Stirring device for potassium sulfate crystallization reaction kettle

Abstract

The utility model relates to reaction kettle stirring technical field, proposed potassium sulfate crystallization reaction kettle's stirring device, including reaction kettle group, reaction kettle group includes stirring jar no.

Description

Technical Field

[0001] This utility model relates to the field of reaction vessel stirring technology, specifically to a stirring device for a potassium sulfate crystallization reaction vessel. Background Technology

[0002] In potassium sulfate ( In the industrial production of potassium sulfate, crystallization is a core process that determines product purity, crystal morphology, and production efficiency. One widely used process is the potassium sulfate metathesis method, which involves the reaction of potassium chloride (KCl) with potassium sulfate (KCl). The reaction in aqueous solution produces potassium sulfate crystals. The reaction formula is: However, this process faces the following technical bottlenecks in practical applications:

[0003] First, the solubility of potassium sulfate decreases significantly with decreasing temperature (its solubility at 0℃ is only 1 / 3 of that at 20℃), necessitating gradient cooling to achieve efficient crystallization. Traditional single-reactor reactors struggle to achieve precise segmented temperature control, resulting in slow crystallization rates and low crystal precipitation rates.

[0004] Secondly, the solid content gradually increases during the reaction (reaching over 30% in the later stages). High-viscosity slurry easily forms a crystal deposition layer at the bottom of the reactor. Conventional stirring paddles cannot achieve uniform suspension throughout the entire reactor area. This not only reduces the effective reaction area but also causes crystal agglomeration and encapsulation of the mother liquor, affecting product purity and filtration performance. In view of this, this utility model proposes a stirring device for a potassium sulfate crystallization reactor. Utility Model Content

[0005] This invention proposes a stirring device for a potassium sulfate crystallization reactor, which solves the problem of low potassium sulfate crystallization precipitation rate in the prior art.

[0006] The technical solution of this utility model is as follows: A stirring device for a potassium sulfate crystallization reactor includes a reactor assembly, which includes a stirring tank 1, a stirring tank 2, and a stirring tank 3. A potassium sulfate crystal inlet pipe communicating with the interior of stirring tank 1 is fixedly connected to one end of the top of stirring tank 1. A potassium chloride solution inlet pipe communicating with the interior of stirring tank 1 is fixedly connected to the bottom of stirring tank 1. Guide pipes are fixedly connected to the bottom of the inner sides of stirring tank 1, stirring tank 2, and stirring tank 3. A pump body is fixedly connected to the guide pipe at the bottom of stirring tank 1. The outlet end of the pump body one is fixedly connected to the circulation pipe one, which is connected to the top of the mixing tank two. The guide pipe of the mixing tank two is fixedly connected to the pump body two, and the outlet end of the pump body two is fixedly connected to the circulation pipe two. The circulation pipe two is connected to the mixing tank two and the mixing tank three. The bottom end of the mixing tank three is fixedly connected to the return pipe, and the outlet end of the return pipe is fixedly connected to the pump body three. The outlet end of the pump body three is fixedly connected to the circulation pipe three, and the outlet end of the circulation pipe three is connected to the top of the mixing tank three and the mixing tank one.

[0007] Preferably, the internal structures of the first mixing tank, the second mixing tank, and the third mixing tank are the same.

[0008] Preferably, a pump body four is fixedly connected to the outlet end of the guide pipe of the mixing tank three, and a crystal outlet pipe is fixedly connected to the outlet end of the pump body four.

[0009] Preferably, pump body one, pump body two, pump body three and pump body four are of the same model and have the same power.

[0010] Preferably, the inner sides of the first, second, and third mixing tanks are all provided with a stirring mechanism, and the inner walls of the first, second, and third mixing tanks are all provided with a cooling mechanism for cooling the potassium chloride solution.

[0011] Preferably, the stirring mechanism includes a motor fixedly installed on the top of a stirring tank, the output shaft of the motor is fixedly connected to a rotating shaft, and a plurality of connecting frames equidistantly distributed along the vertical direction are fixedly connected to the outer side of the rotating shaft, and one end of the plurality of connecting frames is fixedly connected to the same spiral stirring blade.

[0012] Preferably, the cooling mechanism includes a cooling coil fixedly connected to the inner side of the mixing tank, a chilled water inlet pipe fixedly connected to the inlet end of the cooling coil, a chilled water outlet pipe fixedly connected to the outlet end of the cooling coil, and a chilled water supply device externally connected to the inlet end of the chilled water inlet pipe.

[0013] The working principle and beneficial effects of this utility model are as follows:

[0014] 1. A three-stage series reactor (stirred tanks one, two, and three) is adopted. By gradually reducing the temperature at each stage (each stage is equipped with an independent cooling mechanism), the characteristic that the solubility of potassium sulfate decreases significantly with decreasing temperature is fully utilized to achieve gradient temperature-controlled crystallization. Compared with the traditional single-reactor reactor, the crystal precipitation rate is greatly improved, solving the problems of slow crystallization rate and low precipitation rate in the existing process.

[0015] 2. Each stage of the reactor is equipped with a built-in spiral stirring blade (driven by a motor-driven shaft). The vertically and equally spaced connecting frames achieve uniform stirring throughout the entire reactor area. This prevents crystals from depositing and clumping at the bottom of the reactor, avoids mother liquor encapsulation, and improves product purity and filtration performance. Attached Figure Description

[0016] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0017] Figure 1 This is a schematic diagram of the stirring device in the potassium sulfate crystallization reactor of this utility model;

[0018] Figure 2This is a schematic diagram of the internal structure of the mixing tank of this utility model;

[0019] Figure 3 This is a schematic diagram of the stirring mechanism of this utility model;

[0020] Figure 4 This is a schematic diagram of the cooling mechanism of this utility model.

[0021] In the diagram: 10. Stirring tank 1; 101. Potassium chloride solution inlet pipe; 102. Pump body 1; 103. Circulation pipe 1; 20. Stirring tank 2; 201. Pump body 2; 202. Circulation pipe 2; 30. Stirring tank 3; 301. Pump body 3; 302. Return pipe; 303. Pump body 4; 304. Crystal outlet pipe; 305. Circulation pipe 3; 40. Potassium sulfate crystal inlet pipe; 50. Guide pipe; 200. Stirring mechanism; 2001. Rotating shaft; 2002. Connecting frame; 2003. Spiral stirring blade; 2004. Motor; 300. Cooling mechanism; 3001. Cooling coil; 3002. Chilled water inlet pipe; 3003. Chilled water outlet pipe. Detailed Implementation

[0022] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this utility model.

[0023] like Figures 1-4As shown in the figure, this embodiment proposes a stirring device for a potassium sulfate crystallization reactor, including a reactor group. The reactor group includes a stirring tank 10, a stirring tank 20, and a stirring tank 30. The internal structures of stirring tanks 10, 20, and 30 are the same. One end of the top of stirring tank 10 is fixedly connected to a potassium sulfate crystal inlet pipe 40 communicating with the inside of stirring tank 10. The bottom end of stirring tank 10 is fixedly connected to a potassium chloride solution inlet pipe 101 communicating with the inside of stirring tank 10. The bottom of the inner side of stirring tanks 10, 20, and 30 are all fixedly connected to guide pipes 50. The guide pipe 50 at the bottom of stirring tank 10 is fixedly connected to a pump body 102. The outlet end of pump body 102 is fixedly connected to a circulation pipe 103. The circulation pipe 103 is connected to the top of stirring tank 20. The mixing tank 20 is connected to the flow guide pipe 50, which is fixedly connected to the pump body 201. The outlet end of the pump body 201 is fixedly connected to the circulation pipe 202, which is connected to the mixing tank 20 and the mixing tank 30. The bottom end of the mixing tank 30 is fixedly connected to the return pipe 302, which is fixedly connected to the outlet end of the return pipe 302. The outlet end of the pump body 301 is fixedly connected to the outlet end of the pump body 301, which is fixedly connected to the circulation pipe 305. The outlet end of the circulation pipe 305 is connected to the top end of the mixing tank 30 and the mixing tank 10. The outlet end of the flow guide pipe 50 of the mixing tank 30 is fixedly connected to the pump body 403, which is fixedly connected to the outlet end of the pump body 403. The outlet end of the pump body 403 is fixedly connected to the crystal outlet pipe 304. The pump body 102, pump body 201, pump body 301 and pump body 403 are of the same model and have the same power.

[0024] Potassium chloride solution and potassium sulfate crystals are introduced into stirred tank 10 through potassium chloride solution inlet pipe 101 and potassium sulfate crystal inlet pipe 40, respectively. Potassium chloride and potassium sulfate react to generate potassium sulfate solution. Then, potassium sulfate solution is introduced into stirred tank 20 and stirred tank 30 through pump 102 and pump 201, respectively. This causes the solubility of potassium sulfate to decrease significantly as the temperature decreases, resulting in preferential precipitation. Finally, potassium sulfate crystals are discharged through pump 403. Potassium sulfate crystals are prepared through multi-stage circulating cooling, which greatly improves the precipitation rate of potassium sulfate crystals.

[0025] Furthermore, stirring mechanisms 200 are provided on the inner sides of stirring tank 10, stirring tank 20, and stirring tank 30. The stirring mechanism 200 includes a motor 2004 fixedly installed on the top of stirring tank 10. The output shaft of the motor 2004 is fixedly connected to a rotating shaft 2001. Several connecting frames 2002 are fixedly connected to the outer side of the rotating shaft 2001, which are distributed at equal intervals along the vertical direction. One end of the several connecting frames 2002 is fixedly connected to the same spiral stirring blade 2003.

[0026] After the potassium chloride solution and potassium sulfate crystals are introduced into the mixing tank 10, the motor 2004 drives the rotating shaft 2001 to rotate, which in turn drives the connecting frame 2002 to rotate the spiral stirring blades 2003 synchronously. This allows the spiral stirring blades 2003 to stir the mixture of potassium chloride solution and potassium sulfate crystals, ensuring that the potassium chloride solution and potassium sulfate crystals react fully, effectively increasing the amount of potassium sulfate produced, and thus increasing the amount of potassium sulfate crystals precipitated.

[0027] Furthermore, the inner walls of the first mixing tank 10, the second mixing tank 20, and the third mixing tank 30 are all equipped with cooling mechanisms 300 for cooling the potassium chloride solution. The cooling mechanism 300 includes a cooling coil 3001 fixedly connected to the inner side of the first mixing tank 10. A chilled water inlet pipe 3002 is fixedly connected to the inlet end of the cooling coil 3001, and a chilled water outlet pipe 3003 is fixedly connected to the outlet end of the cooling coil 3001. A chilled water supply device is externally connected to the inlet end of the chilled water inlet pipe 3002.

[0028] Chilled water is introduced into the cooling coil 3001 through the chilled water inlet pipe 3002. After contacting the cooling coil 3001, the potassium sulfate solution exchanges heat with the chilled water, which lowers the temperature of the potassium sulfate solution and reduces its solubility. The potassium sulfate solution can then be introduced into the stirred tank 20 and stirred tank 30 through pump body 102 and pump body 201 in sequence for gradual cooling. This causes the solubility of potassium sulfate to decrease significantly with decreasing temperature, resulting in preferential precipitation and greatly improving the precipitation rate of potassium sulfate crystals.

[0029] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A stirring device for a potassium sulfate crystallization reactor, comprising a reactor group, characterized in that, The reaction vessel assembly includes a first stirred tank (10), a second stirred tank (20), and a third stirred tank (30). A potassium sulfate crystal inlet pipe (40) communicating with the interior of the first stirred tank (10) is fixedly connected to one end of the top of the first stirred tank (10). A potassium chloride solution inlet pipe (101) communicating with the interior of the first stirred tank (10) is fixedly connected to the bottom of the first stirred tank (10). Guide pipes (50) are fixedly connected to the bottom of the inner sides of the first stirred tank (10), the second stirred tank (20), and the third stirred tank (30). A pump body (102) is fixedly connected to the guide pipe (50) at the bottom of the first stirred tank (10). A circulation pipe (103) is fixedly connected to the outlet end of the pump body (102). The first ring pipe (103) is connected to the top of the second mixing tank (20). The guide pipe (50) of the second mixing tank (20) is fixedly connected to the second pump body (201). The outlet end of the second pump body (201) is fixedly connected to the second circulation pipe (202). The second circulation pipe (202) is connected to the second mixing tank (20) and the third mixing tank (30). The bottom end of the third mixing tank (30) is fixedly connected to the return pipe (302). The outlet end of the return pipe (302) is fixedly connected to the third pump body (301). The outlet end of the third pump body (301) is fixedly connected to the third circulation pipe (305). The outlet end of the third circulation pipe (305) is connected to the top of the third mixing tank (30) and the first mixing tank (10).

2. The stirring device for the potassium sulfate crystallization reactor according to claim 1, characterized in that, The internal structures of the first (10), the second (20), and the third (30) mixing tanks are the same.

3. The stirring device for the potassium sulfate crystallization reactor according to claim 2, characterized in that, The outlet end of the guide pipe (50) of the stirring tank three (30) is fixedly connected to the pump body four (303), and the outlet end of the pump body four (303) is fixedly connected to the crystal outlet pipe (304).

4. The stirring device of the potassium sulfate crystallization reactor according to claim 3, characterized in that, The pump body one (102), pump body two (201), pump body three (301) and pump body four (303) are of the same model and have the same power.

5. The stirring device of the potassium sulfate crystallization reactor according to claim 1, characterized in that, The inner sides of the first (10), the second (20) and the third (30) are all provided with stirring mechanisms (200), and the inner walls of the first (10), the second (20) and the third (30) are all provided with cooling mechanisms (300) for cooling the potassium chloride solution.

6. The stirring device of the potassium sulfate crystallization reactor according to claim 5, characterized in that, The stirring mechanism (200) includes a motor (2004) fixedly installed on the top of the stirring tank (10). The output shaft of the motor (2004) is fixedly connected to a rotating shaft (2001). Several connecting frames (2002) are fixedly connected to the outside of the rotating shaft (2001) at equal intervals along the vertical direction. One end of each of the several connecting frames (2002) is fixedly connected to the same spiral stirring blade (2003).

7. The stirring device of the potassium sulfate crystallization reactor according to claim 5, characterized in that, The cooling mechanism (300) includes a cooling coil (3001) fixedly connected to the inside of the mixing tank (10). The inlet end of the cooling coil (3001) is fixedly connected to a chilled water inlet pipe (3002), and the outlet end of the cooling coil (3001) is fixedly connected to a chilled water outlet pipe (3003). The inlet end of the chilled water inlet pipe (3002) is externally connected to a chilled water supply device.

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