Cooling reaction kettle for potassium fluoride production

Abstract

The utility model relates to the field of reaction kettles, and discloses a cooling reaction kettle for potassium fluoride production, which comprises a potassium fluosilicate preparation unit, the potassium fluosilicate preparation unit comprises a potassium fluoride reaction kettle, one side of the potassium fluoride reaction kettle is connected with a screw conveyer and a pipeline, and the screw conveyer and the pipeline are used for feeding water and solid potassium fluosilicate into the potassium fluoride reaction kettle; stirring and heating to prepare 35% potassium fluosilicate slurry; the potassium hydroxide solution preparation unit comprises a potassium hydroxide pool and a tank area, and the potassium hydroxide pool is connected with the tank area. According to the device, potassium fluosilicate and potassium hydroxide can be subjected to synchronous alkaline hydrolysis and filter pressing through synchronous preparation of a fluosilicic acid solution and a potassium hydroxide solution, so that the waste of raw materials is reduced, the production efficiency is improved, the utilization rate of washing water of filter residues is high, and more types of byproducts can be obtained.

Description

Technical Field

[0001] The utility model relates to the field of reaction kettles, in particular to a cooling reaction kettle for potassium fluoride production. Background Art

[0002] In the prior art, the cooling reactor mainly uses fluorosilicic acid as a raw material to prepare potassium fluoride for the production of potassium chloride. The specific process includes adding fluorosilicic acid to the reactor, adding a silicon complexing agent, adding ammonia water at a uniform speed, and fully reacting. The reaction filtrate is then subjected to solid-liquid separation, and the solid is pulped and cleaned to obtain high-purity silicon dioxide, which is dried to obtain white carbon black. After the liquid is filtered, the filtrate enters the filtrate tank. Next, the reaction liquid is added to the cooling reactor, liquid potassium hydroxide is added, steam is introduced, and the ammonia generated by the reaction is absorbed as ammonia water through a cooling cycle. The reaction liquid is added to a transfer tank, precipitated for 24 hours, and the clear liquid is added to a concentrating kettle for concentration. Finally, the concentrated potassium fluoride mother liquor is added to the spray tank, and then the spray tank is placed in a spray drying tower, and the finished product is anhydrous potassium fluoride.

[0003] At present, the mainstream potassium fluoride production on the market mainly uses fluorosilicic acid and silicon complexing agents to prepare potassium chloride products. Potassium hydroxide is added after solid-liquid separation, which easily introduces impurities, affects product quality, and leads to reduced production efficiency. At the same time, the utilization rate of washing water for filter residue is not good, so the types of by-products (white carbon black) that can be obtained are relatively small. Utility Model Content

[0004] To achieve the above purpose, the utility model is implemented through the following technical solutions: a cooling reactor for potassium fluoride production, comprising: a potassium fluorosilicate preparation unit, the potassium fluorosilicate preparation unit comprises a potassium fluoride reactor, one side of the potassium fluoride reactor is connected with a screw conveyor and a pipeline, which is used to prepare a 35% potassium fluorosilicate slurry by adding water and solid potassium fluorosilicate, stirring and heating; a potassium hydroxide solution preparation unit, the potassium hydroxide solution preparation unit comprises a potassium hydroxide pool and a tank area, the potassium hydroxide pool is connected to the tank area, and is used to mix fresh water and recycled water with potassium hydroxide to prepare a 48% potassium hydroxide solution and inject it into the tank area; an alkaline hydrolysis reaction unit, the alkaline hydrolysis reaction unit comprises a feed pump 1, the feed pump 1 is arranged between the tank area and the potassium fluoride reactor, and is used to add the potassium hydroxide solution into the potassium fluoride reactor, and after stirring and mixing evenly, the temperature is raised to 60°C and maintained at 48%. The mixture is stirred for 6 hours to complete the alkaline hydrolysis reaction; a filter press unit, the filter press unit includes a filter press, the upper part of the potassium fluoride reactor is connected to a reaction liquid pump, the potassium fluoride reactor is connected to the filter press through the reaction liquid pump, and the reaction liquid is filtered through the filter press to obtain a potassium fluoride solution; a double-effect concentration unit, the double-effect concentration unit includes a sinking tank and a double-effect evaporator, the sinking tank is used to store the potassium fluoride solution, a feed pump 2 is provided between the sinking tank and the double-effect evaporator, the double-effect evaporator is connected to a second sinking tank and a feeding tank, and is used to concentrate the potassium fluoride solution to 45% and then send it to the second sinking tank and the feeding tank; an anhydrous potassium fluoride production unit, the anhydrous potassium fluoride production unit includes a spray dryer and a packaging device, a feed pump 3 is provided between the spray dryer and the feeding tank, the spray dryer is used to spray-dry the potassium fluoride solution into anhydrous potassium fluoride, and the packaging device packages the finished anhydrous potassium fluoride.

[0005] In one embodiment, the operating pressure of the alkaline hydrolysis reaction unit is normal pressure, and the operating temperature is 65°C.

[0006] In one embodiment, the double-effect evaporator is composed of two evaporators connected in series, steam is introduced into the first effect to heat the potassium fluoride solution therein, and the generated steam is introduced into the second effect as heating steam, and this process is repeated until the last effect.

[0007] In one embodiment, the spray drying uses hot air to evaporate the water in the material, and the liquid material is sprayed into extremely fine mist droplets through high-speed spraying, which is in co-current contact with the hot air and dried into anhydrous potassium fluoride in a short time.

[0008] In one embodiment, it also includes: a washing centrifugal unit, which includes a washing tank and a centrifuge, a conveying part is provided between the washing tank and the filter press, and a washing pump is provided between the washing tank and the centrifuge. The washing centrifugal unit is used to wash the filter residue with a potassium fluoride solution and to obtain a semi-finished silicon dioxide product by centrifugal separation.

[0009] In one embodiment, the conveying part is a belt.

[0010] In one embodiment, it also includes: a silicon dioxide production unit, which includes a drum dryer, which is used to further dry the silicon dioxide semi-finished product to obtain silicon dioxide; a sodium silicate production unit, which includes a sodium silicate reactor and a sodium hydroxide tank, which are used to stir and fully dissolve fresh water and caustic soda in the sodium hydroxide tank to prepare a 48% sodium hydroxide solution for standby use, and the sodium silicate reactor prepares a sodium silicate solution from the silicon dioxide semi-finished product and the sodium hydroxide solution; a potassium silicate production unit, which includes a potassium silicate reactor, which is used to prepare a potassium silicate solution from the silicon dioxide semi-finished product and the potassium hydroxide solution through the potassium silicate reactor.

[0011] In one embodiment, a stirring mechanism is provided in the potassium fluoride reactor, and the stirring mechanism includes a motor, and the output end of the motor is connected to a stirring shaft, and a first ring plate is sleeved on the surface of the stirring shaft, and four fixed grooves are provided on the surface of the first ring plate, and blades are provided in each of the four fixed grooves, and a control component for controlling the folding of the blades is provided in the stirring shaft.

[0012] In one embodiment, the control component includes four folding arms, the tops of the four blades are provided with grooves, one ends of the four folding arms are respectively arranged in the corresponding four grooves, the surface of the stirring shaft is provided with a second ring plate, the second ring plate is located above the first ring plate, the bottom of the second ring plate is provided with four mounting grooves, and the other ends of the four folding arms are respectively arranged in the corresponding four mounting grooves.

[0013] In one embodiment, a moving block is connected to the inner ring of the second ring plate, and a long moving groove is provided on the surface of the stirring shaft. The moving block is arranged in the moving groove, and the side of the moving block is close to the inner wall of the moving groove. A threaded hole is opened at the top of the moving block, and a screw rod is provided in the moving groove. The screw rod and the corresponding thread in the threaded hole form a tight rotation connection, and a rotating groove is provided on the top surface of the stirring shaft. A rotating wheel is connected in the rotating groove, and the top end of the screw rod extends into the rotating groove and is connected to the bottom of the rotating wheel.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. By synchronously configuring the fluorosilicic acid solution and the potassium hydroxide solution, and synchronously performing alkaline hydrolysis, filter pressing and precipitation on potassium fluorosilicate and potassium hydroxide, the waste of raw materials is reduced, the production efficiency is improved, the utilization rate of washing water for filter residue is high, and a wide variety of by-products can be obtained; 2. By providing a foldable stirring mechanism, the stirring blades can be placed in the reactor in a folded state, which is suitable for the opening sizes of different reactor bodies and will not be subject to size restrictions when loading and disassembling the stirring mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1It is a structural schematic diagram of the utility model.

[0016] Figure 2 It is a structural schematic diagram of the stirring mechanism of the utility model.

[0017] Figure 3 It is a schematic diagram of the folded state of the stirring mechanism of the utility model.

[0018] Figure 4 It is a cross-sectional view of the stirring shaft, the first ring plate, the blades, the second ring plate, the folding arm, the screw and the rotating wheel of the utility model.

[0019] Figure 5 for Figure 4 Enlarged view of point A in the middle.

[0020] The accompanying drawings in the figure are marked as follows: 1. potassium fluoride reactor; 101. motor; 102. stirring shaft; 103. first ring plate; 104. blades; 105. second ring plate; 106. folding arm; 107. fixed groove; 108. groove; 109. movable groove; 110. movable block; 111. screw rod; 112. rotor; 2. pipeline; 3. screw conveyor; 4. potassium hydroxide pool; 5. tank area; 6. feed pump 1; 7. filter press; 8. reaction liquid pump; 9. first sinking tank; 10. double-effect evaporator; 11. feed pump 2; 12. second sinking tank; 13. feeding tank; 14. spray dryer; 15. feed pump 3; 16. washing tank; 17. conveying part; 18. centrifuge; 19. washing pump; 20. drum dryer; 21. sodium silicate reactor; 22. potassium silicate reactor. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiments of the utility model clearer, the technical solution in the embodiments of the utility model is described clearly and completely. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] The embodiment of the present application provides a cooling reactor for potassium fluoride production, which solves the problem that potassium hydroxide is easily introduced into the reactor after solid-liquid separation, resulting in reduced production efficiency and poor utilization of washing water for filter residue. When in use, the synchronous configuration of fluorosilicic acid solution and potassium hydroxide solution, as well as the synchronous alkaline hydrolysis, filter pressing, precipitation, potassium fluoride solution concentration, potassium fluoride drying and packaging of potassium fluorosilicate and potassium hydroxide are realized, thereby reducing the waste of raw materials, improving production efficiency, achieving high utilization of washing water for filter residue, and obtaining a wide variety of by-products.

[0023] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0024] Reference Figure 1 A cooling reactor for potassium fluoride production, comprising: a potassium fluorosilicate preparation unit, the potassium fluorosilicate preparation unit comprising a potassium fluoride reactor 1, a screw conveyor 3 and a pipeline 2 are connected to one side of the potassium fluoride reactor 1, a certain amount of water is added to the potassium fluoride reactor 1 through the pipeline 2, and then the solid potassium fluorosilicate is put into the reactor by the screw conveyor 3, and after stirring and heating, it is prepared into a 35% potassium fluorosilicate slurry for standby use; refer to Figure 1 , potassium hydroxide solution preparation unit, the potassium hydroxide solution preparation unit includes a potassium hydroxide pool 4 and a tank area 5, the potassium hydroxide pool 4 is connected to the tank area 5, fresh water and recycled water are pumped into the potassium hydroxide pool 4, and the purchased bagged potassium hydroxide is added into the potassium hydroxide pool 4 through a negative pressure feeder, and stirred to fully dissolve, and a 48% potassium hydroxide solution is prepared and pumped into the tank area 5 for standby use; refer to Figure 1 , the alkaline hydrolysis reaction unit includes a feed pump 6, which is arranged between the tank area 5 and the potassium fluoride reactor 1. A certain amount of potassium hydroxide solution is pumped into the potassium fluoride reactor 1 from the tank area 5 by the feed pump 6, and after stirring and mixing evenly, the steam is stopped after the temperature is raised to 60°C, and stirring is continued for 6 hours. The reaction is completed when the residual rate of potassium fluorosilicate is less than 0.1% after sampling and detection; refer to Figure 1 , filter press unit, the filter press unit includes a filter press 7, the upper part of the potassium fluoride reactor 1 is connected to a reaction liquid pump 8, the potassium fluoride reactor 1 is connected to the filter press 7 through the reaction liquid pump 8, the reaction liquid is pumped from the upper part of the reactor to the filter press 7 through the reaction liquid pump 8, the operating pressure of the reaction process is normal pressure, and the operating temperature is 50~80℃; refer to Figure 1 , double-effect concentration unit, the double-effect concentration unit includes a sinking tank 9 and a double-effect evaporator 10, the reaction liquid is filtered by a filter press 7 to obtain a potassium fluoride solution that flows into the sinking tank 9 for standby use, a feed pump 11 is arranged between the sinking tank 9 and the double-effect evaporator 10, the double-effect evaporator 10 is connected to a second sinking tank 12 and a feeding tank 13, the potassium fluoride solution in the sinking tank 9 is sent to the double-effect evaporator 10 in the tank area 5 through the feed pump 11, the double-effect evaporator 10 is composed of two evaporators connected in series, steam is introduced into the first effect, the potassium fluoride solution therein is heated, and the generated steam is introduced into the second effect as heating steam, this process is repeated until the last effect, the potassium fluoride solution is concentrated to 45-50% in the double-effect evaporator 10, and sent to the second sinking tank 12 and the feeding tank 13 for standby use; refer to Figure 1, anhydrous potassium fluoride production unit, the anhydrous potassium fluoride production unit includes a spray dryer 14 and packaging equipment, a feed pump 3 15 is provided between the spray dryer 14 and the feeding tank 13, the potassium fluoride solution in the feeding tank 13 is sent to the spray dryer 14 for drying through the feed pump 3 15, spray drying is to use hot air to evaporate the water in the material, natural gas enters the hot air furnace for combustion, heats the filtered air, and enters the air distributor at the top of the dryer, the hot air enters the drying chamber in a spiral shape and uniformly, the feed liquid and the heated air are in parallel flow contact and can be dried into a finished product in a very short time, the feed liquid is sprayed into extremely fine mist liquid beads by the high-speed centrifugal atomizer or high-pressure atomizer at the top of the tower body, and can be dried into anhydrous potassium fluoride in a very short time in parallel flow contact with the air; refer to Figure 1 , washing centrifugal unit, the washing centrifugal unit includes a washing tank 16 and a centrifuge 18, a conveying part 17 is provided between the washing tank 16 and the filter press 7, a washing pump 19 is provided between the washing tank 16 and the centrifuge 18, the filter residue obtained by the filter press is transported to the washing tank 16 for washing through the conveying part 17, the washing water is sent to the centrifuge 18 for separation through the washing pump 19, the solid obtained by centrifugation is a semi-finished silicon dioxide product, which is packed in ton bags for standby use, and the centrifugal liquid is recycled to the potassium fluoride reactor 1, and the conveying part 17 adopts a belt.

[0025] Reference Figure 1 , a silicon dioxide production unit, which includes a drum dryer 20. The silicon dioxide semi-finished product produced by potassium fluoride is poured into a feeding hopper and transported to the drum dryer 20 through a screw feeder. The hot air generated by the combustion of natural gas enters from the discharge end and is discharged from the upper part of the feed end, so that it is fully in contact with the hot air flow to improve the drying efficiency and move the material forward. The material discharged from the drum dryer 20 is transported to the packaging place through the drum and packaged for sale; refer to Figure 1 , sodium silicate production unit, the unit includes a sodium silicate reactor 21 and a sodium hydroxide tank, fresh water is pumped into the sodium hydroxide tank, the purchased bagged caustic soda flakes are manually poured into the screw conveyor 3 in the feeding room, added to the sodium hydroxide tank through the screw conveyor 3, and stirred to fully dissolve and prepare a 48% NaOH solution for standby use, the semi-finished silicon dioxide is put into the sodium silicate reactor 21 through the screw conveyor 3, the 48% sodium hydroxide solution is pumped into the reactor in proportion, heated to 80-100°C with electric heating and then stopped heating, the reaction is completed after stirring for 2 hours, and the obtained water glass / sodium silicate solution is partially sent to the tank area tank truck for sale through the sodium silicate reaction liquid pump, and partially sent to the filling machine for canning and then sold; refer to Figure 1 , a potassium silicate production unit, which includes a potassium silicate reactor 22. Semi-finished silicon dioxide is put into the potassium silicate reactor 22 through a screw conveyor 3, and a 48% potassium hydroxide solution is pumped into the reactor in proportion. The reaction is completed after being heated to 80-100°C by electric heating, and the reaction is completed after stirring for 2 hours. The obtained potassium silicate solution is partially sent to the tank area tank truck for sale through a potassium silicate reaction liquid pump, and partially sent to the filling machine for canning and then sold.

[0026] Reference Figure 2-5 The potassium fluoride reactor 1 is provided with a stirring mechanism, which includes a motor 101, a stirring shaft 102 is fixedly connected to the output end of the motor 101, a first ring plate 103 is fixedly sleeved on the surface of the stirring shaft 102, four fixed grooves 107 are provided on the surface of the first ring plate 103, four blades 104 are rotatably connected in the four fixed grooves 107, a control component for controlling the folding of the blades 104 is provided in the stirring shaft 102, the control component includes four folding arms 106, grooves 108 are provided on the tops of the four blades 104, one end of the four folding arms 106 is rotatably connected in the corresponding four grooves 108, a second ring plate 105 is slidably sleeved on the surface of the stirring shaft 102, and the second ring plate 105 is located above the first ring plate 103, Four connecting grooves are provided at the bottom of the second ring plate 105, and the other ends of the four folding arms 106 are respectively arranged in the corresponding four connecting grooves. A moving block 110 is fixedly connected to the inner ring of the second ring plate 105. A long moving groove 109 is provided on the surface of the stirring shaft 102. The moving block 110 is slidably connected in the moving groove 109, and the side of the moving block 110 is tightly attached to the inner wall of the moving groove 109. A threaded hole is provided at the top of the moving block 110, and a screw rod 111 is provided in the moving groove 109. The screw rod 111 forms a tight rotational connection with the corresponding thread in the threaded hole. A rotating groove is provided on the top surface of the stirring shaft 102, and a rotating wheel 112 is rotatably connected in the rotating groove. The top end of the screw rod 111 extends into the rotating groove and is fixedly connected to the bottom of the rotating wheel 112.

[0027] This arrangement allows the stirring blades 104 to be placed in the reactor in a folded state, which is suitable for opening sizes of different reactor bodies and will not be subject to size restrictions when loading and disassembling the stirring mechanism. After the blades are placed in the reactor body, the four blades 104 can be controlled to rotate and unfold at the same time by rotating the wheel 112 on the stirring shaft 102. The specific operation is to place the stirring mechanism in a folded state into the reactor body through the reserved hole on the reactor body, rotate the wheel 112, and the wheel 112 controls the rotation of the screw rod 111. The screw rod 111 controls the moving block 110 to move vertically downward in the moving groove 109. The moving block 110 drives the second ring plate 105 to move on the stirring shaft 102. As the second ring plate 105 moves downward, the folding arm 106 rotatably connected to it also rotates. The folding arm 106 also pushes the blades 104 at the same time, so that the blades 104 rotate and unfold in the groove 108.

[0028] During use, a certain amount of water is added to the potassium fluoride reactor 1 through the pipeline 2, and then the solid potassium fluorosilicate is put into the reactor by the screw conveyor 3. After stirring and heating, it is prepared into a 35% potassium fluorosilicate slurry for standby use. Fresh water and recycled water are pumped into the potassium hydroxide pool 4, and the purchased bagged potassium hydroxide is added into the potassium hydroxide pool 4 through the negative pressure feeder. Stirring is started to fully dissolve, and a 48% potassium hydroxide solution is prepared and pumped into the tank area 5 for standby use. A certain amount of potassium hydroxide solution is pumped into the potassium fluoride reactor 1 from the tank area 5 using a pump 6, and the folded stirring mechanism is placed inside the reactor through the reserved hole on the reactor body, and the rotating wheel 112 is rotated, and the rotating wheel 112 controls the screw rod 111 The screw rod 111 controls the moving block 110 to move vertically downward in the moving groove 109, and the moving block 110 drives the second ring plate 105 to move on the stirring shaft 102. As the second ring plate 105 moves downward, the folding arm 106 connected to it also rotates. The folding arm 106 also pushes the blade 104 to rotate and unfold in the groove 108. Then the motor 101 is fixedly connected to the top of the potassium fluoride reactor 1. Turning on the motor 101 can drive the four blades 104 on the stirring shaft 102 to rotate. After stirring and mixing evenly, the steam is stopped after the temperature is raised to 60°C, and stirring is continued for 6 hours. The potassium fluorosilicate residual rate is less than 0.1% is the reaction completed, the reaction liquid is pumped from the upper part of the kettle to the filter press 7 through the reaction liquid pump 8, the operating pressure of the reaction process is normal pressure, the operating temperature is 50-80°C, the potassium fluoride solution in the first settling tank 9 is sent to the double-effect evaporator 10 in the tank area 5 through the feed pump 11, the double-effect evaporator 10 is composed of two evaporators connected in series, the steam is introduced into the first effect, the potassium fluoride solution therein is heated, and the generated steam is introduced into the second effect as heating steam, this process is repeated until the last effect, the potassium fluoride solution is concentrated to 45-50% in the double-effect evaporator 10, and sent to the second settling tank 12 and the feeding tank 13 for standby use, and the potassium fluoride solution in the feeding tank 13 is sent to the spray dryer 1 through the feed pump 3 15 4. Spray drying uses hot air to evaporate the moisture in the material. Natural gas enters the hot air furnace for combustion, heats the filtered air, and enters the air distributor at the top of the dryer. The hot air enters the drying chamber in a spiral shape and evenly. The material liquid contacts the heated air in parallel flow and can be dried into a finished product in a very short time. The material liquid is sprayed into extremely fine mist liquid beads by the high-speed centrifugal atomizer or high-pressure atomizer at the top of the tower body. It can be dried into anhydrous potassium fluoride in a very short time when it contacts the air in parallel flow. The filter residue obtained by pressure filtration is transported to the washing tank 16 for washing through the conveying part 17. The washing water is sent to the centrifuge 18 for separation through the washing pump 19. The solid obtained by centrifugation is a semi-finished silicon dioxide product, which is packed in ton bags for standby use. The centrifugal liquid is recycled into the potassium fluoride reactor 1. The conveying part 17 adopts a belt. The semi-finished silicon dioxide produced by potassium fluoride is poured into the feeding hopper and transported to the drum dryer 20 through a screw feeder. The hot air generated by the combustion of natural gas enters from the discharge end and is discharged from the upper part of the feed end, so that it is fully in contact with the hot air flow to improve the drying efficiency and move the material forward. The material discharged from the drum dryer 20 is conveyed to the packaging place through the drum and packaged for sale. Fresh water is pumped into the sodium hydroxide tank, and the purchased bagged caustic soda is manually poured into the screw conveyor 3 in the feeding room. The sodium hydroxide tank is added through the screw conveyor 3, and the stirring is turned on to fully dissolve and configure it into a 48% NaOH solution for standby use. The semi-finished silicon dioxide is passed through the screw conveyor. The screw conveyor 3 is put into the sodium silicate reaction kettle 21, and the 48% sodium hydroxide solution is pumped into the kettle in proportion. After heating to 80-100℃ with electric heating, the heating is stopped. After stirring for 2 hours, the reaction is completed. The obtained water glass / sodium silicate solution is partially sent to the tank area tank truck for sale through the sodium silicate reaction liquid pump, and the part is sent to the filling machine for canning and then sold. The semi-finished silicon dioxide product is put into the potassium silicate reaction kettle 22 through the screw conveyor 3, and the 48% potassium hydroxide solution is pumped into the kettle in proportion. After heating to 80-100℃ with electric heating, the heating is stopped. After stirring for 2 hours, the reaction is completed. The obtained potassium silicate solution is partially sent to the tank area tank truck for sale through the potassium silicate reaction liquid pump, and the part is sent to the filling machine for canning and then sold. .

[0029] In summary, compared with the prior art, the present invention has the following beneficial effects: by synchronously configuring the fluorosilicic acid solution and the potassium hydroxide solution, potassium fluorosilicate and potassium hydroxide can be simultaneously alkaline hydrolyzed and filtered, which reduces the waste of raw materials, improves production efficiency, has a high utilization rate of washing water for filter residues, and can obtain a wider variety of by-products.

[0030] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0031] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cooling reactor for potassium fluoride production, characterized in that: include: A potassium fluorosilicate preparation unit, comprising a potassium fluoride reaction kettle (1), one side of the potassium fluoride reaction kettle (1) being connected to a screw conveyor (3) and a pipeline (2), for preparing a 35% potassium fluorosilicate slurry by adding water and solid potassium fluorosilicate, stirring and heating; A potassium hydroxide solution preparation unit, the potassium hydroxide solution preparation unit comprising a potassium hydroxide pool (4) and a tank area (5), the potassium hydroxide pool (4) being connected to the tank area (5) and being used to mix and stir fresh water and recycled water with potassium hydroxide to prepare a 48% potassium hydroxide solution and pump it into the tank area (5); An alkaline hydrolysis reaction unit, the alkaline hydrolysis reaction unit comprising a feed pump (6), the feed pump (6) being arranged between the tank area (5) and the potassium fluoride reaction kettle (1), and being used to add potassium hydroxide solution into the potassium fluoride reaction kettle (1), stirring and mixing the solution, and then heating the solution to 60° C. and maintaining stirring for 6 hours to complete the alkaline hydrolysis reaction; A filter press unit, the filter press unit comprising a filter press (7), the upper part of the potassium fluoride reaction kettle (1) being connected to a reaction liquid pump (8), the potassium fluoride reaction kettle (1) being connected to the filter press (7) via the reaction liquid pump (8), for filtering the reaction liquid through the filter press (7) to obtain a potassium fluoride solution; A double-effect concentration unit, the double-effect concentration unit comprising a sinking tank (9) and a double-effect evaporator (10), the sinking tank (9) being used to store a potassium fluoride solution, a second feed pump (11) being provided between the sinking tank (9) and the double-effect evaporator (10), the double-effect evaporator (10) being connected to a second sinking tank (12) and a feeding tank (13) for concentrating the potassium fluoride solution to 45% and then sending it to the second sinking tank (12) and the feeding tank (13); An anhydrous potassium fluoride production unit, the anhydrous potassium fluoride production unit comprising a spray dryer (14) and packaging equipment, a feeding pump (15) is provided between the spray dryer (14) and a feeding tank (13), the spray dryer (14) is used to spray-dry a potassium fluoride solution into anhydrous potassium fluoride, and the packaging equipment packages the finished anhydrous potassium fluoride.

2. A cooling reactor for potassium fluoride production according to claim 1, characterized in that: The double-effect evaporator (10) consists of two evaporators connected in series.

3. A cooling reactor for potassium fluoride production according to claim 1, characterized in that: Also includes: A washing centrifugal unit, the washing centrifugal unit comprising a washing tank (16) and a centrifuge (18), a conveying portion (17) being provided between the washing tank (16) and the filter press (7), a washing pump (19) being provided between the washing tank (16) and the centrifuge (18), the washing centrifugal unit being used for washing filter residue with a potassium fluoride solution and for centrifugation to obtain a silicon dioxide semi-finished product.

4. A cooling reactor for potassium fluoride production according to claim 3, characterized in that: The conveying part (17) adopts a belt.

5. A cooling reactor for potassium fluoride production according to claim 3, characterized in that: Also includes: A silicon dioxide production unit, the unit comprising a drum dryer (20) for further drying the silicon dioxide semi-finished product to obtain silicon dioxide; A sodium silicate production unit, comprising a sodium silicate reaction kettle (21) and a sodium hydroxide tank, for stirring and fully dissolving fresh water and caustic soda flakes in the sodium hydroxide tank to prepare a 48% sodium hydroxide solution for standby use; the sodium silicate reaction kettle (21) prepares a sodium silicate solution by mixing the silicon dioxide semi-finished product with the sodium hydroxide solution; A potassium silicate production unit comprises a potassium silicate reaction kettle (22) for preparing a potassium silicate solution from a silicon dioxide semi-finished product and a potassium hydroxide solution through the potassium silicate reaction kettle (22).

6. A cooling reactor for potassium fluoride production according to claim 1, characterized in that: The potassium fluoride reaction kettle (1) is provided with a stirring mechanism, the stirring mechanism comprising a motor (101), the output end of the motor (101) being connected to a stirring shaft (102), the surface of the stirring shaft (102) being sleeved with a first ring plate (103), the surface of the first ring plate (103) being provided with four fixing grooves (107), blades (104) being provided in each of the four fixing grooves (107), and a control component for controlling the folding of the blades (104) being provided in the stirring shaft (102).

7. A cooling reactor for potassium fluoride production according to claim 6, characterized in that: The control component comprises four folding arms (106), the tops of the four blades (104) are each provided with a groove (108), one end of the four folding arms (106) is respectively arranged in the corresponding four grooves (108), the surface of the stirring shaft (102) is sleeved with a second ring plate (105), the second ring plate (105) is located above the first ring plate (103), the bottom of the second ring plate (105) is provided with four installation grooves, and the other ends of the four folding arms (106) are respectively arranged in the corresponding four installation grooves.

8. A cooling reactor for potassium fluoride production according to claim 7, characterized in that: The inner ring of the second ring plate (105) is connected to a moving block (110); a long moving groove (109) is provided on the surface of the stirring shaft (102); the moving block (110) is arranged in the moving groove (109), and the side of the moving block (110) is in close contact with the inner wall of the moving groove (109); a threaded hole is provided at the top of the moving block (110); a screw rod (111) is provided in the moving groove (109); the screw rod (111) forms a tight rotational connection with a corresponding thread in the threaded hole; a rotating groove is provided on the top surface of the stirring shaft (102); a rotating wheel (112) is connected in the rotating groove; the top of the screw rod (111) extends into the rotating groove and is connected to the bottom of the rotating wheel (112).

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