A process for the co-production of lithium carbonate series products from a lithium-containing solution

Abstract

The present application relates to a method for co-production of lithium carbonate series products from lithium-containing solution. The method uses purified sodium carbonate solution to precipitate lithium carbonate, which is then converted into lithium bicarbonate solution, filtered and decarburized, and through optimization of conventional purification process steps and parameters, high-purity lithium carbonate, battery-grade lithium carbonate and industrial-grade lithium carbonate products are obtained without introducing additional high-cost purification steps such as ion exchange resin / membrane. The process maximizes the use of lithium-containing solution, shortens the process flow and time, and has good economic benefits. At the same time, the by-products of each stage of the scheme can be reused, only a small amount of waste solution is produced, which can realize the recycling of mother liquor, improve the comprehensive yield of products, and effectively reduce the comprehensive cost.

Description

A method for co-producing a series of lithium carbonate products from a lithium-containing solution Technical Field

[0001] This invention relates to the field of lithium salt material preparation technology, and more specifically, to a method for co-producing a series of lithium carbonate products from a lithium-containing solution. Background Technology

[0002] Lithium carbonate has multiple applications in current industrial production. On the one hand, it has important uses in pharmaceuticals, catalysts, and ceramics; on the other hand, it plays a crucial role in the production of lithium-ion batteries. Lithium carbonate can be classified by purity into: industrial-grade lithium carbonate (99%), battery-grade lithium carbonate (99.5%), and high-purity lithium carbonate (99.9%). Due to different applications, the requirements for purity and particle size of lithium carbonate vary. 99.5% battery-grade lithium carbonate is used as the cathode material in lithium-ion batteries; 99.9% high-purity lithium carbonate is used as the electrolyte in lithium-ion batteries. Industrial-grade lithium carbonate is mainly used in ceramic glazes, specialty glasses, semiconductor materials, and can also be used as a setting accelerator in cement admixtures.

[0003] Currently, there are many specifications for lithium carbonate products, and the production methods vary depending on the raw material conditions and production costs in different regions. Battery-grade lithium carbonate is mainly prepared by purifying industrial-grade lithium carbonate. Industrial-grade lithium carbonate is primarily extracted from ores such as spodumene or brine. The preparation methods for high-purity lithium carbonate are mainly divided into two categories: direct synthesis and crude lithium carbonate purification. Direct synthesis involves directly synthesizing high-purity lithium carbonate, mainly through precipitation methods such as LiOH solution with NH4HCO3, LiOH solution with CO2, and LiCl solution with CO2. Crude lithium carbonate purification involves removing impurities from industrial-grade lithium carbonate to improve its purity and meet high-purity standards. Crude lithium carbonate purification methods mainly include the Zinfl-Harder-Dauth method, recrystallization, causticization carbonation, electrolysis, hydrogenation precipitation, hydrogenation decomposition, and hydrogenation-ion exchange. Meanwhile, most lithium ore extraction enterprises currently operate on an intermittent or semi-automated basis, resulting in low production efficiency, poor product quality stability, and limited product variety. Furthermore, the production of various lithium carbonate products has not been coordinated in traditional production methods.

[0004] As the application of lithium products in high-tech fields continues to expand, the demand for lithium salts at home and abroad is also increasing, and the quality requirements for products are becoming higher and higher. Therefore, it is imperative to develop technologies that are more operable, have higher production line efficiency, and can produce lithium carbonate of various specifications in a combined manner. Summary of the Invention

[0005] To address the problems existing in current lithium carbonate production technology and to achieve the aforementioned objectives, this invention provides the following technical solution:

[0006] A method for co-producing a series of lithium carbonate products from a lithium-containing solution includes the following steps:

[0007] A. Add sodium carbonate solution to a lithium-containing solution to react, then let it stand and filter to obtain precipitate and filtrate;

[0008] B. Wash the precipitate from step A with water 1 to 3 times, with a solid-liquid ratio of 1:(5 to 6), and then separate the solid and liquid to obtain the slurry and wash water.

[0009] C. Prepare the washing material from step B into a slurry, introduce CO2 gas into the slurry until the liquid pH is 7.0-8.5, filter under pressure to obtain a carbonized clear liquid; heat the carbonized clear liquid to 90-95℃ and maintain it for 25-35 minutes to obtain lithium carbonate precipitate.

[0010] D. Separate and centrifuge the lithium carbonate precipitate obtained in step C. During centrifugation, wash with water at 80-90℃ at a liquid-to-solid ratio of 0.5-1:1 to obtain a wet lithium carbonate product and pyrolysis mother liquor. Add water to the wet lithium carbonate product at a liquid-to-solid ratio of 3:1 and stir and wash at 90℃ for 25-35 minutes. After centrifugation, wash with water at 80-90℃ at a liquid-to-solid ratio of 0.5-1:1 to obtain a wet refined lithium carbonate product and wash water. Dry the wet refined lithium carbonate product. Crush the dried product to a particle size of 1-5 micrometers to obtain battery-grade lithium carbonate.

[0011] E. Prepare the lithium carbonate precipitate obtained in step C into a slurry, introduce CO2 gas into the slurry until the liquid pH reaches 7.0-8.5, filter under pressure to obtain a carbonized clear liquid; heat the carbonized clear liquid to 90-95℃ and maintain it for 25-35 minutes, then perform high-temperature supermagnetic treatment; then separate the solid and liquid to obtain secondary refined lithium carbonate and pyrolysis mother liquor; dry the secondary refined lithium carbonate at 120℃-150℃, so that the moisture content of the dried product is controlled to ≤0.25%; pulverize the dried product to a particle size ≤220 micrometers to obtain high-purity lithium carbonate;

[0012] F. Mix the washing water from step B, the pyrolysis mother liquor from step D, the pyrolysis mother liquor from step E, and the lithium carbonate finished product dust collected in the drying and pulverizing steps of steps D and E. Adjust the pH of the solution to 6.5~7.0 with dilute sulfuric acid, and concentrate the mixture until the Li2O content is not less than 16g / L to obtain a concentrated solution. Add sodium carbonate solution to the obtained concentrated solution until no precipitate is formed, let it stand, and then filter to obtain the precipitate.

[0013] G. Wash the precipitate from step F with water 1-2 times, with a solid-liquid ratio of 1:(2-3), then separate the solid and liquid to obtain the washed material; prepare the washed material into a slurry, introduce CO2 gas into the slurry until the liquid pH is 7.0-8.5, filter under pressure to obtain a carbonized clear liquid; heat the carbonized clear liquid to 90-95℃ and maintain it for 25-35 minutes to obtain lithium carbonate precipitate; centrifuge to obtain lithium carbonate tertiary refined product; dry the lithium carbonate tertiary refined product at 120℃-150℃, so that the moisture content of the dried product is controlled to ≤0.5%, to obtain industrial grade lithium carbonate.

[0014] Further, the lithium-containing solution mentioned in step A is a clear solution with a Li₂O content of not less than 5 g / L; simultaneously, the sodium carbonate solution mentioned in step A is a solution with a sodium carbonate content of 200~300 g / L and suspended solids ≤30 mg / L. The volume ratio of the lithium-containing solution to the sodium carbonate solution mentioned in step A is 10:(0.1~1).

[0015] Furthermore, the washing temperature in step B is 70℃~90℃, the pressure is 0~0.1MPa, and the washing time is 1h~2h; the centrifuged wash water is returned as the washing liquid.

[0016] Furthermore, the temperature for drying the refined lithium carbonate in step D is 100℃~150℃, and the moisture content of the dried product is ≤0.25%.

[0017] Furthermore, the high-temperature supermagnetic treatment described in step E is carried out at 100–120°C and a magnetic field strength of 16,000–20,000 Gs. Beneficial effects.

[0018] The process described in this application uses lithium-containing solutions as starting material to produce industrial-grade lithium carbonate, battery-grade lithium carbonate, and high-purity lithium carbonate. This novel co-production process for producing a series of lithium carbonate products overcomes the drawbacks of single-product production (high energy consumption, high water consumption, high cost) and low technology content, achieving serialized production. Compared with single-product processes, it not only reduces investment but also provides stable product quality, lower costs, easier management, and better overall benefits. Specifically, the co-production process offers the following advantages:

[0019] ① The technical solution of this application can simultaneously produce three series of lithium carbonate products: industrial-grade lithium carbonate, battery-grade lithium carbonate, and high-purity lithium carbonate. Specifically, lithium carbonate is precipitated from purified sodium carbonate solution, then converted into lithium bicarbonate solution, filtered and decarbonized. Through optimization of conventional purification process steps and parameters, the production of high-purity lithium carbonate series products can be achieved without introducing additional high-cost purification steps such as ion exchange resins / membranes.

[0020] ②The technical solution of this application makes full use of equipment and raw and auxiliary materials according to the quality differences of the products, reduces equipment investment, and the liquids generated in the preparation process are all reprocessed and reused directly in the production process, which increases environmental protection and economy; at the same time, it improves production efficiency and reduces production costs.

[0021] ③ The co-production process for lithium carbonate series products can be adjusted according to different specifications, uses and market conditions to produce each product in a co-production ratio. Detailed Implementation Methods

[0022] This invention discloses a method for co-producing a series of lithium carbonate products from lithium ore. Those skilled in the art can refer to the content of this document and appropriately modify the process parameters to achieve the desired results. It is particularly important to note that all similar substitutions and modifications are obvious to those skilled in the art and are considered to be included in this invention. The methods and applications of this invention have been described through preferred embodiments. Those skilled in the art can clearly modify or appropriately change and combine the methods and applications described herein without departing from the content, spirit, and scope of this invention to realize and apply the technology of this invention. Examples

[0023] A. Add 300L of 300g / L sodium carbonate solution to 1000L of clear lithium-containing solution (25g / L) and react. Then let stand and filter to obtain precipitate and filtrate.

[0024] B. Wash the precipitate from step A with water three times (each time the washing temperature is 80℃~85℃, the pressure is 0~0.1MPa, and the washing time is 2h, 2h, and 1h respectively). The solid-liquid ratio of the washing solution is 1:5. Then the solid and liquid are separated to obtain the washing material and washing water.

[0025] C. Prepare the washing material from step B into a slurry, introduce CO2 gas into the slurry until the liquid pH is 7.0-7.2, filter under pressure to obtain a carbonized clear liquid; heat the carbonized clear liquid to 90°C and maintain for 25 minutes to obtain lithium carbonate precipitate;

[0026] D. Separate and centrifuge half of the total mass of lithium carbonate precipitate obtained in step C. During centrifugation, wash with 80°C water at a liquid-to-solid ratio of 0.5:1 to obtain wet lithium carbonate product and pyrolysis mother liquor. Add water to the wet lithium carbonate product at a liquid-to-solid ratio of 3:1 and stir and wash at 90°C for 25 minutes. After centrifugation, wash with 80°C water at a liquid-to-solid ratio of 0.5:1 to obtain wet refined lithium carbonate and wash water. Dry the wet refined lithium carbonate at 120°C to achieve a moisture content of 0.2%. Crush the dried product to a particle size of 2 micrometers to obtain battery-grade lithium carbonate.

[0027] E. Prepare a slurry by taking half the total mass of lithium carbonate precipitate obtained in step C. Pass CO2 gas into the slurry until the pH of the liquid reaches 7.0-7.2. Filter by pressure to obtain a carbonized clear liquid. Heat the carbonized clear liquid to 90°C and maintain it for 25 minutes. Then, subject it to high-temperature supermagnetic treatment at 100°C with a magnetic field strength of 16000 Gs. Separate the solid and liquid phases to obtain secondary refined lithium carbonate and pyrolysis mother liquor. Dry the secondary refined lithium carbonate at 120°C to achieve a moisture content of 0.25%. Crush the dried product to a particle size of 220 micrometers to obtain high-purity lithium carbonate.

[0028] F. Mix the washing water from step B, the pyrolysis mother liquor from step D, the pyrolysis mother liquor from step E, and the lithium carbonate finished product dust collected in the drying and pulverizing steps of steps D and E. Adjust the pH of the solution to 6.7~6.9 with dilute sulfuric acid, and concentrate the mixture until the Li2O content is not less than 16g / L to obtain a concentrated solution. Add sodium carbonate solution to the obtained concentrated solution until no precipitate is formed, let it stand, and then filter to obtain the precipitate.

[0029] G. Wash the precipitate from step F twice with water, the solid-liquid ratio of the washing solution being 1:2. Then separate the solid and liquid to obtain the washing material. Prepare the washing material into a slurry, and pass CO2 gas into the slurry until the liquid pH reaches 7.0-7.3. Filter by pressure to obtain a carbonized clear liquid. Heat the carbonized clear liquid to 90°C and maintain it for 35 minutes to obtain lithium carbonate precipitate. Centrifuge to obtain tertiary refined lithium carbonate. Dry the tertiary refined lithium carbonate at 120°C until the moisture content of the dried product is 0.3%, obtaining industrial-grade lithium carbonate. Example

[0030] A. Add 100L of 200g / L sodium carbonate solution to 1000L of clear lithium-containing solution with 5g / L to react, then let stand and filter to obtain precipitate and filtrate;

[0031] B. Wash the precipitate from step A with water three times (each time the washing temperature is 80℃~85℃, the pressure is 0~0.1MPa, and the washing time is 2h, 1h, and 1h respectively). The solid-liquid ratio of the washing solution is 1:6. Then the solid and liquid are separated to obtain the washing material and washing water.

[0032] C. Prepare the washing material from step B into a slurry, introduce CO2 gas into the slurry until the liquid pH is 7.0-7.5, filter under pressure to obtain a carbonized clear liquid; heat the carbonized clear liquid to 95°C and maintain for 30 minutes to obtain lithium carbonate precipitate;

[0033] D. Separate and centrifuge half the total mass of lithium carbonate precipitate obtained in step C. During centrifugation, wash with 85°C water at a liquid-to-solid ratio of 1:1 to obtain wet lithium carbonate product and pyrolysis mother liquor. Add water to the wet lithium carbonate product at a liquid-to-solid ratio of 3:1 and stir and wash at 90°C for 30 minutes. After centrifugation, wash with 85°C water at a liquid-to-solid ratio of 1:1 to obtain refined wet lithium carbonate and wash water. Dry the refined wet lithium carbonate product at 130°C to achieve a moisture content of 0.25%. Crush the dried product to a particle size of 3 micrometers to obtain battery-grade lithium carbonate.

[0034] E. Prepare a slurry by taking half the total mass of lithium carbonate precipitate obtained in step C. Pass CO2 gas into the slurry until the pH of the liquid reaches 7.5~7.7. Filter by pressure to obtain a carbonized clear liquid. Heat the carbonized clear liquid to 92°C and maintain it for 30 minutes. Then, subject it to high-temperature supermagnetic treatment at 110°C and a magnetic field strength of 18000 Gs. Then, separate the solid and liquid to obtain secondary refined lithium carbonate and pyrolysis mother liquor. Dry the secondary refined lithium carbonate at 130°C to achieve a moisture content of 0.15%. Crush the dried product to a particle size of 220 micrometers to obtain high-purity lithium carbonate.

[0035] F. Mix the washing water from step B, the pyrolysis mother liquor from step D, the pyrolysis mother liquor from step E, and the lithium carbonate finished product dust collected in the drying and pulverizing steps of steps D and E. Adjust the pH of the solution to 6.8-7.0 using dilute sulfuric acid, and then concentrate the mixture until the Li2O content is not less than 16 g / L to obtain a concentrated solution. Add sodium carbonate solution to the obtained concentrated solution until no precipitate is formed, and filter after standing to obtain the precipitate.

[0036] G. Wash the precipitate from step F twice with water, the solid-liquid ratio of the washing solution being 1:3. Then separate the solid and liquid to obtain the washed material. Prepare the washed material into a slurry, and pass CO2 gas into the slurry until the liquid pH reaches 7.5-7.7. Filter by pressure to obtain a carbonized clear liquid. Heat the carbonized clear liquid to 92°C and maintain it for 35 minutes to obtain lithium carbonate precipitate. Centrifuge to obtain tertiary refined lithium carbonate. Dry the tertiary refined lithium carbonate at 130°C until the moisture content of the dried product is 0.4%, obtaining industrial-grade lithium carbonate. Example

[0037] A. Add 200L of 250g / L sodium carbonate solution to 1000L of clear lithium-containing solution with a concentration of 15g / L to react, then let stand and filter to obtain precipitate and filtrate;

[0038] B. Wash the precipitate from step A with water three times (each time the washing temperature is 80℃~85℃, the pressure is 0~0.1MPa, and the washing time is 2h, 1h, and 1h respectively). The solid-liquid ratio of the washing solution is 1:6. Then the solid and liquid are separated to obtain the washing material and washing water.

[0039] C. Prepare the washing material from step B into a slurry, introduce CO2 gas into the slurry until the liquid pH is 8.3-8.5, filter under pressure to obtain a carbonized clear liquid; heat the carbonized clear liquid to 95°C and maintain for 35 minutes to obtain lithium carbonate precipitate;

[0040] D. Separate and centrifuge half the total mass of lithium carbonate precipitate obtained in step C. During centrifugation, wash with 90°C water at a liquid-to-solid ratio of 1:1 to obtain wet lithium carbonate product and pyrolysis mother liquor. Add water to the wet lithium carbonate product at a liquid-to-solid ratio of 3:1 and stir and wash at 90°C for 35 minutes. After centrifugation, wash with 90°C water at a liquid-to-solid ratio of 1:1 to obtain refined wet lithium carbonate and wash water. Dry the refined wet lithium carbonate product at 150°C to achieve a moisture content of 0.25%. Crush the dried product to a particle size of 5 micrometers to obtain battery-grade lithium carbonate.

[0041] E. Prepare a slurry by taking half the total mass of lithium carbonate precipitate obtained in step C. Pass CO2 gas into the slurry until the pH of the liquid reaches 8.3-8.5. Filter by pressure to obtain a carbonized clear liquid. Heat the carbonized clear liquid to 95°C and maintain it for 35 minutes. Then, subject it to high-temperature supermagnetic treatment at 120°C with a magnetic field strength of 20000 Gs. Separate the solid and liquid phases to obtain secondary refined lithium carbonate and pyrolysis mother liquor. Dry the secondary refined lithium carbonate at 150°C to achieve a moisture content of 0.25%. Crush the dried product to a particle size of 220 micrometers to obtain high-purity lithium carbonate.

[0042] F. Mix the washing water from step B, the pyrolysis mother liquor from step D, the pyrolysis mother liquor from step E, and the lithium carbonate finished product dust collected in the drying and pulverizing steps of steps D and E. Adjust the pH of the solution to 6.8-7.0 using dilute sulfuric acid, and then concentrate the mixture until the Li2O content is not less than 16 g / L to obtain a concentrated solution. Add sodium carbonate solution to the obtained concentrated solution until no precipitate is formed, and filter after standing to obtain the precipitate.

[0043] G. Wash the precipitate from step F twice with water, with a solid-liquid ratio of 1:3. Then separate the solid and liquid to obtain the washed material. Prepare the washed material into a slurry, and pass CO2 gas into the slurry until the pH of the liquid is 8.3-8.5. Filter by pressure to obtain a carbonized clear liquid. Heat the carbonized clear liquid to 95°C and maintain it for 35 minutes to obtain lithium carbonate precipitate. Centrifuge to obtain a three-stage refined lithium carbonate. Dry the three-stage refined lithium carbonate at 150°C to obtain a moisture content of 0.4% for the dried product, thus obtaining industrial-grade lithium carbonate.

[0044] This invention precipitates lithium carbonate from a purified sodium carbonate solution, then converts it into a lithium bicarbonate solution, filters and decarbonizes it. Through optimization of conventional purification process steps and parameters, high-purity lithium carbonate series products are produced without introducing additional high-cost purification steps such as ion exchange resins / membranes. Calculations show that the lithium leaching rate of this invention is as high as 99.5%. Furthermore, the process flow of this invention is concise, facilitating industrial production. The lithium carbonate series obtained in Examples 1-3 were analyzed, and the mass percentage content of each component is shown in Tables 1-3.

[0045]

[0046]

[0047]

[0048] Tables 1-3 list the mass composition analysis of high-purity lithium carbonate, battery-grade lithium carbonate, and industrial-grade lithium carbonate obtained in Examples 1-3. As shown in Table 1, the high-purity lithium carbonate product obtained by the method of this invention achieves a purity of 99.999%, with most impurities below 1 ppm. As shown in Table 2, the battery-grade lithium carbonate product obtained by the method of this invention achieves a purity of 99.5%–99.7%. As shown in Table 3, the industrial-grade lithium carbonate product obtained by the method of this invention achieves a purity of 99.2%–99.4%. All the obtained lithium carbonate series products meet the requirements of current relevant standards.

Claims

1. A method for co-producing a series of lithium carbonate products from a lithium-containing solution, comprising the following steps: A. Adding sodium carbonate solution to the lithium-containing solution to react, followed by standing and filtration to obtain precipitate and filtrate; B. Washing the precipitate from step A with water 1 to 3 times, wherein the solid-liquid ratio of the washing solution is 1:(5 to 6), and then separating the solid and liquid to obtain washing material and washing water; C. Prepare the slurry from step B, introduce CO2 gas into the slurry until the pH reaches 7.0–8.5, filter under pressure to obtain a carbonized clear liquid; heat the carbonized clear liquid to 90–95°C and maintain for 25–35 minutes to obtain lithium carbonate precipitate; D. Separate and centrifuge the lithium carbonate precipitate obtained in step C, rinsing it with water at 80–90°C at a liquid-to-solid ratio of 0.5–1:1 during centrifugation to obtain a wet lithium carbonate product and pyrolysis mother liquor; add water to the wet lithium carbonate product at a liquid-to-solid ratio of 3:1 and stir and wash at 90°C for 25–35 minutes, then separate and centrifuge, rinsing it with water at 80–90°C at a liquid-to-solid ratio of 0.5–1:1 during centrifugation to obtain lithium carbonate precipitate. Lithium wet concentrate and washing water; dry the lithium wet concentrate; pulverize the dried product to a particle size of 1-5 micrometers to obtain battery-grade lithium carbonate; E. prepare the lithium carbonate precipitate obtained in step C into a slurry, pass CO2 gas into the slurry until the liquid pH is 7.0-8.5, filter under pressure to obtain carbonized clear liquid; heat the carbonized clear liquid to 90-95℃ and hold for 25-35 minutes, then perform high-temperature supermagnetic treatment; then separate the solid and liquid to obtain secondary lithium carbonate concentrate and pyrolysis mother liquor; dry the secondary lithium carbonate concentrate at a temperature of 120℃-150℃, so that the moisture content of the dried product is controlled to ≤0.25%; pulverize the dried product to a particle size of ≤220 micrometers to obtain high-purity lithium carbonate; F. Mix the washing water from step B, the pyrolysis mother liquor from step D, the pyrolysis mother liquor from step E, and the lithium carbonate powder collected in the drying and pulverizing steps D and E. Adjust the pH of the solution to 6.5-7.0 using dilute sulfuric acid, then concentrate the mixture until the Li₂O content is not less than 16 g / L to obtain a concentrated solution. Add sodium carbonate solution to the obtained concentrated solution until no precipitate forms, let it stand, and then filter to obtain the precipitate. G. Wash the precipitate from step F with water 1-2 times. The solid content of the washing solution... The liquid ratio is 1:(2~3), and then solid-liquid separation is performed to obtain a slurry. The slurry is prepared into a liquid, and CO2 gas is introduced into the liquid until the pH of the liquid is 7.0~8.

5. The liquid is then filtered to obtain a carbonized clear liquid. The carbonized clear liquid is heated to 90~95℃ and maintained for 25~35 minutes to obtain lithium carbonate precipitate. The lithium carbonate is centrifuged to obtain a tertiary refined lithium carbonate. The tertiary refined lithium carbonate is dried at 120℃~150℃, and the moisture content of the dried product is controlled to be ≤0.5% to obtain industrial grade lithium carbonate.

2. The method for co-producing a series of lithium carbonate products from a lithium-containing solution according to claim 1, characterized in that, The lithium-containing solution mentioned in step A is a clear solution with a Li2O content of not less than 5 g / L.

3. The method for co-producing a series of lithium carbonate products from a lithium-containing solution according to claim 1, characterized in that, The sodium carbonate solution mentioned in step A is a solution with a sodium carbonate content of 200~300g / L and suspended matter ≤30mg / L.

4. The method for co-producing a series of lithium carbonate products from a lithium-containing solution according to claim 1, characterized in that, The volume ratio of the lithium-containing solution to the sodium carbonate solution added in step A is 10:(0.1~1).

5. A method for co-producing a series of lithium carbonate products from a lithium-containing solution according to claim 1, characterized in that, The washing temperature in step B is 70℃~90℃, the pressure is 0~0.1MPa, and the washing time is 1h~2h; the centrifuged wash water is returned as washing liquid.

6. The method for co-producing a series of lithium carbonate products from a lithium-containing solution according to claim 1, characterized in that, The temperature for drying the wet lithium carbonate product in step D is 100℃~150℃, and the moisture content of the dried product is ≤0.25%.

7. A method for co-producing a series of lithium carbonate products from a lithium-containing solution according to claim 1, characterized in that, The high-temperature supermagnetic field described in step E is carried out at 100–120°C and with a magnetic field strength of 16,000–20,000 Gs.

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