mixing tank, which causes serious wear of the scraper and the mixing tank, thereby increasing the service life of the scraper and the mixing tank;

[0027] (2) By setting up scraper 2, brush 2 and brush 3, the bottom edge of the mixing tank can be stirred, avoiding the difficulty of existing stirring equipment in stirring the edge of the tank body, so that the materials settled on the edge of the tank body can also be stirred smoothly, thereby improving the reaction quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0029] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0030] Figure 2 It is a front cutaway perspective view of the present invention;

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

[0032] Figure 4 It is a left-side cutaway perspective view of the molded plate of the present invention;

[0033] Figure 5 It is a first partial stereoscopic view of the hollow sleeve rod of the present invention;

[0034] Figure 6 It is a second partial stereoscopic view of the hollow sleeve rod of the present invention;

[0035] Figure 7 It is a front cutaway perspective view of a roasting box of the present invention;

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

[0037] Fig. 9 It is a three-dimensional structural schematic diagram of the opening and closing mechanism of the present invention;

[0038] Fig.10 The present invention is a process flow chart for preparing polyaluminium chloride.

[0039] In the figure: 1. roasting box; 2. crushing mechanism; 201. servo motor; 202. rotating shaft 1; 203. rotating gear 1; 204. driven gear 1; 205. rotating shaft 2; 206. crushing roller; 3. partition; 4. feeding port; 5. opening and closing mechanism; 501. lifting cylinder; 502. sealing plate 1; 503. connecting plate 1; 504. sealing plate 2; 505. abutting plate; 6. mixing tank; 7. stirring mechanism; 701. rotating motor; 702. rotating gear 2; 703. driven gear 2; 704. rotating shaft 3; 705. stirring rod; 8. 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 DESCRIPTION

[0040] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] Process flow chart for preparing polyaluminium chloride

[0042] Coal gangue from coal preparation plants is used as raw material. After high temperature calcination, it is dissolved in hydrochloric acid, and then an alkalizer and a small amount of catalyst are added to hydrolyze and polymerize to obtain solid polyaluminium chloride. The reaction process is as follows: Fig.10 .

[0043] in Fig.10 Medium: ① high temperature calcination ② acid dissolution reaction ③ hydrolysis polymerization reaction

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

[0045] Acid dissolution reaction:

[0046] Al2O3+3HCl=AlCl3+3H2O

[0047] Hydrolysis reaction:

[0048] AlCl3+nH2O=Al2(OH)nCl3-n / 2+nHCl

[0049] Polymerization reaction:

[0050] m[Al2(OH)nCl3-n / 2]=[Al2(OH)nCl3-n / 2]m

[0051] Embodiment 1:

[0052] See also Figure 1 - Fig. 9As shown in the figure, a device for preparing polyaluminum chloride using coal gangue includes a roasting box 1 and a mixing tank 6. An inlet 27 is provided at the upper end of the roasting box 1. The setting of the inlet 27 facilitates feeding coal gangue into the interior of the roasting box 1 through the inlet 27. A liquid injection port 30 is provided at the right end of the upper surface of the mixing tank 6. The setting of the liquid injection port 30 facilitates injecting hydrochloric acid solution into the interior of the mixing tank 6 through the liquid injection port 30. The roasting box 1 and the mixing tank 6 are connected through a feeding port 4, enabling the roasted coal gangue to flow into the interior of the mixing tank 6 through the feeding port 4. An electric telescopic rod 19 is provided on the right side of the upper surface of the mixing tank 6. An installation block 20 is provided at the upper end of the electric telescopic rod 19. A lifting rod 21 is rotatably installed at the lower end of the left side of the installation block 20. A lifting block 23 is provided at the lower end of the lifting rod 21, and the lifting block 23 is arranged inside the mixing tank 6. The side wall of the lifting block 23 is movably connected to a U-shaped plate 8. A rotating rod 9 is rotatably installed inside the U-shaped plate 8. Hollow sleeve rods 10 are provided on the circumferential surfaces on the left and right sides of the rotating rod 9. Vertical plates 11 are provided on the lower surfaces of the two groups of hollow sleeve rods 10, and a first scraper 12 is provided at the lower end of the vertical plate 11. Horizontal plates 13 are provided at the rear sides of the two groups of hollow sleeve rods 10, and a first brush 14 is provided at the rear side of the horizontal plate 13. Connecting blocks 15 are provided at the ends of the two groups of vertical plates 11 away from the lifting block 23. Second scrapers 16 are provided at the lower ends of the two groups of connecting blocks 15. A second brush 17 is provided on the side of the connecting block 15 away from the vertical plate 11. A third brush 18 is provided at the rear side of the connecting block 15. A third driven gear 26 is provided on the circumferential surface in the middle of the rotating rod 9. The front end of the third driven gear 26 is meshed with a second connecting plate 24, and the upper end of the second connecting plate 24 is connected to the lifting block 23. A fourth brush 25 is provided at the lower end of the second connecting plate 24. The lower ends of the two groups of first scrapers 12, the two groups of second scrapers 16, and the fourth brush 25 are all in contact with the inner bottom wall of the mixing tank 6. When the rotating shaft three 704 drives the U-shaped plate 8 and the scraper to rotate, the first scraper 12 and the second scraper 16 can stir up the coal gangue deposited at the bottom of the mixing tank 6, enabling the coal gangue to react quickly with the hydrochloric acid solution. The two groups of second brushes 17 are both in contact with the side wall of the bottom of the mixing tank 6. The upper part of the lifting rod 21 is slidably installed inside the rotating shaft three 704 through a cross-shaped limiting block 22. The setting of the cross-shaped limiting block 22 enables the rotating shaft three 704 to drive the lifting rod 21 to rotate synchronously when rotating, and then enables the lifting rod 21 to rotate synchronously with the U-shaped plate 8. A lifting groove 33 is opened inside the lower end of the rotating shaft three 704. The upper part of the lifting block 23 is arranged inside the lifting groove 33. The setting of the lifting groove 33 provides a moving space for the lifting block 23, enabling the lifting block 23 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 slot 33, the lifting block 23 drives the connecting plate 24 to move upward a distance, so that the connecting plate 24 can drive the driven gear 3 26 to rotate ninety degrees, so that the driven gear 3 26 drives the rotating rod 9 and the hollow sleeve rod 10 to rotate ninety degrees, and then the vertical plate 11 can be rotated to the front of the hollow sleeve rod 10 and be in a horizontal state, and at the same time the horizontal plate 13 rotates to the bottom of the hollow sleeve rod 10 and is in a vertical state, and 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] A crushing mechanism 2 is arranged inside the upper end of the roasting box 1, and the crushing mechanism 2 includes a servo motor 201, and the servo motor 201 is arranged on the rear outer wall of the roasting box 1 through a motor seat, and the power output end of the servo motor 201 is connected to a rotating shaft 202 through a coupling transmission, and a rotating gear 203 is arranged on the circumferential surface of the front end of the rotating shaft 202, and a driven gear 204 is meshed and connected to the right side of the rotating gear 203, wherein the rotating gear 203 and the driven gear 204 are both arranged outside the roasting box 1 and located in front of the roasting box 1, and a rotating shaft 205 is arranged on the rear side of the driven gear 204, and a crushing roller 206 is arranged on the circumferential surface of the middle parts of the rotating shaft 202 and the rotating shaft 205, and a partition 3 is arranged inside the roasting box 1, and the partition 3 is located below the crushing roller 206, and the partition 3 is located on the left side of the feeding port 4;

[0055] It should be noted that the feed port 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 port 27, it can fall at the junction of the two sets of crushing rollers 206, so that when the two sets of crushing rollers 206 rotate, the coal gangue can be smoothly crushed.

[0056] A closing and opening mechanism 5 is arranged on the right side of the partition plate 3. The closing and opening mechanism 5 includes a lifting cylinder 501, and the lifting cylinder 501 is arranged below the roasting box 1. The upper end of the lifting cylinder 501 is provided with a first sealing plate 502. The upper end of the first sealing plate 502 is provided with a first connecting plate 503. The upper surface of the first connecting plate 503 is provided with a second sealing plate 504. The upper end of the second sealing plate 504 is closely attached to the upper part of the feeding port 4. A butting plate 505 is arranged on the left side of the second sealing plate 504. The upper surface of the butting plate 505 abuts against the lower surface of the right end of the partition plate 3. A first movable groove 28 and a second movable groove 29 are formed in the right side wall of the roasting box 1, and the first movable groove 28 and the second movable groove 29 are communicated with each other. The first movable groove 28 and the second movable groove 29 are both arranged below the feeding port 4. The lower end of the first sealing plate 502 is arranged inside the first movable groove 28, and the upper end of the first sealing plate 502 is arranged inside the second movable groove 29. The lower end of the second sealing plate 504 is arranged inside the second movable groove 29. The arrangements of the first movable groove 28 and the second movable groove 29 respectively provide a movable space for the first sealing plate 502 and the second sealing plate 504, so that the first sealing plate 502 and the second sealing plate 504 can move smoothly in the vertical direction;

[0057] It should be noted that the arrangement of the butting plate 505 can abut against the bottom of the partition plate 3 when the second sealing plate 504 closes the feeding port 4, so that the staff can know that the second sealing plate 504 has moved upward to the limit and the closing work of the feeding port 4 is completed. When the second sealing plate 504 moves downward to open the feeding port 4, the arrangement of the butting plate 505 can limit the downward movement distance of the second sealing plate 504, avoiding excessive movement of the second sealing plate 504 and causing a gap between the second sealing plate 504 and the partition plate 3. When the gangue falls into the mixing tank 6 through the feeding port 4, part of the gangue flows into the inner bottom of the roasting box 1 through the gap.

[0058] A stirring mechanism 7 is arranged inside the mixing tank 6. The stirring mechanism 7 includes 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. A second rotating gear 702 is arranged on the circumferential surface of the motor shaft of the rotating motor 701. A second driven gear 703 is meshed and connected to the right side of the second rotating gear 702. A third rotating shaft 704 is arranged in the middle of the second driven gear 703, and the third rotating shaft 704 is rotatably installed inside the mixing tank 6. The lower end of the third rotating shaft 704 is fixedly connected to the upper surface of the U-shaped plate 8, and the U-shaped plate 8 can be smoothly driven to rotate when the third rotating shaft 704 rotates. Stirring rods 705 are arranged on the circumferential surface of the third rotating shaft 704;

[0059] A liquid outlet 31 is provided at the lower end of the right side of the mixing tank 6, and a filter screen is provided inside the left end of the liquid outlet 31. The setting of the filter screen can block the crystals when discharging the liquid to prevent the crystals from being discharged along with the liquid. A solid material outlet 32 ​​is provided on the right side of the lower end of the mixing tank 6, and the crystals can be discharged and collected through the solid material outlet 32 ​​to facilitate subsequent work. Valves are provided inside the liquid outlet 31 and the solid material outlet 32.

[0060] Embodiment 2:

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

[0062] Step 1: First, high-quality coal gangue is fed into the roasting box 1 through the feed port 27, and the servo motor 201 is started. The servo motor 201 drives the rotating shaft 1 202 and the rotating gear 1 203 to rotate, so that the rotating gear 1 203 drives the driven gear 1 204 and the rotating shaft 205 to rotate, and then the crushing roller 206 on the rotating shaft 1 202 and the rotating shaft 205 rotates to crush the coal gangue. The coal gangue is crushed into a smaller state to facilitate the subsequent roasting work. The crushed coal gangue falls on the partition 3, and then the heating equipment inside the roasting box 1 works, so that the coal gangue on the partition 3 is roasted at a high temperature (such as 700° C.) for one hour;

[0063] Step 2: inject the hydrochloric acid solution into the mixing tank 6 through the injection port 30, and then start the lifting cylinder 501 after the gangue is roasted. The lifting cylinder 501 drives the sealing plate 1 502, the connecting plate 1 503, the sealing plate 2 504 and the abutting plate 505 to move downward, so that the sealing plate 2 504 opens the left side of the feed port 4, and then the roasted gangue on the partition plate 3 falls into the mixing tank 6 through the feed port 4;

[0064] Step 3, start the rotating motor 701, the rotating motor 701 drives the rotating gear 2 702 to rotate, so that the rotating gear 2 702 drives the driven gear 2 703 and the rotating shaft 3 704 to rotate, so that the rotating shaft 3 704 drives the stirring rod 705 and the molded plate 8 to rotate, the stirring rod 705 rotates to stir the solution inside the mixing tank 6, so that the gangue and hydrochloric acid react quickly, and the molded plate 8 rotates to drive the scraper 1 12 and the scraper 2 16 inside it to rotate, so that the scraper 1 12 and the scraper 2 16 stir the gangue deposited at the bottom of the mixing tank 6, so as to prevent the gangue precipitation from affecting the reaction time and reaction quality;

[0065] Step 4: After the gangue reacts with hydrochloric acid for a period of time and the larger gangue becomes smaller, the electric telescopic rod 19 is started, and the electric telescopic rod 19 drives the mounting block 20 and the lifting rod 21 to move upward, and the lifting rod 21 drives the lifting block 23 and the connecting plate 24 to move upward for a distance, so that the connecting plate 24 drives the driven gear 3 26 to rotate 90 degrees, and then the driven gear 3 26 drives the rotating rod 9 to rotate 90 degrees, so that the vertical plate 11 and the scraper 1 12 rotate to a horizontal state, the horizontal plate 13 and the brush 1 14 rotate to a vertical state, and the brush 1 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 fine gangue precipitated at the bottom, avoiding the large wear of the scraper when it continues to scrape, and improving the service life of the scraper;

[0066] Step 5. After the gangue and the hydrochloric acid solution are completely reacted to generate an aluminum chloride solution, the mixing tank 6 is heated at a high temperature to evaporate and concentrate the aluminum chloride solution to crystallize it. Then, the valve inside the liquid outlet 31 is opened to discharge a very small amount of water or incompletely evaporated solution that may remain inside the mixing tank 6 from the liquid outlet 31. Then, the valve inside the solid material outlet 32 ​​is opened to discharge the crystals from the solid material outlet 32 ​​for collection. Then, in the fluidized bed reactor, the crystallized aluminum chloride is heated to partially decompose it into a granular polymer monomer with a certain alkalinity. An appropriate amount of water is added to the treated solution for treatment. At this time, a resinous solid polyaluminum chloride can be generated.

[0067] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A device for preparing polyaluminium chloride using coal gangue, comprising a roasting box (1) and a mixing tank (6), wherein the roasting box (1) and the mixing tank (6) are connected via a feed inlet (4), and characterized in that: On the right side of the upper surface of the mixing tank (6), an electric telescopic rod (19) is provided. At the upper end of the electric telescopic rod (19), a mounting block (20) is provided. At the lower end of the left side of the mounting block (20), a lifting rod (21) is rotatably installed. At the lower end of the lifting rod (21), a lifting block (23) is provided, and the lifting block (23) is arranged inside the mixing tank (6). The side wall of the lifting block (23) is movably connected to a U-shaped plate (8). Inside the U-shaped plate (8), a rotating rod (9) is rotatably installed. On the circumferential surfaces of the left and right sides of the rotating rod (9), hollow sleeve rods (10) are provided. On the lower surfaces of the two groups of hollow sleeve rods (10), vertical plates (11) are provided, and at the lower end of the vertical plate (11), a first scraper (12) is provided. At the rear sides of the two groups of hollow sleeve rods (10), cross plates (13) are provided, and at the rear side of the cross plate (13), a first brush (14) is provided. At one end of the two groups of vertical plates (11) away from the lifting block (23), connecting blocks (15) are provided. At the lower ends of the two groups of connecting blocks (15), second scrapers (16) are provided. On the side of the connecting block (15) away from the vertical plate (11), a second brush (17) is provided. At the rear side of the connecting block (15), a third brush (18) is provided. On the circumferential surface in the middle of the rotating rod (9), a third driven gear (26) is provided. The front end of the third driven gear (26) is meshed and connected with a second connecting plate (24), and the upper end of the second connecting plate (24) is connected to the lifting block (23). At the lower end of the second connecting plate (24), a fourth brush (25) is provided.

2. The device for preparing polyaluminium chloride using coal gangue according to claim 1, characterized in that: The lower ends of the two groups of first scrapers (12), the two groups of second scrapers (16) and the fourth brush (25) are all in contact with the inner bottom wall of the mixing tank (6). The two groups of second brushes (17) are both in contact with the side wall of the bottom of the mixing tank (6).

3. The device for preparing polyaluminium chloride using coal gangue according to claim 2, characterized in that: Inside the mixing tank (6), a stirring mechanism (7) is provided. The stirring mechanism (7) includes 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. On the circumferential surface of the motor shaft of the rotating motor (701), a second rotating gear (702) is provided. The right side of the second rotating gear (702) is meshed and connected with a second driven gear (703). In the middle of the second driven gear (703), a third rotating shaft (704) is provided, and the third rotating shaft (704) is rotatably installed inside the mixing tank (6). The lower end of the third rotating shaft (704) is fixedly connected to the upper surface of the U-shaped plate (8). On the circumferential surface of the third rotating shaft (704), stirring rods (705) are provided.

4. The device for preparing polyaluminium chloride using coal gangue according to claim 1, characterized in that: The upper part of the lifting rod (21) is slidably installed inside the third rotating shaft (704) through a cross-shaped limiting block (22). Inside the lower end of the third rotating shaft (704), a lifting groove (33) is opened. The upper part of the lifting block (23) is arranged inside the lifting groove (33).

5. The device for preparing polyaluminium chloride using coal gangue according to claim 1, characterized in that: A crushing mechanism (2) is arranged inside the upper end of the roasting box (1), and the crushing mechanism (2) includes a servo motor (201), and the servo motor (201) is arranged on the rear outer wall of the roasting box (1) through a motor seat, and the power output end of the servo motor (201) is drivingly connected to a rotating shaft (202), and a rotating gear (203) is arranged on the circumferential surface of the front end of the rotating shaft (202), and the right side of the rotating gear (203) is meshingly connected with a driven gear (204), and a rotating shaft (205) is arranged on the rear side of the driven gear (204), and a crushing roller (206) is arranged on the circumferential surface of the middle part of the rotating shaft (202) and the rotating shaft (205).

6. The device for preparing polyaluminium chloride using coal gangue according to claim 5, characterized in that: A partition (3) is provided inside the roasting box (1), and the partition (3) is located below the crushing roller (206), and the partition (3) is located on the left side of the feed port (4).

7. The device for preparing polyaluminium chloride using coal gangue according to claim 6, characterized in that: An opening and closing mechanism (5) is arranged on the right side of the partition (3), and the opening and closing mechanism (5) includes a lifting cylinder (501), and the lifting cylinder (501) is arranged below the roasting box (1), and a sealing plate 1 (502) is arranged on the upper end of the lifting cylinder (501), and a connecting plate 1 (503) is arranged on the upper end of the sealing plate 1 (502), and a sealing plate 2 (504) is arranged on the upper surface of the connecting plate 1 (503), and the upper end of the sealing plate 2 (504) is tightly fitted with the upper part of the feed port (4), and a contact plate (505) is arranged on the left side of the sealing plate 2 (504), and the upper surface of the contact plate (505) is in contact with the lower surface of the right end of the partition (3).

8. The device for preparing polyaluminium chloride using coal gangue according to claim 7, characterized in that: The right side wall of the roasting box (1) is provided with a movable groove 1 (28) and a movable groove 2 (29), and the movable groove 1 (28) and the movable groove 2 (29) are connected, and the movable groove 1 (28) and the movable groove 2 (29) are both arranged below the feed port (4), the lower end of the sealing plate 1 (502) is arranged inside the movable groove 1 (28), the upper end of the sealing plate 1 (502) is arranged inside the movable groove 2 (29), and the lower end of the sealing plate 2 (504) is arranged inside the movable groove 2 (29).

9. The device for preparing polyaluminium chloride using coal gangue according to claim 1, characterized in that: The upper end of the roasting box (1) is provided with a feed port (27), the right end of the upper surface of the mixing tank (6) is provided with a liquid injection port (30), the lower end of the right side of the mixing tank (6) is provided with a liquid outlet (31), and the left end of the liquid outlet (31) is provided with a filter screen, and the right side of the lower end of the mixing tank (6) is provided with a solid material outlet (32), and valves are provided inside the liquid outlet (31) and the solid material outlet (32).

10. A method for preparing polyaluminium chloride using coal gangue, characterized in that: The device for preparing polyaluminium chloride using coal gangue as claimed in any one of claims 1 to 9 specifically comprises the following steps: Step 1: First, high-quality coal gangue is fed into the interior of the roasting box (1) through the feed port (27), and the servo motor (201) is started. The servo motor (201) drives the rotating shaft (202) and the rotating gear (203) to rotate, so that the rotating gear (203) drives the driven gear (204) and the rotating shaft (205) to rotate, and then the crushing rollers (206) on the rotating shaft (202) and the rotating shaft (205) rotate to crush the coal gangue. The coal gangue is crushed into a smaller state to facilitate the subsequent roasting work. The crushed coal gangue falls on the partition (3), and then the heating equipment inside the roasting box (1) is operated to roast the coal gangue on the partition (3) at high temperature for one hour; Step 2: inject the hydrochloric acid solution into the interior of the mixing tank (6) through the injection port (30); then, after the coal gangue is roasted, start the lifting cylinder (501); the lifting cylinder (501) drives the sealing plate 1 (502), the connecting plate 1 (503), the sealing plate 2 (504) and the abutting plate (505) to move downward, so that the sealing plate 2 (504) opens the left side of the feed port (4); then, the coal gangue roasted on the partition plate (3) falls into the interior of the mixing tank (6) through the feed port (4); Step 3, start the rotating motor (701), the rotating motor (701) drives the rotating gear 2 (702) to rotate, so that the rotating gear 2 (702) drives the driven gear 2 (703) and the rotating shaft 3 (704) to rotate, so that the rotating shaft 3 (704) drives the stirring rod (705) and the shaped plate (8) to rotate, the stirring rod (705) can rotate to stir the solution inside the mixing tank (6), so that the gangue and hydrochloric acid react quickly, and the shaped plate (8) can rotate to drive the scraper 1 (12) and the scraper 2 (16) inside it to rotate, so that the scraper 1 (12) and the scraper 2 (16) stir the gangue deposited at the bottom of the mixing tank (6), so as to prevent the gangue sedimentation from affecting the reaction time and reaction quality; Step 4: After the gangue reacts with the hydrochloric acid for a period of time and the larger gangue becomes smaller, 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, and the lifting rod (21) drives the lifting block (23) and the second connecting plate (24) to move upward for a distance, so that the second connecting plate (24) drives the driven gear (26) to rotate 90 degrees, and then the driven gear (26) drives the rotating rod (9) to rotate The vertical plate (11) and the scraper plate (12) are rotated 90 degrees, so that the vertical plate (11) and the scraper plate (12) are rotated to a horizontal state, and the horizontal plate (13) and the brush plate (14) are rotated to a vertical state, and the brush plate (14) contacts the bottom of the mixing tank (6). At this time, when the rotating shaft (704) rotates, the brush plate (14) stirs the bottom of the mixing tank (6), and can stir up the fine coal gangue settled at the bottom, thereby avoiding large wear of the scraper plate when it continues to scrape, and improving the service life of the scraper plate; Step 5: After the gangue and the hydrochloric acid solution are completely reacted to generate the aluminum chloride solution, the mixing tank (6) is heated at a high temperature to evaporate and concentrate the aluminum chloride solution to crystallize it. Then, the valve inside the liquid outlet (31) is opened to discharge a very small amount of water or incompletely evaporated solution that may remain inside the mixing tank (6) from the liquid outlet (31). Then, the valve inside the solid material outlet (32) is opened to discharge the crystals from the solid material outlet (32) for collection. Then, in the fluidized bed reactor, the crystallized aluminum chloride is heated to partially decompose it into granular polymer monomers with a certain alkalinity. An appropriate amount of water is added to the treated solution for treatment. At this time, a resin-like solid polyaluminum chloride is generated.

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