A method for refining and purifying crude lithium carbonate to produce battery-grade lithium carbonate

By employing reverse carbonization, composite impurity removal, and microwave pyrolysis, the problems of long cycle time and high cost in existing lithium carbonate refining and purification processes have been solved, achieving efficient production of high-purity battery-grade lithium carbonate with significant technical benefits.

CN117285051BActive Publication Date: 2026-04-10JIANGXI JINSHANG LI NEW MATERIAL TECHNOLOGY CO LTD
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Patent Information

Application Number
CN202310337841.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-03-31
Publication Date
2026-04-10
Estimated Expiration
2043-03-31

AI Technical Summary

Technical Problem

Existing lithium carbonate refining and purification processes suffer from problems such as long reaction cycles, high costs, and difficulty in achieving the required product purity. In particular, the limited cycle performance of ion exchange resins leads to increased production costs.

Method used

By employing reverse carbonization, composite impurity removal, and microwave pyrolysis, and by adding low-frequency ultrasonic treatment and EDTA-Li complexation reaction during the carbonization process, combined with microwave heating, the conversion efficiency is improved and the lithium loss rate is reduced, thus achieving the production of high-purity battery-grade lithium carbonate.

Benefits of technology

It significantly improves the conversion efficiency and purity of lithium carbonate, shortens the production cycle, reduces energy consumption and lithium loss rate, and has good application value.

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Abstract

The application discloses a method for producing battery-grade lithium carbonate by refining and purifying crude lithium carbonate, and belongs to the technical field of refining and purifying crude lithium carbonate. The method mainly refines and purifies the crude lithium carbonate through reverse carbonization, composite impurity removal and microwave pyrolysis. The reverse carbonization accelerates the countercurrent conversion of the dissolved lithium carbonate and the mass transfer carbon dioxide, effectively reduces the resistance of the carbon dioxide and the lithium carbonate carbonization reaction, and further significantly improves the conversion efficiency and shortens the reaction period. The double composite impurity removal further effectively controls the content of impurities such as calcium, magnesium, iron and magnetic substances in the carbonization liquid. The microwave pyrolysis process greatly reduces the energy consumption required for pyrolysis, effectively shortens the reaction time and significantly reduces the loss rate of lithium in the pyrolysis reaction process. The refining and purifying process of the application greatly shortens the reaction period on the basis of ensuring the purifying effect, and has good application value.
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