Method for efficiently and cleanly extracting lithium from low-grade lepidolite

By mixing lepidolite with auxiliary materials such as sodium potassium sulfate, calcium sulfate, calcium hydroxide and lime, pressing it into brick blanks, and then firing it at high temperature, followed by leaching and impurity removal, the problems of high energy consumption, environmental unfriendliness and difficulty in impurity removal of low-grade lepidolite for lithium extraction have been solved, and a highly efficient and environmentally friendly lepidolite lithium extraction process has been achieved.

CN119372480BActive Publication Date: 2025-11-28宜丰国轩锂业有限公司
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Patent Information

Application Number
CN202411412340.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-10-11
Publication Date
2025-11-28
Estimated Expiration
2044-10-11

AI Technical Summary

Technical Problem

Existing lithium extraction processes from low-grade lithium mica are energy-intensive, environmentally unfriendly, difficult to remove impurities, and costly.

Method used

Lithium mica ore is mixed with sodium potassium sulfate, calcium sulfate, calcium hydroxide, lime and quartz, pressed into brick blanks and then fired at high temperature. After leaching, the sodium potassium sulfate is recovered through impurity removal, concentration, lithium precipitation and neutralization. The auxiliary materials are recycled and the reaction conditions are optimized to improve the lithium conversion rate and leaching rate.

Benefits of technology

This method enables efficient and clean lithium extraction from low-grade lepidolite, improving lithium conversion and leaching rates, reducing production costs, minimizing environmental pollution, and achieving material recycling.

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Abstract

The application discloses a kind of low-grade lepidolite efficient clean lithium extraction methods, comprising the following steps: S1: lithium mica ore is mixed with sodium potassium sulfate, calcium sulfate, calcium hydroxide, lime, quartz uniformly, then mixed raw material is pressed into brick billet;S2, the brick billet is stacked, preheating drying, high-temperature calcination, cooling, crushing, powder after grinding to obtain fine powder clinker;S3: the fine powder clinker is immersed with water liquid, then through solid-liquid separation to obtain leaching solution;The application can accelerate the solid-phase reconstruction reaction of lepidolite by using sodium sulfate potassium salt, thereby improving the conversion rate of lithium;On the other hand, by adding quartz, the free energy of the solid-phase reaction between lepidolite and sulfate can be effectively reduced, so that low-grade lepidolite can also have a good transformation rate;Adding lime and calcium hydroxide is significantly better than adding calcium carbonate, not only can effectively absorb the HF gas generated in the reaction, but also can avoid the reduction of lithium leaching due to the combination of fluorine and lithium, which is beneficial to improve the leaching rate of lithium.
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