Salt-free device for discharging clear liquid of evaporative crystallization mother liquor

Abstract

The utility model discloses an evaporative crystallization mother liquor clear liquid discharge salt-free device, which comprises a thickener tank, a mother liquor tank and a clear liquid tank, the thickener tank is arranged above the clear liquid tank, and a first overflow pipe and a second overflow pipe are arranged in the thickener tank. The thickener tank is communicated with the mother liquid tank and the clear liquid tank through a first overflow pipe and a second overflow pipe; a liquid outlet pipe is arranged at the bottom of the thickener tank, a centrifugal machine is connected to the bottom of the liquid outlet pipe, and a mother liquid pipe is arranged at the bottom of the centrifugal machine; after being treated by the device, the clear liquid in the clear liquid tank is free of salt discharge, so that the treatment pressure of a rear-end system and the salt dissolving cost of the concentration storage tank are greatly reduced, the problem that 28% of fine salt in centrifugal mother liquor is entrained and settled in the mother liquor tank is solved, the system is returned again for crystallization, and the treatment efficiency of the concentrated mother liquor is improved; the potassium and sodium salts in the centrifugal mother liquor can be effectively separated, the recovery rate and purity of the potassium and sodium salts are improved, and discharge and treatment of tank area salt entrainment are reduced.

Description

Technical Field

[0001] The utility model relates to the field of lithium sulfate production, in particular to a salt-free device for discharging the clear liquid of evaporation crystallization mother liquor. Background Art

[0002] Lithium sulfate, also known as lithium glutamate, is a colorless monoclinic crystal or white crystalline powder that is soluble in water but insoluble in acetone and anhydrous ethanol. Its water solubility at 25 degrees Celsius is 25.7%. It has three crystal forms: α, β, and γ. The α form is a white monoclinic crystal, the β form is a hexagonal crystal, and the γ form is a cubic crystal. It is hygroscopic. Lithium sulfate monohydrate crystallized from a concentrated aqueous solution is very stable and has therapeutic effects on manic-depressive psychosis.

[0003] In the existing technology, a certain amount of liquid is discharged during the production of lithium sulfate. The salt content in this liquid is relatively high, and the mother liquor after treatment and separation contains a large amount of salt (about 28%) which will precipitate, affecting the circulation operation and thus the continued use of the device. Therefore, it is necessary to design a salt-free device for discharging the clear liquid of the evaporation crystallization mother liquor. Utility Model Content

[0004] In response to the problems in the related art, the utility model proposes a salt-free device for discharging the clear liquid of the evaporation crystallization mother liquor to overcome the above-mentioned technical problems existing in the existing related technology.

[0005] To this end, the specific technical solutions adopted in this utility model are as follows:

[0006] A device for discharging a salt-free clear liquid from an evaporation crystallization mother liquor comprises a thickener tank, a mother liquor tank, and a clear liquid tank. The thickener tank is disposed above the clear liquid tank, and a first overflow pipe and a second overflow pipe are disposed within the thickener tank. The thickener tank is connected to the mother liquor tank and the clear liquid tank via the first overflow pipe and the second overflow pipe. The arrangement of the clear liquid tank and the second overflow pipe ensures that the clear liquid is discharged normally and without salt during use by extracting the clear liquid from the thickener tank after standing.

[0007] A liquid outlet pipe is provided at the bottom of the thickener tank, the bottom of the liquid outlet pipe is connected to a centrifuge, and a mother liquor pipe is provided at the bottom of the centrifuge. The mother liquor in the centrifuge is passed into the mother liquor tank through the mother liquor pipe at the bottom of the centrifuge;

[0008] The upper ends of the mother liquid tank and the clear liquid tank are both provided with a stirring motor, the output shaft of the stirring motor is connected to a stirring shaft, the stirring shaft is provided with stirring blades, and an inclined plate is provided at the bottom of each of the mother liquid tank and the clear liquid tank; by arranging the stirring motor, the stirring shaft and the stirring blades in the mother liquid tank, the problem of 28% of the fine salt in the centrifuged mother liquor being entrained and settled in the mother liquid tank is solved, and the crystallized salt particles are continuously accumulated. When stirring is turned on, the crystallized salt slurry is transported to the evaporator through the mother liquid tank discharge pipe at the lower discharge port at the bottom of the mother liquid tank and even returned to the evaporation system for crystallization, thereby improving the processing efficiency of concentrated mother liquor and salt; the use of the clear liquid tank and stirring-assisted structure can greatly reduce the discharge of fine salt in the qualified liquid tank area, shorten the processing time, and reduce the evaporation energy consumption.

[0009] Preferably, a mother liquid tank drain pipe is provided at the bottom of the mother liquid tank, and a qualified liquid drain pipe is provided at the bottom of the clear liquid tank.

[0010] Preferably, the thickener tank is provided with an overflow port, and the overflow port of the mother liquid tank is located on the side direction of the overflow of the clear liquid tank. The overflow port of the thickener tank is set to at least two groups, and the two groups of overflow ports are respectively arranged on the left and right sides of the upper end cover of the thickener tank. The two groups of overflow ports are arranged with the pipeline as the center point, and the overflow port of the clear liquid tank is arranged lower than the overflow port of the mother liquid tank; by adopting the setting of the clear liquid tank and the second overflow pipe, the clear liquid can be conveniently collected and discharged, avoiding interference with the mother liquid tank, and improving the salt processing efficiency.

[0011] Preferably, valves are provided on the mother liquid tank discharge pipe of the mother liquid tank and the qualified liquid discharge pipe in the clear liquid tank; by adopting the setting of multiple groups of liquid inlet pipes and valves, the discharge of the mother liquid tank and the clear liquid tank can be conveniently switched and controlled, thereby avoiding pipeline blockage and improving the treatment effect and safety of the centrifuged mother liquid and the clear liquid tank.

[0012] Preferably, the top of the thickener tank is connected to a thickener liquid inlet pipe, and the input end of the thickener liquid inlet pipe is connected to a crystallizer.

[0013] Preferably, two evaporators are provided at the bottom of the crystallizer, the inner walls of the evaporators are connected to raw material pipes, and the bottoms of the evaporators are connected to a forced circulation pump.

[0014] Preferably, the outer wall of the crystallizer is provided with a first gas phase pipe, and one end of the first gas phase pipe is connected to a compressor.

[0015] Preferably, the outer wall of the compressor is connected to a second gas phase pipe, and one end of the second gas phase pipe is connected to the evaporator.

[0016] The beneficial effects of the utility model are as follows: 1. The evaporation crystallization mother liquor clear liquid discharge salt-free device, after being processed by the device, the clear liquid in the clear liquid tank is discharged without salt, which greatly reduces the processing pressure of the back-end system and the cost of dissolving salt in the concentrated storage tank, and also solves the problem of 28% of the fine salt in the centrifugal mother liquor being entrained and settled in the mother liquor tank, and returns the salt to the system for crystallization, thereby improving the processing efficiency of the concentrated mother liquor; it can effectively separate the potassium and sodium salts in the centrifugal mother liquor, improve the recovery rate and purity of the potassium and sodium salts, and reduce the discharge and treatment of salt entrainment in the tank area.

[0017] The salt-free device for discharging the clear liquid of the evaporation crystallization mother liquor can conveniently collect and discharge the clear liquid by adopting the arrangement of the clear liquid tank and the second overflow pipe, thereby avoiding interference with the mother liquor tank and improving the salt treatment efficiency.

[0018] The salt-free device for discharging the evaporation crystallization mother liquor and the clear liquid can conveniently switch and control the discharge of the mother liquor tank and the clear liquid tank by adopting the arrangement of multiple groups of liquid inlet pipes and valves, thereby avoiding pipeline blockage and improving the treatment effect and safety of the centrifugal mother liquor and the clear liquid tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is the main view of the utility model;

[0021] Figure 2 This is a schematic diagram of the connection structure of the thickener tank, centrifuge, clear liquid tank and mother liquid tank of the utility model;

[0022] Figure 3 This is a schematic diagram of the internal structure of the gas phase pipe and mother liquid tank of the utility model;

[0023] Figure 4 This is a schematic diagram of the connection structure of the crystallizer, compressor, forced circulation pump and evaporator of the utility model.

[0024] In the figure: 1. Clear liquid tank; 2. Mother liquid tank; 3. Stirring motor; 4. Stirring shaft; 5. Stirring blade; 6. Inclined plate; 7. Mother liquid pipe; 8. First overflow pipe; 9. Second overflow pipe; 10. Liquid outlet pipe; 11. Centrifuge; 12. Thickener tank; 13. Thickener inlet pipe; 14. Qualified liquid discharge pipe; 15. Mother liquid tank discharge pipe; 16. Evaporator; 17. Forced circulation pump; 18. Crystallizer; 19. Compressor; 20. First gas phase pipe; 21. Second gas phase pipe; 22. Raw material pipe. DETAILED DESCRIPTION

[0025] To further illustrate each embodiment, the present invention provides drawings, which are part of the disclosure of the present invention and are mainly used to illustrate the embodiments. They can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. By referring to these contents, ordinary technicians in this field should be able to understand other possible implementation methods and the advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0026] According to an embodiment of the utility model, a salt-free device for discharging the clear liquid of evaporation crystallization mother liquor is provided.

[0027] Embodiment 1;

[0028] like Figures 1-4 As shown, the salt-free device for discharging the mother liquor of evaporation and crystallization according to an embodiment of the present invention includes a thickener tank 12, a mother liquor tank 2 and a clear liquid tank 1. The thickener tank 12 is arranged above the clear liquid tank 1. A first overflow pipe 8 and a second overflow pipe 9 are provided inside the thickener tank 12. The thickener tank 12 is connected to the mother liquor tank 2 and the clear liquid tank 1 through the first overflow pipe 8 and the second overflow pipe 9.

[0029] A liquid outlet pipe 10 is provided at the bottom of the thickener tank 12, and a centrifuge 11 is connected to the bottom of the liquid outlet pipe 10. A mother liquor pipe 7 is provided at the bottom of the centrifuge 11. The mother liquor in the centrifuge 11 is passed into the mother liquor tank 2 through the mother liquor pipe 7 at the bottom of the centrifuge 11.

[0030] The upper ends of the mother liquid tank 2 and the clear liquid tank 1 are both provided with a stirring motor 3, the output shaft of the stirring motor 3 is connected to a stirring shaft 4, and the stirring shaft 4 is provided with a stirring blade 5. The bottom ends of the mother liquid tank 2 and the clear liquid tank 1 are each provided with an inclined plate 6.

[0031] A mother liquid tank drain pipe 15 is provided at the bottom of the mother liquid tank 2 , and a qualified liquid drain pipe 14 is provided at the bottom of the clear liquid tank 1 .

[0032] The thickener tank 12 is provided with an overflow port, and the overflow port of the mother liquid tank 2 is located on the side of the overflow of the clear liquid tank 1. The overflow port of the thickener tank 12 is set to at least two groups, and the two groups of overflow ports are respectively arranged on the left and right sides of the upper end cover of the thickener tank 12. The two groups of overflow ports are arranged with the pipeline as the center point, and the overflow port of the clear liquid tank 1 is set lower than the overflow port of the mother liquid tank 2.

[0033] Valves are provided on the mother liquid tank discharge pipe 15 of the mother liquid tank 2 and the qualified liquid discharge pipe 14 in the clear liquid tank 1.

[0034] The top of the thickener tank 12 is connected to a thickener liquid inlet pipe 13 , and the input end of the thickener liquid inlet pipe 13 is connected to a crystallizer 18 .

[0035] Two evaporators 16 are provided at the bottom of the crystallizer 18 . The inner wall of the evaporator 16 is connected to a raw material pipe 22 , and the bottom of the evaporator 16 is connected to a forced circulation pump 17 .

[0036] A first gas phase pipe 20 is provided on the outer wall of the crystallizer 18 , and one end of the first gas phase pipe 20 is connected to a compressor 19 .

[0037] A second gas-phase pipe 21 is connected to an outer wall of the compressor 19 , and one end of the second gas-phase pipe 21 is connected to the evaporator 16 .

[0038] In this embodiment, by providing the clear liquid tank 1 and the second overflow pipe 9, during use, it is possible to extract the clear liquid after standing in the thickener tank 12, thereby ensuring normal discharge of the clear liquid without salt.

[0039] In this embodiment, the setting of the stirring motor 3, stirring shaft 4 and stirring blades 5 in the mother liquor tank 2 solves the problem of 28% of the fine salt in the centrifuged mother liquor being entrained and settled in the mother liquor tank, and the crystallized salt particles are continuously accumulated. The stirring is turned on to transport the crystallized salt slurry through the mother liquor tank discharge pipe 15 at the bottom of the mother liquor tank 2 to the evaporator 16 and even the evaporation system to return to the crystallization, thereby improving the processing efficiency of the concentrated mother liquor and salt; the use of the clear liquid tank 1 and the stirring-assisted structure can greatly reduce the discharge of fine salt in the qualified liquid tank area, shorten the processing time, and reduce the evaporation energy consumption.

[0040] In this embodiment, by adopting the arrangement of the clear liquid tank 1 and the second overflow pipe 9, the clear liquid can be conveniently collected and discharged, thus avoiding interference with the mother liquid tank 2 and improving the salt treatment efficiency.

[0041] In this embodiment, by adopting the arrangement of multiple groups of liquid inlet pipes and valves, the discharge of the mother liquid tank 2 and the clear liquid tank 1 can be conveniently switched and controlled, thus avoiding pipe blockage and improving the treatment effect and safety of the centrifuged mother liquid and the clear liquid tank.

[0042] In order to facilitate understanding of the above technical solutions of the present invention, the working principle or operation method of the present invention in actual process is described in detail below.

[0043] In actual application, first, the raw liquid connected to the raw material pipe 22 is evaporated and crystallized through the coordinated use of the evaporator 16, the crystallizer 18 and the compressor 19, and the obtained liquid is discharged into the thickener tank 12 through the thickener inlet pipe 13 and allowed to stand and stratify in the thickener tank 12. The clear liquid is discharged into the clear liquid tank 1 through the second overflow pipe 9 and stored in the clear liquid tank 1. Finally, the mother liquor in the thickener tank 12 enters the centrifuge 11 for centrifugation through the qualified liquid discharge pipe 14, and the mother liquor pipe 7 is passed into the mother liquor tank 2. The stirring motor 3 is turned on to drive the stirring shaft 4 and the stirring blade 5 to rotate and stir, which solves the problem of 28% of the fine salt in the centrifuged mother liquor being entrained and settled in the mother liquor tank. The mother liquor tank discharge pipe 15 at the bottom of the mother liquor tank 2 is transported to the evaporator 16 and even the evaporation system to return to crystallization, thereby improving the processing efficiency of concentrated mother liquor and salt.

[0044] In summary, with the aid of the above-mentioned technical solution of the present invention, the evaporation crystallization mother liquor clear liquid discharge salt-free device, after being processed by the device, the clear liquid in the clear liquid tank is discharged without salt, which greatly reduces the processing pressure of the back-end system and the cost of dissolving salt in the concentrated storage tank, and also solves the problem of 28% of the fine salt of the centrifugal mother liquor being entrained and settled in the mother liquor tank, and returns to the system for crystallization, thereby improving the processing efficiency of the concentrated mother liquor; the potassium and sodium salts in the centrifugal mother liquor can be effectively separated, the recovery rate and purity of the potassium and sodium salts are improved, and the discharge and treatment of salt entrainment in the tank area are reduced; by adopting the arrangement of the clear liquid tank 1 and the second overflow pipe 9, the clear liquid can be conveniently collected and discharged, avoiding interference with the mother liquor tank 2, and improving the salt processing efficiency; by adopting the arrangement of multiple groups of liquid inlet pipes and valves, the discharge of the mother liquor tank 2 and the clear liquid tank 1 can be conveniently switched and controlled, avoiding pipeline blockage, and improving the processing effect and safety of the centrifugal mother liquor and the clear liquid tank.

[0045] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A salt-free device for evaporating crystallization mother liquor and clear liquid, comprising a thickener tank (12), a mother liquor tank (2) and a clear liquid tank (1), characterized in that: The thickener tank (12) is arranged above the clear liquid tank (1), and a first overflow pipe (8) and a second overflow pipe (9) are provided inside the thickener tank (12). The thickener tank (12) is connected to the mother liquid tank (2) and the clear liquid tank (1) through the first overflow pipe (8) and the second overflow pipe (9); A liquid outlet pipe (10) is provided at the bottom of the thickener tank (12), the bottom of the liquid outlet pipe (10) is connected to a centrifuge (11), a mother liquor pipe (7) is provided at the bottom of the centrifuge (11), and the mother liquor in the centrifuge (11) is passed into the mother liquor tank (2) through the mother liquor pipe (7) at the bottom of the centrifuge (11); A stirring motor (3) is provided at the upper end of each of the mother liquid tank (2) and the clear liquid tank (1); a stirring shaft (4) is connected to the output shaft of the stirring motor (3); a stirring blade (5) is provided on the stirring shaft (4); and an inclined plate (6) is provided at the bottom end of each of the mother liquid tank (2) and the clear liquid tank (1).

2. The salt-free device for discharging the supernatant of evaporative crystallization mother liquor according to claim 1, characterized in that: A mother liquid tank drain pipe (15) is provided at the bottom of the mother liquid tank (2), and a qualified liquid drain pipe (14) is provided at the bottom of the clear liquid tank (1).

3. The salt-free device for discharging the supernatant of evaporative crystallization mother liquor according to claim 1, characterized in that: The thickener tank (12) is provided with an overflow port, and the overflow port of the mother liquid tank (2) is located on the side of the overflow of the clear liquid tank (1). The overflow port of the thickener tank (12) is provided in at least two groups, and the two groups of overflow ports are respectively provided on the left and right sides of the upper end cover of the thickener tank (12). The two groups of overflow ports are provided with the pipeline as the center point, and the overflow port of the clear liquid tank (1) is provided lower than the overflow port of the mother liquid tank (2).

4. The salt-free device for discharging the supernatant of evaporative crystallization mother liquor according to claim 2, characterized in that: Valves are provided on the mother liquid tank discharge pipe (15) of the mother liquid tank (2) and the qualified liquid discharge pipe (14) in the clear liquid tank (1).

5. The salt-free device for discharging the supernatant of evaporative crystallization mother liquor according to claim 1, characterized in that: The top end of the thickener tank (12) is connected to a thickener liquid inlet pipe (13), and the input end of the thickener liquid inlet pipe (13) is connected to a crystallizer (18).

6. The salt-free device for discharging the supernatant of evaporation crystallization mother liquor according to claim 5, characterized in that: Two evaporators (16) are provided at the bottom of the crystallizer (18), the inner walls of the evaporators (16) are connected to raw material pipes (22), and the bottoms of the evaporators (16) are connected to forced circulation pumps (17).

7. The salt-free device for discharging the supernatant of evaporative crystallization mother liquor according to claim 6, characterized in that: A first gas phase pipe (20) is provided on the outer wall of the crystallizer (18), and one end of the first gas phase pipe (20) is connected to a compressor (19).

8. The salt-free device for discharging the supernatant of evaporation crystallization mother liquor according to claim 7, characterized in that: The outer wall of the compressor (19) is connected to a second gas phase pipe (21), and one end of the second gas phase pipe (21) is connected to the evaporator (16).

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