Recycling system for lithium precipitation mother liquor of lithium carbonate

Abstract

The utility model discloses a lithium carbonate lithium precipitation mother liquor recycling system which is characterized in that a lithium precipitation mother liquor pipeline is connected with a tube pass outlet of a freezing heat exchanger and a carbonization freezing crystallizer, and a circulating outlet of the carbonization freezing crystallizer is connected with a tube pass inlet of the freezing heat exchanger; a bottom crystal mush outlet is connected with the freezing thickening tank, a thickening bottom outlet is connected with the double-push centrifugal machine, and a solid phase outlet of the double-push centrifugal machine is connected with a salt outlet pipeline of the double-push centrifugal machine; the liquid phase outlet is connected with a freezing mother liquor tank; an outlet of the freezing mother liquor tank is connected with the pyrolysis crystallizer, a circulating outlet of the pyrolysis crystallizer is connected with a tube pass inlet of the forced evaporator, and a tube pass outlet of the forced evaporator is connected with a circulating inlet of the pyrolysis crystallizer; a bottom salt leg outlet of the pyrolysis crystallizer is connected with a scraper centrifuge; a solid phase outlet of the scraper centrifuge is connected with a salt outlet pipeline of the scraper centrifuge; a mother liquor outlet of the scraper centrifuge is connected with an inlet of the evaporation mother liquor tank. The system is good in safety, and the equipment and land occupation cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a lithium precipitation mother liquor recovery system, especially to a lithium carbonate lithium precipitation mother liquor recycling system, belongs to the waste recycling technical field. BACKGROUND

[0002] Based on the rapid development of new energy electric vehicles and lithium ion intelligent equipment industry in recent years, the global demand for lithium resources is growing explosively, and the demand for lithium carbonate, an indispensable important raw material for lithium ion batteries, is also rising. The process of lithium carbonate production line mainly includes: raw material preparation, conversion roasting, fine grinding and separation, acidification roasting, leaching and pulp making, filtration, washing, purification, filtration, evaporation and concentration, lithium precipitation, carbonization pyrolysis purification, separation, drying, crushing and packaging. The lithium precipitation mother liquor produced in the lithium precipitation process still contains 2~3g / L lithium ions, and if it is directly discharged, it will cause problems such as waste of lithium resources, high economic loss and environmental pollution.

[0003] In the face of this problem, the conventional treatment method adopted by the lithium carbonate production industry is to first use sulfuric acid to acidify the lithium precipitation mother liquor to remove carbonate ions, then use caustic soda for neutralization, then evaporate and concentrate to crystallize sodium, flash evaporation and freeze to remove nitrate, and finally add sodium carbonate to precipitate lithium to obtain lithium carbonate solid. Repeat this step to achieve the purpose of recycling the mother liquor to prepare battery-grade lithium carbonate. Not only does it occupy a large area and require high equipment investment, but it also leads to high energy consumption, high labor costs and high production costs, which seriously restricts the development of enterprises. Therefore, a continuous operation device with low cost and high lithium recovery rate is urgently needed to achieve the development goal of reducing costs and increasing efficiency and improving competitiveness in the industry.

[0004] Chinese patent with application number 201110122564.9 discloses a treatment method for battery-grade lithium carbonate mother liquor, including the following process flow: A. Lithium precipitation mother liquor acidification; B. Evaporation and concentration and sodium precipitation; C. Lithium precipitation; D. Circulation: the liquid obtained by B step and C step elution is recycled with the lithium precipitation mother liquor to perform the above A~C steps. This technical solution has the following defects: 1. The process is complicated and not simple and convenient; 2. High-purity strong acid and strong base are added for acidification and neutralization, which has operation risks; 3. The equipment investment cost is high, and the equipment occupies a large area; 4. The operation energy consumption and raw material cost of sulfuric acid and caustic soda are high. SUMMARY

[0005] This section aims to outline some aspects of the embodiments of the present utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the utility model name, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0006] In view of the above and / or problems existing in the prior art, the utility model provides a lithium carbonate lithium precipitation mother liquor recycling system.

[0007] The utility model discloses a lithium carbonate lithium precipitation mother liquor recycling system, which can improve the safety of the recovered lithium precipitation mother liquor, reduce equipment investment and land cost, and reduce operation energy consumption and raw material cost.

[0008] To solve the above technical problems, the lithium carbonate lithium precipitation mother liquor recycling system comprises a carbonization freezing crystallizer, an outlet of a lithium precipitation mother liquor pipeline is connected with a tube pass outlet of a freezing heat exchanger, and the freezing heat exchanger is connected with an inlet of the carbonization freezing crystallizer; a carbon dioxide inlet of the carbonization freezing crystallizer is connected with a carbon dioxide pipeline; a circulating outlet of an upper side wall of the carbonization freezing crystallizer is connected with a tube pass inlet of the freezing heat exchanger through a feed liquid circulating pump;

[0009] A bottom crystal slurry outlet of the carbonization freezing crystallizer is connected with an inlet of a freezing thick tank through a freezing discharge pump; a bottom outlet of the freezing thick tank is connected with an inlet of a double-push centrifuge; a solid phase outlet of the double-push centrifuge is connected with a double-push centrifuge salt outlet pipeline; and a liquid phase outlet of the double-push centrifuge is connected with an inlet of a freezing mother liquor tank.

[0010] An outlet of the freezing mother liquor tank is connected with an inlet of a pyrogenic crystallizer through a freezing mother liquor pump; a side wall circulating outlet of a bottom cone of the pyrogenic crystallizer is connected with a tube pass inlet of a forced evaporator; a tube pass outlet of the forced evaporator is connected with a circulating inlet of the pyrogenic crystallizer through a forced circulating pump.

[0011] A bottom salt leg outlet of the pyrogenic crystallizer is connected with an inlet of a scraper centrifuge through an evaporation discharge pump; a solid phase outlet of the scraper centrifuge is connected with a scraper centrifuge salt outlet pipeline; and a mother liquor outlet of the scraper centrifuge is connected with an inlet of an evaporation mother liquor tank.

[0012] As an improvement of the utility model, an outlet of the evaporation mother liquor tank is connected with an inlet of an evaporation mother liquor pump; an outlet one of the evaporation mother liquor pump is connected with the evaporation circulating pipeline through a reflux pipeline; and an outlet two of the evaporation mother liquor pump is connected with the lithium precipitation mother liquor pipeline through an evaporation mother liquor discharge pipeline.

[0013] As a further improvement of the utility model, an outlet of a steam pipeline is connected with a shell pass inlet of the forced evaporator; and a shell pass outlet of the forced evaporator is connected with an inlet of a condensate tank.

[0014] As a further improvement of the utility model, the top secondary steam outlet of the pyrolysis crystallizer is connected with the shell side inlet of the condenser, the tube side of the condenser is connected with a circulating cooling water pipeline, and the shell side condensate water outlet of the condenser is connected with the inlet of the condensate water tank.

[0015] As a further improvement of the utility model, the shell side outlet of the refrigeration heat exchanger is connected with the inlet of a refrigerant circulating pump, and the outlet of the refrigerant circulating pump is connected with the shell side inlet of the refrigeration heat exchanger through a refrigerant circulating pipeline.

[0016] Compared with the prior art, the application has at least the following advantages or beneficial effects: 1. The system uses a decarburization refrigeration and pyrolysis evaporation system to replace the original complex process, reduces the equipment floor area, reduces the initial investment, improves the operation efficiency and stability of the entire production system, and reduces the operation cost. Only carbon dioxide gas is introduced into the carbonization refrigeration section, which is non-toxic and odorless, greatly improving the safety of the recovered lithium sink solution; the equipment and floor investment cost are greatly reduced; the operation energy consumption and raw material cost are greatly reduced, greatly improving the competitiveness of lithium carbonate production enterprises.

[0017] 2. The carbonization refrigeration reduces the solution temperature, reduces the solubility of sodium sulfate in the solution, removes the impurities in the lithium sink solution, avoids the simultaneous precipitation of sodium sulfate and lithium carbonate in the pyrolysis evaporation section, and greatly improves the purity of the recovered lithium carbonate. The carbonization refrigeration reacts lithium carbonate and carbon dioxide to generate lithium bicarbonate, avoids the lithium ions from escaping the system together with the mirabilite, eliminates unnecessary waste, greatly improves the lithium recovery rate, and reduces the production cost; at the same time, the lithium sulfate in the solid sodium sulfate salt is reduced, and the purity of the sodium sulfate is improved.

[0018] 3. The carbonization and refrigeration are combined into one system, and the carbonization is carried out during the refrigeration. The reaction of carbon dioxide and lithium carbonate is an exothermic reaction, which needs to be carried out in a low-temperature environment. The system provides a low-temperature reaction condition for the carbonization reaction while reducing the sodium precipitation. The system investment is reduced, the process flow is shortened, the personnel operation cost and system maintenance cost are reduced, and the system working efficiency and operation stability are greatly improved.

[0019] 4. After the lithium carbonate decomposed by the pyrolysis evaporation process is evaporated and concentrated, a large amount of lithium carbonate is precipitated, and battery-grade lithium carbonate is produced by centrifugal separation. The material enters the centrifuge from the pyrolysis evaporation system, and the material is in a high-temperature state. The solubility of lithium carbonate decreases with the increase of temperature, and the solubility of sodium sulfate increases with the increase of temperature. Therefore, in a high-temperature state, lithium carbonate is almost insoluble in water, and a large amount of lithium carbonate is precipitated, while sodium sulfate has high solubility and will not precipitate. This method greatly improves the recovery rate and purity of lithium carbonate.

[0020] 5. The present application combines pyrolysis and evaporation into a system, and pyrolysis is carried out in the process of evaporation, and lithium bicarbonate is completely decomposed into lithium carbonate and carbon dioxide, and the pyrolysis reaction needs to be carried out under heating conditions, and the method adopted by the present application provides heating reaction conditions for the pyrolysis reaction while evaporating and concentrating, reduces system equipment investment, shortens process flow, reduces personnel operation cost and system maintenance cost, greatly improves system working efficiency and operation stability. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the following embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained from these drawings without creative labor, and the drawings are only for reference and illustration, not to limit the present application. Among them:

[0022] Figure 1 Process flow diagram of the lithium carbonate lithium precipitation mother liquor recycling system of the present application;

[0023] In the figure: 1. Carbonization freezing crystallizer; 2. Freezing heat exchanger; 3. Freezing thick tank; 4. Double push centrifuge; 5. Freezing mother liquor tank; 6. Pyrolysis crystallizer; 7. Forced evaporator; 8. Scraper centrifuge; 9. Evaporation mother liquor tank; 10. Condenser; 11. Condensed water tank;

[0024] G1. Lithium precipitation mother liquor pipeline; G2. Carbonization freezing circulation pipeline; G3. Refrigerant circulation pipeline; G4. Carbon dioxide pipeline; G5. Freezing crystal slurry discharge pipeline; G6. Freezing thick tank overflow pipeline; G7. Double push centrifuge salt discharge pipeline; G8. Freezing centrifugal mother liquor pipeline; G9. Freezing mother liquor discharge pipeline; G10. Evaporation circulation pipeline; G11. Evaporation crystal slurry discharge pipeline; G12. Scraper centrifuge salt discharge pipeline; G13. Evaporation centrifugal mother liquor pipeline; G14. Evaporation mother liquor discharge pipeline; G15. Steam pipeline;

[0025] B1. Feed liquid circulation pump; B2. Refrigerant circulation pump; B3. Freezing discharge pump; B4. Freezing mother liquor pump; B5. Forced circulation pump; B6. Evaporation discharge pump; B7. Evaporation mother liquor pump; B8. Condensed water pump. DETAILED DESCRIPTION

[0026] In the following description of the present application, the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not mean that the device must have a particular orientation.

[0027] In order to make the technical means, creation characteristics, purposes and effects of the utility model easy to understand, the utility model is further described below in combination with specific drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the utility model belongs. The terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model.

[0029] As shown in Figure 1 The lithium carbonate lithium precipitation mother liquor recycling system of the utility model includes carbonization refrigeration crystallizer 1, refrigeration heat exchanger 2, refrigeration thick tank 3, double-push centrifuge 4, refrigeration mother liquor tank 5, pyrogenation crystallizer 6, forced evaporator 7, scraper centrifuge 8, evaporation mother liquor tank 9, condenser 10 and condensed water tank 11.

[0030] The outlet of lithium precipitation mother liquor pipeline G1 is connected with the outlet pipeline of the tube side of refrigeration heat exchanger 2 after merging, and the outlet of carbon dioxide pipeline G4 is connected with the carbon dioxide inlet of carbonization refrigeration crystallizer 1; the overflow port of the upper part of the side wall of carbonization refrigeration crystallizer 1 is connected with the inlet of feed liquid circulating pump B1 through carbonization refrigeration circulating pipeline G2, and the outlet of feed liquid circulating pump B1 is connected with the tube side inlet of refrigeration heat exchanger 2; the shell side outlet of refrigeration heat exchanger 2 is connected with the inlet of refrigerant circulating pump B2, and the outlet of refrigerant circulating pump B2 is connected with the shell side inlet of refrigeration heat exchanger 2 through refrigerant circulating pipeline G3.

[0031] The bottom crystal slurry outlet of carbonization refrigeration crystallizer 1 is connected with the inlet of refrigeration discharge pump B3, the outlet of refrigeration discharge pump B3 is connected with the feed inlet of refrigeration thick tank 3 through refrigeration crystal slurry discharge pipeline G5, the bottom outlet of refrigeration thick tank 3 is connected with the inlet of double-push centrifuge 4, and the solid phase outlet of double-push centrifuge 4 is connected with double-push centrifuge salt outlet pipeline G7. The liquid phase outlet of double-push centrifuge 4 is connected with refrigeration mother liquor tank 5 through refrigeration centrifugal mother liquor pipeline G8, and the upper overflow port of refrigeration thick tank 3 is also connected with refrigeration mother liquor tank 5 through refrigeration thick tank overflow pipeline G6, and refrigeration thick tank 3 and refrigeration mother liquor tank 5 are both provided with stirring mechanisms.

[0032] The bottom outlet of the freezing mother liquor tank 5 is connected to the inlet of the pyrogenic crystallizer 6 through a freezing mother liquor pump B4 and a freezing mother liquor discharge pipeline G9, the side wall circulating outlet of the bottom cone of the pyrogenic crystallizer 6 is connected to the tube side inlet of the forced evaporator 7, the tube side outlet of the forced evaporator 7 is connected to the circulating inlet of the pyrogenic crystallizer 6 through a forced circulating pump B5 and an evaporation circulating pipeline G10. The outlet of the steam pipeline G15 is connected to the shell side inlet of the forced evaporator 7, and the shell side outlet of the forced evaporator 7 is connected to the inlet of the condensed water tank 11.

[0033] The bottom salt leg outlet of the pyrogenic crystallizer 6 is connected to the inlet of the evaporation discharge pump B6, the outlet of the evaporation discharge pump B6 is connected to the inlet of the scraper centrifuge 8 through an evaporation crystal slurry discharge pipeline G11, the solid phase outlet of the scraper centrifuge 8 is connected to a scraper centrifuge salt discharge pipeline G12, the mother liquor outlet of the scraper centrifuge 8 is connected to the inlet of the evaporation mother liquor tank 9 through an evaporation centrifuge mother liquor pipeline G13, the outlet of the evaporation mother liquor tank 9 is connected to the inlet of the evaporation mother liquor pump B7, the outlet of the evaporation mother liquor pump B7 is connected to the evaporation circulating pipeline G10 through a reflux pipeline, and the outlet of the evaporation mother liquor pump B7 is connected to the lithium precipitation mother liquor pipeline G1 through an evaporation mother liquor discharge pipeline G14.

[0034] The top secondary steam outlet of the pyrogenic crystallizer 6 is connected to the shell side inlet of the condenser 10, the tube side of the condenser 10 is connected to a circulating cooling water pipeline, the shell side condensed water outlet of the condenser 10 is connected to the inlet of the condensed water tank 11, and the outlet of the condensed water tank 11 is connected to the water supplement inlet of the leaching filtration or lithium precipitation section through a condensed water pump B8.

[0035] The lithium precipitation mother liquor from the lithium precipitation mother liquor pipeline G1 enters the carbonization freezing crystallizer 1, the material overflowing from the upper side wall is sent into the tube side of the freezing heat exchanger 2 through a carbonization freezing circulating pipeline G2 and a feed liquid circulating pump B1, cooled, and then returned to the freezing crystallizer 1 and flows along the central pipe of the freezing crystallizer 1 to the bottom of the freezing heat exchanger 2, flows out and then flows upward until overflowing from the upper side wall of the carbonization freezing crystallizer 1, and is transported and circulated by the feed liquid circulating pump B1.

[0036] The refrigerant circulating pump B2 circulates the refrigerant in the shell side of the freezing heat exchanger 2 through a refrigerant circulating pipeline G3 to cool the tube side circulating material, carbon dioxide enters the carbonization freezing crystallizer 1 through a carbon dioxide pipeline G4, lithium carbonate in the lithium precipitation mother liquor reacts in the carbonization freezing crystallizer 1 to generate lithium bicarbonate, and sodium sulfate in the solution is cooled to precipitate in the form of mirabilite, which is sent into the freezing thick tank 3 through a freezing discharge pump B3 and a freezing crystal slurry discharge pipeline G5.

[0037] The upper clear liquid of the material in the frozen thick tank 3 after settlement is sent into the frozen mother liquor tank 5 through the overflow pipeline G6 of the frozen thick tank, the high solid content crystal slurry discharged from the bottom of the frozen thick tank 3 is sent into the double push centrifuge 4 for solid-liquid separation, the separated mirabilite is sent to outside through the salt outlet pipeline G7 of the double push centrifuge, and the separated mother liquor is sent into the frozen mother liquor tank 5 through the frozen centrifugal mother liquor pipeline G8, and then is sent into the pyrogenic crystallizer 6 through the frozen mother liquor pump B4 and the frozen mother liquor discharge pipeline G9 for next step processing.

[0038] The mother liquor after carbonization and freezing treatment is sent into the pyrogenic crystallizer 6 through the frozen mother liquor discharge pipeline G9, flows out from the side wall of the cone bottom into the tube side of the forced evaporator 7 for heating evaporation, and is circulated back to the pyrogenic crystallizer 6 through the evaporation circulation pipeline G10 and the forced circulation pump B5, and the forced circulation pump B5 provides the power for the circulation of the material between the forced evaporator 7 and the pyrogenic crystallizer 1,

[0039] With the steam entering the shell side of the forced evaporator 7 through the steam pipeline G15, the temperature of the material in the pyrogenic crystallizer 6 is increased, the lithium bicarbonate in the solution is gradually decomposed into carbon dioxide and lithium carbonate, and a small amount of lithium carbonate is precipitated; when the temperature is increased to the boiling point and continues to be heated, the material in the pyrogenic crystallizer 6 is boiled and evaporated, with the water in the solution evaporated out of the system, a large amount of lithium carbonate is precipitated, the secondary steam evaporated is sent into the shell side of the condenser 10 for heat exchange and condensation by circulating cooling water, and then is temporarily stored in the condensate tank 11, and the condensate flowing out of the shell side of the forced evaporator 7 is also temporarily stored in the condensate tank 11, and then is pumped back to the front end of the leaching and filtration and lithium precipitation section for recycling by the condensate pump B8.

[0040] The crystal slurry at the bottom of the pyrogenic crystallizer 6 is sent into the scraper centrifuge 8 through the evaporation discharge pump B6 and the evaporation crystal slurry discharge pipeline G11, the separated lithium carbonate is discharged through the scraper centrifuge salt outlet pipeline G12, and then is subjected to centralized drying and packaging treatment. The mother liquor separated by the scraper centrifuge 8 is sent into the evaporation mother liquor tank 9 through the evaporation centrifugal mother liquor pipeline G13, and then is sent back to the pyrogenic crystallization system through the evaporation mother liquor pump B7, and is discharged through the evaporation mother liquor discharge pipeline G14, and is mixed with new lithium precipitation mother liquor to enter the carbonization and freezing crystallizer 1 for circulation, so that the above technical scheme achieves the effects of low cost, high recovery rate and continuous and stable operation.

[0041] The above merely describes preferred and feasible embodiments of the present application, shows and describes the basic principles, main features and advantages of the present application, and is not intended to limit the patent protection scope of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments. In addition to the above embodiments, the present application can also have other implementation manners without departing from the spirit and scope of the present application. The present application can also have various changes and improvements, and any technical solution formed by equivalent replacement or equivalent transformation falls within the protection scope of the present application. The protection scope of the present application is defined by the appended claims and their equivalents. The technical features not described in the present application can be realized by or using the prior art, and will not be described here.

Claims

1. A lithium carbonate lithium precipitation mother liquor recycling system, comprising a carbonization freezing crystallizer (1), characterized in that: The outlet of the lithium precipitation mother liquor pipeline (G1) is connected with the tube side outlet of the refrigeration heat exchanger (2), and the two are connected with the feed inlet of the carbonization refrigeration crystallizer (1) together. The carbon dioxide inlet of the carbonization refrigeration crystallizer (1) is connected with the carbon dioxide pipeline (G4). The upper side wall circulation outlet of the carbonization refrigeration crystallizer (1) is connected with the tube side inlet of the refrigeration heat exchanger (2) through a liquid circulation pump (B1). The bottom crystal slurry outlet of the carbonization refrigeration crystallizer (1) is connected with the feed inlet of the refrigeration thick tank (3) through a refrigeration discharge pump (B3). The bottom outlet of the refrigeration thick tank (3) is connected with the inlet of the double-push centrifuge (4). The solid phase outlet of the double-push centrifuge (4) is connected with the double-push centrifuge salt outlet pipeline (G7). The liquid phase outlet of the double-push centrifuge (4) is connected with the inlet of the refrigeration mother liquor tank (5). The outlet of the refrigeration mother liquor tank (5) is connected with the inlet of the pyrogenic crystallizer (6) through a refrigeration mother liquor pump (B4). The side wall circulation outlet of the bottom cone of the pyrogenic crystallizer (6) is connected with the tube side inlet of the forced evaporator (7). The tube side outlet of the forced evaporator (7) is connected with the circulation inlet of the pyrogenic crystallizer (6) through a forced circulation pump (B5). The bottom salt leg outlet of the pyrogenic crystallizer (6) is connected with the inlet of the scraper centrifuge (8) through an evaporation discharge pump (B6). The solid phase outlet of the scraper centrifuge (8) is connected with the scraper centrifuge salt outlet pipeline (G12). The mother liquor outlet of the scraper centrifuge (8) is connected with the inlet of the evaporation mother liquor tank (9).

2. The lithium carbonate lithium precipitation mother liquor recycling system according to claim 1, characterized in that: The outlet of the evaporation mother liquor tank (9) is connected with the inlet of the evaporation mother liquor pump (B7). The outlet of the evaporation mother liquor pump (B7) is connected with the evaporation circulation pipeline (G10) through a reflux pipeline. The outlet of the evaporation mother liquor pump (B7) is connected with the lithium precipitation mother liquor pipeline (G1) through an evaporation mother liquor discharge pipeline (G14).

3. The lithium carbonate lithium precipitation mother liquor recycling system according to claim 1, characterized in that: The outlet of the steam pipeline (G15) is connected with the shell side inlet of the forced evaporator (7). The shell side outlet of the forced evaporator (7) is connected with the inlet of the condensate tank (11).

4. The lithium carbonate lithium precipitation mother liquor recycling system according to claim 3, characterized in that: The top secondary steam outlet of the pyrogenic crystallizer (6) is connected with the shell side inlet of the condenser (10). The tube side of the condenser (10) is connected with a circulating cooling water pipeline. The shell side condensate outlet of the condenser (10) is connected with the inlet of the condensate tank (11). The outlet of the condensate tank (11) is connected with the water supplement inlet of the leaching filtration or lithium precipitation section through a condensate pump (B8).

5. The lithium carbonate lithium precipitation mother liquor recycling system according to claim 1, characterized in that: The shell side outlet of the refrigeration heat exchanger (2) is connected with the inlet of the refrigerant circulation pump (B2). The outlet of the refrigerant circulation pump (B2) is connected with the shell side inlet of the refrigeration heat exchanger (2) through a refrigerant circulation pipeline (G3).

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