Potassium chloride and sodium chloride salt-leaching potassium-producing purifying device

Abstract

The utility model relates to a potassium chloride and sodium chloride salt-leaching potassium-producing purifying device, and belongs to the technical field of chemical equipment. Comprising a first-stage dissolving tank, a second-stage dissolving tank, a potassium crystallizer, a potassium clear liquid tank, a sodium crystallizer, a sodium centrifugal machine and a sodium mother liquid tank which are sequentially communicated through pipelines, a liquid outlet of the sodium mother liquid tank is communicated with the sodium crystallizer; the sodium crystallizer is also communicated with an inlet of the cyclone liquid demister; a steam outlet of the hydrocyclone demister is communicated with the heater through the compressor, and a water outlet of the hydrocyclone demister is communicated with the condensate water tank; a water outlet of the heater is communicated with the condensate water tank; the potassium crystallizer is further communicated with a potassium cyclone, the potassium cyclone is communicated with a potassium centrifugal machine, the potassium centrifugal machine is communicated with a potassium mother liquor tank, and the potassium mother liquor tank is further communicated with the potassium crystallizer. The device is suitable for high-potassium and low-sodium mixed salt separation, and is low in comprehensive energy consumption and low in operation cost; potassium chloride and sodium chloride treated by the device can meet the requirements of industrial application, can be sold to the outside, and have remarkable economic benefits.

Description

Technical Field

[0001] The utility model relates to a potassium chloride and sodium chloride salt washing and potassium extraction and purification device, belonging to the technical field of chemical equipment. Background Art

[0002] In the processes of petrochemical industry, coal chemical industry, etc., a large amount of mixed salts containing sodium chloride and potassium chloride are produced or in wastewater treatment. If these mixed salts are not properly disposed of, they will cause great pollution to the environment. However, if the substances in the mixed salts are separated and purified, resource utilization can be realized, which has good social and economic benefits. Content of the Utility Model

[0003] The purpose of the utility model is to provide a potassium chloride and sodium chloride salt washing and potassium extraction and purification device to solve the above technical problems.

[0004] In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

[0005] A potassium chloride and sodium chloride salt washing and potassium extraction and purification device includes a primary dissolution tank, a secondary dissolution tank, a potassium crystallizer, a potassium clear liquid tank, a sodium crystallizer, a sodium centrifuge and a sodium mother liquid tank connected in sequence through pipelines; the liquid outlet of the sodium mother liquid tank is connected to the sodium crystallizer; the sodium crystallizer is also connected to the inlet of a hydrocyclone foam remover; the discharge port of the hydrocyclone foam remover is connected to a heater through a compressor, and the water outlet of the hydrocyclone foam remover is connected to a condensate water tank; the water outlet of the heater is connected to the condensate water tank;

[0006] The potassium crystallizer is also connected to a potassium hydrocyclone, the potassium hydrocyclone is connected to a potassium centrifuge, the potassium centrifuge is connected to a potassium mother liquid tank, and the potassium mother liquid tank is also connected to the potassium crystallizer.

[0007] A further improvement of the technical scheme of the utility model is that a primary dissolution pump is arranged on the pipeline between the primary dissolution tank and the secondary dissolution tank; a secondary dissolution pump is arranged on the pipeline between the secondary dissolution tank and the potassium crystallizer.

[0008] A further improvement of the technical scheme of the utility model is that a potassium crystal slurry pump is arranged on the pipeline between the potassium crystallizer and the potassium hydrocyclone.

[0009] A further improvement of the technical scheme of the utility model is that a potassium clear liquid pump and a heat exchanger are arranged in sequence on the pipeline between the potassium clear liquid tank and the sodium crystallizer; a condensate water pump is arranged at the water outlet of the condensate water tank and is connected to the heat exchanger, and further connected to the primary dissolution tank and the potassium crystallizer.

[0010] A further improvement of the technical scheme of the utility model is that the water outlet of the condensate water tank is also connected to the sodium crystallizer through a pipeline; the sodium crystallizer is also connected to a sodium hydrocyclone through a pipeline, and a sodium crystal slurry pump is arranged on the pipeline.

[0011] A further improvement of the technical solution of the present utility model is that the liquid outlet of the sodium crystallizer is also connected to the first-stage dissolution tank and the external discharge pipeline through a sodium clear liquid pump.

[0012] A further improvement of the technical solution of the present utility model is that the potassium mother liquor tank is connected to the potassium crystallizer through a pipeline, and a potassium mother liquor pump is arranged on the pipeline.

[0013] A further improvement of the technical solution of the present utility model is that the temperatures of the first-stage dissolution tank, the second-stage dissolution tank, the potassium crystallizer, the sodium centrifuge, and the potassium mother liquor tank are 20 - 60 °C, and the operating temperatures of the sodium crystallizer, the sodium centrifuge, and the sodium mother liquor tank are 80 - 120 °C.

[0014] Due to the adoption of the above technical solution, the technical effects achieved by the present utility model are as follows:

[0015] This device is applicable to the separation of mixed salts with high potassium and low sodium. The quality of sodium chloride and potassium chloride can reach the industrial-grade first-class standard or above.

[0016] This device fully realizes the harmless, reduction, and resource utilization of mixed salts, and has good social benefits.

[0017] This device mainly uses condensed water as a solvent to dissolve sodium chloride in the mixed salts, which can reduce the consumption of process water and avoid the treatment of excess aqueous solutions.

[0018] The evaporation part of this device adopts the MVR process, which is advanced in technology and low in energy consumption.

[0019] This device has low comprehensive energy consumption and low operating cost; the potassium chloride and sodium chloride obtained by treating with this device can meet the requirements of industrial applications and can be sold externally, with significant economic benefits. Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of the present utility model;

[0021] Among them, 1. First-stage dissolution tank, 2. Second-stage dissolution tank, 3. Potassium crystallizer, 4. Potassium clear liquid tank, 5. Potassium hydrocyclone, 6. Potassium centrifuge, 7. Potassium mother liquor tank, 8. Condensate tank, 9. Compressor, 10. Cyclone foam eliminator, 11. Heater, 12. Sodium crystallizer, 13. Sodium hydrocyclone, 14. Sodium centrifuge, 15. Sodium mother liquor tank, 16. First-stage dissolution pump, 17. Second-stage dissolution pump, 18. Potassium crystal slurry pump, 19. Potassium clear liquid pump, 20. Potassium mother liquor pump, 21. Condensate pump, 22. Evaporation circulation pump, 23. Sodium mother liquor pump, 24. Sodium clear liquid pump, 25. Sodium crystal slurry pump, 26. Heat exchanger. Detailed Embodiments

[0022] To make the technical means, creative features, achieved purposes and effects realized by the present utility model easy to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0023] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0024] The present utility model is a potassium chloride and sodium chloride salt washing and potassium extraction and purification device, which utilizes the different solubility ratios of sodium chloride and potassium chloride at different temperatures. By converting different evaporation temperatures, the saturated states of the two salts correspond to different temperatures respectively, so as to extract potassium chloride and sodium chloride solids that meet the purity standards respectively.

[0025] As Figure 1 shown, the purification device mainly includes a first-stage dissolution tank 1, a second-stage dissolution tank 2, a potassium crystallizer 3, a potassium clear liquid tank 4, a sodium crystallizer 12, a sodium centrifuge 14 and a sodium mother liquor tank 15 arranged in sequence according to the material flow sequence. The above-mentioned various devices are connected in sequence through pipelines, and the materials are discharged into the next device after being processed in each device. It also includes a potassium purification part, which mainly includes a potassium cyclone 5, a potassium centrifuge 6 and a potassium mother liquor tank 7. The liquid outlet at the lower part of the potassium crystallizer 3 is used to discharge potassium crystal slurry, and this liquid outlet is connected to the potassium cyclone 5 through a pipeline, and there is a potassium crystal slurry pump 18. The potassium cyclone 5 is connected to the potassium centrifuge 6 through a pipeline, and the potassium centrifuge 6 is connected to the potassium mother liquor tank through a pipeline 7. The upper liquid outlet of the potassium cyclone 5 is connected to the potassium crystallizer 3 through a pipeline. Potassium chloride is produced from the potassium centrifuge 6.

[0026] The potassium mother liquor tank 7 is also connected to the potassium crystallizer 3, and the potassium-containing mother liquor is cyclically input into the potassium crystallizer 3 for multiple treatments to improve the potassium recovery rate. Specifically, the potassium mother liquor tank 7 is connected to the potassium crystallizer 3 through a pipeline, and a potassium mother liquor pump 20 is arranged on the pipeline.

[0027] The sodium crystallizer 12, the sodium cyclone 13 and the sodium centrifuge 14 are the sodium purification part. The sodium cyclone 13 is connected to the sodium centrifuge 14 through a pipeline, and the liquid outlet of the sodium centrifuge 14 is connected to the sodium mother liquor tank 15. The product of the sodium centrifuge 14 is sodium chloride. The sodium centrifuge 14 discharges the liquid into the sodium mother liquor tank 15 and enters the sodium purification part again for repeated treatment and purification.

[0028] Further, the liquid outlet of the sodium mother liquor tank 15 is connected to the sodium crystallizer 12. The sodium crystallizer 12 is also connected to the inlet of the hydrocyclone demister 10, and the discharge outlet of the hydrocyclone demister 10 is connected to a compressor 9. The outlet of the compressor 9 is connected with a pipeline, and the outlet of the compressor is connected to the heater 11 through the pipeline. Through the action of the compressor, the secondary steam is heated to a certain temperature. The secondary steam enters the heater 11 and acts as a heating medium. The material liquid first enters the sodium crystallizer 12. After being processed by the sodium crystallizer 12, the water vapor is discharged from the upper part and enters the compressor. In the lower part of the sodium crystallizer 12 is the stratified material, the upper part is the solution still containing sodium, and the lower part is the sodium-containing crystal slurry. Among them, the solution containing sodium is heated by the heater 11 and then enters the sodium crystallizer 12 for further treatment. One of the liquid outlets of the sodium crystallizer 12 is connected to the heater 11 through the evaporation circulation pump 22. The sodium-containing crystal slurry is discharged into the sodium hydrocyclone 13 for further thickening treatment. Further, the sodium crystallizer 12 is also provided with a sodium clear liquid outlet. The sodium clear liquid outlet of the sodium crystallizer 12 is connected to the first-stage dissolution tank 1 and the external discharge pipeline through the sodium clear liquid pump 24. The outlet pipeline of the sodium clear liquid pump 24 has two branches, which are respectively connected to the first-stage dissolution tank 1 and the external discharge pipeline.

[0029] The hydrocyclone demister 10 also has a water outlet and its water outlet is connected to the condensate tank 8. The water outlet of the heater 11 is also connected to the condensate tank 8.

[0030] Each device is connected through pipelines. In order to achieve the efficient flow of liquid materials, corresponding pumps need to be set on the pipelines. Specifically, a first-stage dissolution pump 16 is set on the pipeline between the first-stage dissolution tank 1 and the second-stage dissolution tank 2; a second-stage dissolution pump 17 is set on the pipeline between the second-stage dissolution tank 2 and the potassium crystallizer 3. A potassium crystal slurry pump 18 is set on the pipeline between the potassium crystallizer 3 and the potassium hydrocyclone 5.

[0031] A potassium clear liquid pump 19 and a heat exchanger 26 are successively arranged on the pipeline between the potassium clear liquid tank 4 and the sodium crystallizer 12. The heat exchanger 26 plays a role in heat exchange. Specifically, the water outlet of the condensate tank 8 is provided with a condensate water pump 21 and is connected to the heat exchanger 26. The passage connecting the heat exchanger 26 and the condensate tank 8 is further connected to the first-stage dissolution tank 1 and the potassium crystallizer 3 through pipelines to input clear water into the first-stage dissolution tank 1 and the potassium crystallizer 3. The potassium clear liquid and the condensate water exchange heat in the heat exchanger 26.

[0032] Such as Figure 1As shown, the outlet of the condensate water tank 8 is also connected to the sodium cyclone 13 through a pipeline, and a sodium crystal slurry pump 25 is provided on the pipeline. That is, a condensate water pump 21 is provided at the outlet of the condensate water tank 8, and the outlet of the condensate water pump 21 is divided into two branches. One branch is connected to the heat exchanger 26; the other branch is connected to the sodium crystallizer 12, and further, the crystallizer 12 is connected to the sodium cyclone 13, and a sodium crystal slurry pump 25 is provided on this branch pipeline.

[0033] In addition, for the first-stage dissolution tank 1 and the second-stage dissolution tank 2, cooling water needs to be added, and process water also needs to be added.

[0034] The process treatment of this device is roughly as follows: The mixed salt, hot mother liquor, and condensate water pass through the first-stage dissolution tank 1 and the second-stage dissolution tank 2 in sequence. All sodium chloride is dissolved in the solution, and the solid phase is potassium chloride crystals. The potassium chloride crystal slurry enters the potassium crystallizer 3 through the first-stage dissolution pump 16 and the second-stage dissolution pump 17, then settles and thickens. The crystal slurry is washed in the salt leg at the bottom of the crystallizer and then pumped into the potassium cyclone 5 for further thickening. The clear liquid returns to the potassium crystallizer 3, and the slurry enters the potassium centrifuge 6 for centrifugal separation to obtain solid potassium chloride. The mother liquor enters the potassium mother liquor tank 7 and is then sent back to the potassium crystallizer 3 by the potassium mother liquor pump 23; The clear liquid overflowing from the potassium crystallizer 3 enters the potassium clear liquid tank 4 and is then pumped into the heat exchanger 26 to exchange heat with the condensate water and then enters the MVR evaporator. Sodium chloride crystals are precipitated by evaporation. The sodium chloride crystal slurry is washed in the salt leg at the bottom of the sodium crystallizer 12 and then pumped into the sodium cyclone 13 for further thickening. The clear liquid returns to the sodium crystallizer 12, and the slurry enters the sodium centrifuge 14 for centrifugal separation to obtain solid sodium chloride. The mother liquor enters the sodium mother liquor tank 15 and is then sent back to the sodium crystallizer 12 by the sodium mother liquor pump 23; The clear liquid taken out from the sodium crystallizer 12 returns to the first-stage dissolution tank 1 to dissolve the mixed salt. Since impurities in the system continuously accumulate, when the impurity content in the mother liquor reaches a certain level, it needs to be discharged for treatment to ensure the purity of sodium chloride and potassium chloride products.

[0035] Part of the condensate water produced by the cyclone demister 10 and the heat exchanger 26 is used to wash sodium chloride and potassium chloride, and part is used to dissolve the mixed salt.

[0036] The temperature of the dissolution tank, potassium crystallizer, sodium centrifuge, and potassium mother liquor tank is 20 - 60 °C, and the operating temperature of the sodium crystallizer, sodium centrifuge, and sodium mother liquor tank is 80 - 120 °C.

[0037] When this device is in use, for the part where sodium chloride is evaporated, an MVR evaporator can be used, or a multi-effect evaporator can also be used. The sodium clear liquid can be cooled by vacuum flashing or by indirect heat exchange.

[0038] This device is suitable for separating mixed salts with high potassium and low sodium. This device has low comprehensive energy consumption and low operating cost; the potassium chloride and sodium chloride obtained by processing this device can meet the requirements of industrial applications and can be sold externally, having significant economic benefits.

[0039] The foregoing has shown and described the basic principles, main features and advantages of the present utility model. Those skilled in the art should understand that the present utility model is not limited by the above embodiments, and what is described in the above embodiments and the specification is only to illustrate the principle of the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will also have various changes and improvements, and all these changes and improvements fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A potassium chloride and sodium chloride salt washing and potassium extraction and purification device, characterized in that: It includes a primary dissolution tank (1), a secondary dissolution tank (2), a potassium crystallizer (3), a potassium clear liquid tank (4), a sodium crystallizer (12), a sodium centrifuge (14), and a sodium mother liquor tank (15) that are connected in sequence through pipelines; the liquid outlet of the sodium mother liquor tank (15) is connected to the sodium crystallizer (12); the sodium crystallizer (12) is also connected to the inlet of a hydrocyclone dephlegmator (10); the discharge port of the hydrocyclone dephlegmator (10) is connected to a heater (11) through a compressor (9), and the water outlet of the hydrocyclone dephlegmator (10) is connected to a condensate water tank (8); the water outlet of the heater (11) is connected to the condensate water tank (8). The potassium crystallizer (3) is also connected to a potassium hydrocyclone (5), the potassium hydrocyclone (5) is connected to a potassium centrifuge (6), the potassium centrifuge (6) is connected to a potassium mother liquor tank (7), and the potassium mother liquor tank (7) is also connected to the potassium crystallizer (3).

2. The potassium chloride and sodium chloride salt washing and potassium extraction and purification device according to claim 1, characterized in that: A primary dissolution pump (16) is provided on the pipeline between the primary dissolution tank (1) and the secondary dissolution tank (2); a secondary dissolution pump (17) is provided on the pipeline between the secondary dissolution tank (2) and the potassium crystallizer (3).

3. A potassium chloride and sodium chloride salt washing and potassium extraction and purification device according to claim 1, characterized in that: A potassium crystal slurry pump (18) is provided on the pipeline between the potassium crystallizer (3) and the potassium hydrocyclone (5).

4. The potassium chloride and sodium chloride salt washing and potassium extraction and purification device according to claim 1, characterized in that: A potassium clear liquid pump (19) and a heat exchanger (26) are provided in sequence on the pipeline between the potassium clear liquid tank (4) and the sodium crystallizer (12); a condensate water pump (21) is provided at the water outlet of the condensate water tank (8) and is connected to the heat exchanger (26), and further connected to the primary dissolution tank (1) and the potassium crystallizer (3).

5. A potassium chloride and sodium chloride salt washing and potassium extraction and purification device according to claim 1, characterized in that: The water outlet of the condensate water tank (8) is also connected to the sodium crystallizer (12) through a pipeline; the sodium crystallizer (12) is also connected to a sodium hydrocyclone (13) through a pipeline, and a sodium crystal slurry pump (25) is provided on the pipeline.

6. The potassium chloride and sodium chloride salt washing and potassium extraction and purification device according to claim 1, characterized in that: The liquid outlet of the sodium crystallizer (12) is also connected to the primary dissolution tank (1) and the external discharge pipeline through a sodium clear liquid pump (24).

7. A potassium chloride and sodium chloride salt washing and potassium extraction and purification device according to claim 1, characterized in that: The potassium mother liquor tank (7) is connected to the potassium crystallizer (3) through a pipeline, and a potassium mother liquor pump (20) is provided on the pipeline.

8. A potassium chloride and sodium chloride salt washing and potassium extraction and purification device according to any one of claims 1-7, characterized in that: The temperatures of the primary dissolution tank (1), the secondary dissolution tank (2), the potassium crystallizer (3), the sodium centrifuge (14), and the potassium mother liquor tank (7) are 20 - 60 °C, and the operating temperatures of the sodium crystallizer (12), the sodium centrifuge (14), and the sodium mother liquor tank (15) are 80 - 120 °C.

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