Polymeric aluminum sulfate flocculant production polymeric reaction device and production method

Abstract

The application belongs to the technical field of wastewater treatment, and particularly relates to a polymerization reaction device for producing polyaluminum sulfate flocculant and a production method, which comprises a base, a reaction kettle, a mixing structure and a scraping assembly. The reaction kettle is formed by combining an upper tank body and a lower tank body. An exhaust pipe is fixed to the top of the upper tank body. A feed pipe is symmetrically fixed to the upper part of the side of the lower tank body. The mixing structure is arranged in the middle of the reaction kettle. The mixing structure is rotatably installed below the middle of the upper tank body. The mixing structure comprises a driving shaft, and the side of the driving shaft is uniformly provided with stirring rods. A motor for driving the mixing structure to rotate is fixed to the top of the upper tank body. The scraping assembly is installed on the driving shaft. The scraping assembly is driven to rotate by the driving shaft to clean the foam on the top of the mixed solution in the reaction kettle. The foam on the surface of the mixed solution is cleaned by the scraping assembly, so that the gas generated in the reaction process is smoothly discharged upwards from the inside of the solution, and the reaction is stably carried out.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of wastewater treatment, and particularly relates to a polymerization reaction device for producing polyaluminum sulfate flocculant and a production method. BACKGROUND

[0002] Polyaluminum sulfate is a commonly used inorganic flocculant, widely used in water treatment, wastewater treatment and drinking water purification fields. Through polymerization reaction, polyaluminum sulfate can effectively remove suspended solids, bacteria and other pollutants in water, and is widely used in environmental protection and industrial fields. The production of polyaluminum sulfate usually involves the reaction process of aluminum salt and sulfuric acid solution, in which bauxite and concentrated sulfuric acid are often used as main raw materials. In this process, after the mixing of bauxite slurry and sulfuric acid solution, sulfur dioxide, water vapor and other gases are generated. These gases may form bubbles during stirring and cause the formation of a foam layer on the liquid surface.

[0003] The formation of the foam layer will have an adverse effect on the reaction system. The foam layer may enclose or wrap the gas in the reaction, making it difficult to effectively escape, resulting in the accumulation of gas concentration in the reaction system, thereby affecting the reaction rate and reaction equilibrium. The accumulation of gas not only may cause instability of the reaction process, but also may cause reduction of production efficiency, and even cause safety hazards.

[0004] To solve this problem, the existing technology usually uses physical or chemical methods for foam treatment, such as adding foam inhibitors, adjusting reaction conditions, etc. Although these methods can alleviate the foam problem to some extent, due to the limited effect, and the possible introduction of additional chemicals or increase in production cost, there is still room for improvement.

[0005] Therefore, the application provides a polymerization reaction device for producing polyaluminum sulfate flocculant and a production method. SUMMARY

[0006] In order to make up for the deficiencies of the prior art and solve at least one technical problem raised in the background art.

[0007] The technical scheme adopted by the application to solve its technical problems is that the application provides a polymerization reaction device for producing polyaluminum sulfate flocculant, which comprises:

[0008] a base;

[0009] a reaction kettle, the reaction kettle is formed by combining an upper tank body and a lower tank body, an exhaust pipe is fixed at the top of the upper tank body, a feed pipe is fixed symmetrically on the upper part of the side of the lower tank body, and a discharge pipe is fixed at the bottom of the lower tank body;

[0010] A mixing structure is arranged in the middle of the reaction kettle, and is rotatably arranged below the middle of the upper tank body, and comprises a driving shaft, and the side edges of the driving shaft are uniformly provided with stirring rods, and a motor for driving the rotation of the mixing structure is fixed to the top of the upper tank body;

[0011] A scraping assembly is arranged on the driving shaft, and is driven to rotate by the driving shaft to clean the foam on the top of the mixed solution in the reaction kettle, and comprises a connecting sleeve arranged on the driving shaft, and a scraper is detachably arranged on the side edge of the connecting sleeve, and a through slot is arranged in the middle of the scraper, and a filtering assembly is arranged in the middle of the through slot, and intercepting blocks are arranged at the open ends of the through slot.

[0012] Preferably, a square rod is arranged on the driving shaft, the connecting sleeve is matched with the square rod, the connecting sleeve is slidably sleeved on the square rod, and a floating plate is arranged in the through slot of the scraper.

[0013] Preferably, a pair of filtering assemblies are arranged, and the filtering assemblies are symmetrically arranged on both sides of the middle of the through slot, the floating plate is arranged in the middle of the filtering assemblies on both sides, a sleeve is arranged on the filtering assembly, a connecting rod is slidably and sealingly arranged in the middle of the sleeve, one end of the connecting rod is fixedly connected with the floating plate, and the other end of the connecting rod is fixedly connected with a movable frame for pressing the intercepting block.

[0014] Preferably, a water outlet groove is arranged on each of the upper and lower sides of the scraper, and a filter membrane I is fixed in the water outlet groove.

[0015] Preferably, the filtering assembly comprises a mounting frame, a pair of filter membranes II are arranged in the middle of the mounting frame, the sleeve is fixedly arranged at the middle of the filter membrane II, movable plates are respectively fixed to the upper and lower ends of the filter membrane II, the movable plates are slidably arranged in slide cavities formed in the inner wall of the mounting frame, springs I are arranged between the movable plates and the inner wall of the slide cavities, movable rods are arranged in the middle of the filter membranes II on both sides, one end of each movable rod is fixedly connected with a movable plate, the other end of each movable rod is fixedly connected with a magnetic block II, the magnetic block II is adjacent to a sliding sleeve, a plurality of magnetic blocks I are uniformly arranged in the connecting rod, and the magnetic blocks I and the magnetic blocks II repel each other.

[0016] Preferably, the end of the scraper is attached to the inside of the reactor, the end of the scraper away from the square rod is provided with a movable cavity, a rotating column is rotatably installed in the movable cavity, a roller is fixedly installed in the middle of the rotating column, the roller abuts against the inner wall of the reactor, the bottom end of the rotating column is inclined, an open barrel is fixed in the through slot of the scraper, a piston plate is sealingly and slidably installed in the barrel, a slide rod is fixed to the bottom of the piston plate, the bottom end of the slide rod is slidably inserted into a square hole formed in the bottom of the scraper, an L-shaped pressing rod is fixed to the side of the slide rod, one end of the pressing rod away from the slide rod abuts against the inclined surface edge of the bottom end of the rotating column, a spring is arranged below the pressing rod to reset the pressing rod, a through hole is formed in the piston plate, a flap is rotatably installed above the through hole by means of a torsion spring, water guide pipes are symmetrically fixed to the top of the scraper, a plurality of nozzles are uniformly arranged on the side of the water guide pipes, and a three-way pipe is fixed to the top of the barrel and connected with the water guide pipes on both sides through one-way pipes.

[0017] Preferably, the bottom of the upper tank is clamped in the support ring, and the inside of the support ring is provided with a sealing ring.

[0018] Preferably, the driving assembly comprises a connecting frame fixed to the top of the upper tank, and hydraulic cylinders for driving the connecting frame to move up and down are symmetrically installed at both ends of the base.

[0019] Preferably, the mounting frame is fixedly connected with the scraper by bolts.

[0020] A production method of a polyaluminum sulfate flocculant, which adopts the polymeric reaction device for producing a polyaluminum sulfate flocculant, and comprises the following steps:

[0021] S1, using a crusher to preliminarily crush bauxite to ensure that the bauxite particles reach the required particle size, and feeding the crushed bauxite into a grinding machine to grind to a specified particle size;

[0022] S2, adding the ground bauxite and sulfuric acid into an acid treatment tank according to a set ratio to perform acidification reaction to obtain bauxite slurry;

[0023] S3, feeding the acid-treated bauxite slurry and sulfuric acid solution into a reaction kettle according to a set ratio to control the pH value, temperature and reaction time in the reaction kettle, so that the aluminum element in the bauxite reacts with sulfuric acid to form polyaluminum sulfate;

[0024] S4, starting the mixing structure to stir the mixed solution to uniformly mix the materials and improve the reaction speed;

[0025] S5, synchronously drive the scraping assembly to rotate, scrape the foam and impurities gathered on the surface of the mixed solution, so as to release the gas generated in the reaction process, and guide the gas out of the collection through the exhaust pipe;

[0026] S6, after the polymerization reaction is completed, the temperature during the reaction is maintained, the stirring is stopped, the aging is carried out, and the polyaluminum sulfate flocculant can be obtained after the aging is completed.

[0027] The beneficial effects of the present application are as follows:

[0028] 1. The polyaluminum sulfate flocculant production polymerization reaction device and production method, by setting the mixing structure and scraping assembly, the motor drives the driving shaft and the stirring rod to rotate, and the mixed solution is stirred to uniformly mix the materials; the driving shaft rotates synchronously to drive the scraper to move, the scraper scrapes the foam on the surface of the mixed solution, avoids the foam from gathering on the surface of the solution to form a foam layer, hinders the gas generated in the reaction process from being discharged upward from the inside of the solution, and avoids the gas from affecting the reaction process; during the movement of the scraper, the foam first contacts the intercepting block, and under the impact of the solution, the foam enters the gap of the intercepting block, and the water flow can pull the foam to break it, so that the gas in the bubble is released.

[0029] 2. The polyaluminum sulfate flocculant production polymerization reaction device and production method, by intermittently forward or reverse rotating the motor-driven mixing structure and scraper, the bauxite slurry and sulfuric acid solution can be fully mixed, and the mixing effect is improved; in addition, when the scraper rotates clockwise, the floating plate moves in the opposite direction of the movement direction of the scraper under the push of the water flow, and then drives the movable frame to move through the connecting rod; at this time, the intercepting block opposite to the movement direction of the floating plate contacts the foam, and the intercepting block on the other side is extruded and shrunk by the movable frame; similarly, when the scraper rotates counterclockwise, the floating plate moves in the opposite direction under the push of the water flow, and the intercepting block previously contacted with the foam is extruded by the movable frame, so that the gap of the grid structure in the intercepting block is reduced, so that the foam entering the gap in the intercepting block is crushed, and the gas in the foam is further released; at the same time, the impurities can be pressed and bound in the intercepting block, so as to avoid being washed out during reverse rotation. BRIEF DESCRIPTION OF DRAWINGS

[0030] The present application will be further described below with reference to the accompanying drawings.

[0031] Figure 1 is a perspective view of the present application;

[0032] Figure 2 is a partial sectional view of the present application;

[0033] Figure 3 is a structure diagram of the scraping assembly of the present application;

[0034] Figure 4 is a sectional view of the scraping assembly of the present application;

[0035] Figure 5 is Figure 4 is an enlarged view of A in FIG. 1;

[0036] Figure 6 is a partial sectional view of the scraping assembly of the present application;

[0037] Figure 7 is Figure 6 is an enlarged view of B in FIG. 1;

[0038] Figure 8 is a structural schematic view of the movable frame and the intercepting block of the present application;

[0039] Figure 9 is a front view of the present application;

[0040] Figure 10 is a flow chart of the method of the present application.

[0041] In the figure: 1, base; 2, upper tank body; 3, lower tank body; 4, hydraulic cylinder; 5, connecting frame; 6, exhaust pipe; 7, mixing structure; 8, square rod; 9, scraping assembly; 10, connecting sleeve; 11, scraper; 12, intercepting block; 13, mounting frame; 14, filter membrane I; 15, movable frame; 16, filter membrane II; 17, floating plate; 18, sleeve; 19, connecting rod; 20, magnetic block I; 21, movable rod; 22, magnetic block II; 23, mounting frame; 24, movable plate; 25, spring I; 26, barrel body; 27, one-way pipe; 28, water guide pipe; 29, spray head; 30, piston plate; 31, through hole; 32, flap; 33, slide rod; 34, spring II; 35, pressing rod; 36, rotating column; 37, roller; 38, support ring; 39, sealing ring. DETAILED DESCRIPTION

[0042] In order to make the technical means, creative features, purposes and effects of the present application easy to understand, the present application is further described below in combination with specific embodiments.

[0043] Embodiment one: as shown in the figure, the polymeric aluminum sulfate flocculant production polymeric reaction device described in the embodiment of the present application comprises: Figures 1 to 9

[0044] base 1;

[0045] reaction kettle, the reaction kettle is combined by an upper tank body 2 and a lower tank body 3, the upper tank body 2 is fixed with an exhaust pipe 6 at the top, the lower tank body 3 is fixed with a feed pipe on the upper part of the side edge, and the lower tank body 3 is fixed with a discharge pipe at the bottom;

[0046] ​A mixing structure 7 is arranged in the middle of the reaction kettle, the mixing structure 7 is rotatably arranged below the middle of the upper tank body 2, the mixing structure 7 comprises a driving shaft, and the side edges of the driving shaft are uniformly provided with stirring rods; and a motor for driving the rotation of the mixing structure 7 is fixed to the top of the upper tank body 2;

[0047] A scraping assembly 9 is arranged on the driving shaft and driven to rotate by the driving shaft to clean the foam on the top of the mixed solution in the reaction kettle, the scraping assembly 9 comprises a connecting sleeve 10 arranged on the driving shaft, and a scraping plate 11 is detachably arranged on the side edge of the connecting sleeve 10; a through groove is arranged in the middle of the scraping plate 11, a filtering assembly is arranged in the middle of the through groove, and intercepting blocks 12 are arranged at the two open ends of the through groove; the intercepting blocks 12 are arranged in a hollow grid shape and are formed by winding acid-resistant fine steel wires;

[0048] In operation, the bauxite is first preliminarily crushed by the crusher to ensure that the bauxite particles reach the required particle size, and then the crushed bauxite is sent to the grinding machine for grinding to a specified particle size, and the particle size of the bauxite is required to be within a certain range to ensure that it can fully react with sulfuric acid; then the finely ground bauxite and sulfuric acid are added into the acid treatment tank according to the set proportion to perform acidification reaction. This process is mainly used to dissolve the bauxite minerals in the bauxite to generate an aluminum salt solution. In the acidification process, the temperature and acid concentration in the tank are controlled to improve the dissolution efficiency of the bauxite; then the acid-treated bauxite slurry and the sulfuric acid solution are fed into the reaction kettle through the feeding pipe according to the set proportion, the pH value, temperature and reaction time in the reaction kettle are controlled (the pH value is adjusted by adding an alkaline solution, and the reaction temperature is controlled by the existing heating setting), to ensure that the aluminum element in the bauxite fully reacts with sulfuric acid to form polyaluminum sulfate, and the reaction process needs to last for a period of time to promote the polymerization reaction of the aluminum salt to generate efficient polyaluminum sulfate, and finally the produced polyaluminum sulfate is discharged from the bottom of the lower tank body 3 through the discharge pipe;

[0049] The motor is started to drive the driving shaft and the stirring rods to rotate to stir the mixed solution so that the materials are uniformly mixed; the driving shaft drives the scraping plate 11 to move during rotation, the scraping plate 11 cleans the foam on the surface of the mixed solution by rotating to avoid the foam gathering on the surface of the solution to form a foam layer that hinders the gas generated in the reaction process from being discharged upward from the inside of the solution, avoids the gas gathering to affect the reaction process, so that the reaction can be stably carried out, and then the gas is discharged and collected through the exhaust pipe 6;

[0050] By setting the hollow grid-shaped intercepting block 12 on both sides of the through slot in the middle of the scraper 11, the foam first contacts the intercepting block 12 during the movement of the scraper 11, and under the impact of the solution, the foam enters the gap of the intercepting block 12, the filter membrane two 16 arranged in the middle of the through slot allows water to pass through, and the water flow can pull the foam to break the foam and release the gas in the bubble; in addition, the grid-shaped intercepting block 12 can collect impurities on the surface of the solution and bind the impurities in the gap of the intercepting block 12, so as to avoid the impurities from settling again during the mixing and stirring process, thereby reducing the complexity of the subsequent filtering operation.

[0051] The square rod 8 is arranged on the driving shaft, the connecting sleeve 10 is matched with the square rod 8, the connecting sleeve 10 is sleeved on the square rod 8, and the floating plate 17 is arranged in the through slot of the scraper 11; during work, the floating plate 17 can effectively increase the buoyancy of the scraper 11, so that the scraper 11 can maintain a stable floating state on the surface of the mixed solution; during work, the liquid level of the mixed solution may fluctuate, and the existence of the floating plate 17 enables the scraper 11 to automatically adjust the buoyancy according to the change of the liquid level, so as to adapt to different working environments and maintain high scraping effect and working stability.

[0052] The filter assembly is provided in pairs, the filter assemblies are symmetrically arranged on both sides of the middle part of the through slot, the floating plate 17 is arranged in the middle of the two filter assemblies, the filter assembly is provided with a sleeve 18, the connecting rod 19 is sealingly and slidably arranged in the sleeve 18, one end of the connecting rod 19 is fixedly connected with the floating plate 17, and the other end of the connecting rod 19 is fixedly connected with the movable frame 15 for extruding the intercepting block 12.

[0053] During work, the motor is a forward and reverse motor, which can control the motor to drive the mixing structure 7 and the scraper 11 to intermittently rotate forward or reverse, so as to fully mix the bauxite slurry and the sulfuric acid solution and improve the mixing effect; in addition, when the scraper 11 rotates clockwise, the floating plate 17 moves in the direction opposite to the movement direction of the scraper 11 under the push of the water flow, and then drives the movable frame 15 to move through the connecting rod 19; at this time, the intercepting block 12 opposite to the movement direction of the floating plate 17 contacts the foam, and the other intercepting block 12 is extruded and shrunk by the movable frame 15; similarly, when the scraper 11 rotates counterclockwise, the floating plate 17 moves in the opposite direction under the push of the water flow, and the intercepting block 12 previously contacting the foam is extruded by the movable frame 15, so that the gap of the grid structure in the intercepting block 12 is reduced; in this way, the foam in the gap of the intercepting block 12 can be crushed, and the gas in the foam can be further released; at the same time, the impurities can be tightly bound in the intercepting block 12, so as to avoid being washed out during reverse rotation.

[0054] The water outlet grooves are respectively arranged on the upper side and the lower side of the scraper 11, and the filter membrane one 14 is fixed in the water outlet groove; during work, the filter membrane one 14 is arranged to discharge the solution in the middle of the scraper 11 outward.

[0055] The filter assembly comprises a mounting frame 23, a pair of filter membranes 16 is mounted in the middle of the mounting frame 23, the sleeve 18 is fixed in the middle of the filter membrane 16, the upper and lower ends of the filter membrane 16 are respectively fixed with movable plates 24, the movable plates 24 are slidingly arranged in the sliding cavities formed in the inner wall of the mounting frame 23, springs 25 are fixed between the movable plates 24 and the inner wall of the sliding cavities, movable rods 21 are arranged in the middle of the filter membranes 16 on both sides, one end of the movable rod 21 is fixedly connected with the movable plate 24, the other end of the movable rod 21 is fixed with a magnetic block 22, the magnetic block 22 is adjacent to the sliding sleeve, a plurality of magnetic blocks 20 are uniformly arranged in the connecting rod 19, the magnetic blocks 20 and the magnetic blocks 22 repel each other.

[0056] When the control scraper 11 rotates forward and reversely, the connecting rod 19 reciprocatingly slides along the sleeve 18, the connecting rod 19 synchronously drives the magnetic blocks 20 to move, when the magnetic blocks 20 move to be aligned with the magnetic blocks 22, the movable rods 21 are pushed to move away from the connecting rod 19 by repulsion, and then the movable plates 24 are driven to move, and the springs 25 are compressed, when the magnetic blocks 20 and the magnetic blocks 22 are misaligned, the springs 25 rebound, and the movable plates 24 and the movable rods 21 are synchronously driven to move reversely, through the repeated upward and downward movement of the movable plates 24, the filter membranes 16 are continuously shaken, so as to shake off the impurities adhered to the surface of the filter membranes 16, and the filter membranes 16 can keep good filter residue performance; in addition, when the forward and reverse rotation is switched, the relative movement direction of the scraper 11 and the solution is changed, so as to backwash the filter membranes 16 by the solution, and further remove the impurities adhered to the surface of the filter membranes 16.

[0057] The end of the scraper 11 is attached to the inside of the reactor, and a movable cavity is formed in the middle of the end of the scraper 11 away from the square rod 8. A rotating column 36 is rotatably installed in the middle of the movable cavity. A roller 37 is fixed to the middle of the rotating column 36. The roller 37 abuts against the inner wall of the reactor. The bottom end of the rotating column 36 is inclined. An open-bottom barrel 26 is fixed in the through slot of the scraper 11. A piston plate 30 is sealingly and slidably installed in the middle of the barrel 26. A slide rod 33 is fixed to the bottom of the piston plate 30. The bottom end of the slide rod 33 is slidably inserted into the square hole formed in the bottom of the scraper 11. An L-shaped pressing rod 35 is fixed to the side of the slide rod 33. The end of the pressing rod 35 away from the slide rod 33 abuts against the inclined edge of the bottom end of the rotating column 36. A spring 34 is arranged below the pressing rod 35 to reset the pressing rod 35. A through hole 31 is formed in the piston plate 30. A flap 32 is rotatably installed above the through hole 31 by a torsion spring. Two water guide pipes 28 are symmetrically fixed to the top of the scraper 11. A plurality of nozzles 29 are uniformly arranged on the side of each water guide pipe 28. A three-way pipe is fixed to the top of the barrel 26. The two ends of the three-way pipe are connected to the two water guide pipes 28 by one-way pipes 27. During operation, the roller 37 at the end of the scraper 11 can roll along the inner wall of the reactor, thereby driving the rotating column 36 to rotate. The inclined surface at the bottom of the rotating column 36 cooperates with the spring 34 to drive the pressing rod 35 and the slide rail to reciprocate up and down, thereby driving the piston plate 30 to move up and down. When the piston plate 30 moves downward, the solution below can push the flap 32 to rotate upward to open, so that the solution enters the inside of the barrel 26. When the piston plate 30 moves upward, the flap 32 is closed above the through hole 31 under the action of water pressure. At this time, the piston plate 30 and the flap 32 move upward to press the solution in the barrel 26 into the water guide pipe 28 through the one-way pipe 27, and the solution is sprayed on the contact position of the intercepting block 12 and the foam through the nozzles 29, thereby flushing the foam to improve the foam removal efficiency.

[0058] The top of the lower tank body 3 is fixed with a support ring 38. The bottom end of the upper tank body 2 is clamped in the support ring 38. The inside of the support ring 38 is provided with a sealing ring 39. During operation, the sealing ring 39 is arranged to increase the air tightness of the connection position of the upper tank body 2 and the lower tank body 3.

[0059] The driving assembly includes a connecting frame 5 fixed to the top of the upper tank body 2. Hydraulic cylinders 4 are symmetrically installed at the two ends of the base 1 to drive the connecting frame 5 to move up and down. During operation, the connecting frame 5 can be driven to move upward by the hydraulic cylinders 4 to open the upper tank body 2. At this time, the scraper 11 can be disassembled from the connecting sleeve 10 for cleaning and maintenance of the internal structure of the scraper 11 to facilitate repeated use.

[0060] Example two: as Figure 9As shown, the comparative example one, wherein another embodiment of the application is: the intercept block 12 is fixed with the mounting bracket 13 away from the side of the movable frame 15, the mounting bracket 13 is fixedly connected with the scraper 11 through the bolt; during operation, the intercept block 12 is installed on the scraper 11 through the bolt structure, which facilitates the disassembly and assembly of the intercept block 12.

[0061] As Figure 10 shown, a production method of polyaluminum sulfate flocculant, the method uses the above-mentioned polyaluminum sulfate flocculant production polymerization reaction device, including the following steps:

[0062] S1, using a crusher to preliminarily crush bauxite, to ensure that the bauxite particles reach the required particle size, and the crushed bauxite is sent to a grinding machine for grinding to a specified particle size;

[0063] S2, the finely ground bauxite and sulfuric acid are added to the acid treatment tank according to the set proportion, and the acidification reaction is carried out to obtain bauxite slurry;

[0064] S3, the acidified bauxite slurry and sulfuric acid solution are put into the reaction kettle according to the set proportion, the pH value, temperature and reaction time in the reaction kettle are controlled, so that the aluminum element in the bauxite reacts with sulfuric acid to form polyaluminum sulfate;

[0065] S4, start the mixing structure 7 to stir the mixed solution to make the materials uniformly mixed and improve the reaction speed;

[0066] S5, synchronously drive the scraping assembly 9 to rotate, scrape off the foam and impurities gathered on the surface of the mixed solution, so as to release the gas generated in the reaction process, and the gas is discharged through the exhaust pipe 6 for collection;

[0067] S6, after the polymerization reaction is completed, the temperature during the reaction is maintained, the stirring is stopped, and the aging is carried out, and after the aging is completed, the polyaluminum sulfate flocculant can be obtained by filtering.

[0068] The above, front, left, right, up and down are based on the drawings in the specification Figure 1 , according to the standard of human observation angle, the side of the device facing the observer is defined as front, the left side of the observer is defined as left, and so on.

[0069] In the description of the application, it is to be understood that the terms "center", "longitudinal", "transverse", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings and are used only for the purpose of facilitating the description of the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the scope of protection of the application.

[0070] The basic principles, main features and advantages of the application are shown and described above. Those skilled in the art should understand that the application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principles of the application. Without departing from the spirit and scope of the application, various changes and improvements can be made to the application, and these changes and improvements all fall within the scope of the application. The scope of protection of the application is defined by the appended claims and their equivalents.

Claims

1. A polymerization reactor for producing polyaluminum sulfate flocculant, characterized in that: include: Base (1); The reactor is formed by combining an upper tank (2) and a lower tank (3). An exhaust pipe (6) is fixed on the top of the upper tank (2), a feed pipe is symmetrically fixed on the upper side of the lower tank (3), and a discharge pipe is fixed on the bottom of the lower tank (3). The mixing structure (7) is located in the middle of the reactor. The mixing structure (7) is rotatably mounted in the lower middle of the upper tank (2). The mixing structure (7) includes a drive shaft. Stirring rods are evenly distributed on the side of the drive shaft. A motor for driving the mixing structure (7) to rotate is fixed on the top of the upper tank (2). Scraping assembly (9) is mounted on a drive shaft and driven to rotate by the drive shaft to clean the foam on top of the mixed solution inside the reactor. The scraping assembly (9) includes a connecting sleeve (10) set on the drive shaft. A scraper (11) is detachably installed on the side of the connecting sleeve (10). A through groove is provided in the middle of the scraper (11). A filter assembly is provided in the middle of the through groove. An intercepting block (12) is installed at the open ends of the through groove. The intercepting block (12) is set as a hollow mesh. A square rod (8) is provided on the drive shaft, and the connecting sleeve (10) is adapted to the square rod (8). The connecting sleeve (10) is slidably sleeved on the square rod (8), and a floating plate (17) is installed inside the through groove of the scraper (11). The filter assembly is provided in pairs and is symmetrically installed on both sides of the middle of the channel. The float plate (17) is located between the two filter assemblies. The filter assembly is provided with a sleeve (18). A connecting rod (19) is slidably installed in the middle of the sleeve (18). One end of the connecting rod (19) is fixedly connected to the float plate (17), and the other end of the connecting rod (19) is fixed with a movable frame (15) for squeezing the intercepting block (12). The scraper (11) has water outlet grooves on its upper and lower sides, and a filter membrane (14) is fixed in the water outlet grooves; the filter assembly includes a mounting frame (23), a pair of filter membranes (16) are installed in the middle of the mounting frame (23), the sleeve (18) is fixed in the middle of the filter membranes (16), and movable plates (24) are fixed at the upper and lower ends of the filter membranes (16), and the movable plates (24) are slidably arranged in the sliding cavity opened on the inner wall of the mounting frame (23). A spring (25) is fixed between the movable plate (24) and the inner wall of the sliding cavity. A movable rod (21) is provided between the filter membranes (16) on both sides. One end of the movable rod (21) is fixedly connected to the movable plate (24). A magnetic block (22) is fixed at the other end of the movable rod (21). The magnetic block (22) is adjacent to the sliding sleeve. Multiple magnetic blocks (20) are evenly distributed inside the connecting rod (19). The magnetic blocks (20) and the magnetic blocks (22) repel each other.

2. The polymerization reactor for producing polyaluminum sulfate flocculant according to claim 1, characterized in that: The scraper (11) is fitted to the inside of the reactor at its end. A movable cavity is provided in the middle of the end of the scraper (11) away from the square rod (8). A rotating column (36) is rotatably installed in the middle of the movable cavity. A roller (37) is fixed in the middle of the rotating column (36). The roller (37) abuts against the inner wall of the reactor. The bottom end of the rotating column (36) is inclined. A barrel (26) with an open bottom is fixed in the through groove of the scraper (11). A piston plate (30) is slidably installed in the middle of the barrel (26). A sliding rod (33) is fixed at the bottom of the piston plate (30). The bottom end of the sliding rod (33) is slidably inserted into the square hole at the bottom of the scraper (11). An L-shaped pressure rod (35) is fixed to the side of the slide rod (33). The end of the pressure rod (35) away from the slide rod (33) abuts against the edge of the bottom inclined surface of the rotating column (36). A spring (34) is provided below the pressure rod (35) to reset the pressure rod (35). A through hole (31) is provided on the piston plate (30). A flap (32) is rotatably installed above the through hole (31) by a torsion spring. Water guide pipes (28) are symmetrically fixed on both sides of the top of the scraper (11). Multiple nozzles (29) are evenly distributed on the side of the water guide pipes (28). A three-way pipe is fixed to the top of the barrel (26). The two ends of the three-way pipe are connected to the two side water guide pipes (28) through one-way pipes (27).

3. The polymerization reactor for producing polyaluminum sulfate flocculant according to claim 2, characterized in that: The lower tank (3) is fixed with a support ring (38) at the top, and the bottom of the upper tank (2) is engaged in the support ring (38). A sealing ring (39) is provided inside the support ring (38).

4. The polymerization reactor for producing polyaluminum sulfate flocculant according to claim 3, characterized in that: The drive assembly includes a connecting frame (5) fixed to the top of the upper tank (2), and hydraulic cylinders (4) that drive the connecting frame (5) to move up and down are symmetrically installed at both ends of the base (1).

5. The polymerization reactor for producing polyaluminum sulfate flocculant according to claim 4, characterized in that: The interceptor block (12) is fixed with a mounting bracket (13) on the side away from the movable frame (15), and the mounting bracket (13) is fixedly connected to the scraper (11) by bolts.

6. A method for producing polyaluminum sulfate flocculant, the method employing the polymerization reactor for producing polyaluminum sulfate flocculant as described in claim 5, characterized in that: Includes the following steps: S1. Use a crusher to perform preliminary crushing of bauxite to ensure that the bauxite particles reach the required particle size. Then, send the crushed bauxite into a grinding mill for grinding until it is fined to the specified particle size. S2. The finely ground bauxite and sulfuric acid are added to the acid treatment tank in a set ratio to carry out an acidification reaction and obtain bauxite slurry. S3. Add the acidified bauxite slurry and sulfuric acid solution into the reactor according to the set ratio, and control the pH value, temperature and reaction time in the reactor so that the aluminum element in the bauxite reacts with the sulfuric acid to form polyaluminum sulfate. S4. Start the mixing structure (7) to stir the mixed solution so that the materials are mixed evenly and the reaction rate is increased; S5. The synchronous drive scraping component (9) rotates to scrape away the foam and impurities that accumulate on the surface of the mixed solution in order to release the gas generated during the reaction and to discharge and collect the gas through the exhaust pipe (6). S6. After the polymerization reaction is complete, maintain the reaction temperature, stop stirring, and allow it to mature. After maturation, filter to obtain polyaluminum sulfate flocculant.

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