Lithium composite extractant and method for extracting lithium

By adopting a composite extractant system, including carbonyl compounds, salicylate compounds, organophosphorus compounds and phenyl biguanide, the existing lithium extractant organic solvents have been solved, with high efficiency, strong selectivity and environmentally friendly lithium extraction effects.

CN119899941AActive Publication Date: 2025-04-29INSTITUTE OF PROCESS ENGINEERING CHINESE ACADEMY OF SCIENCES
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Patent Information

Application Number
CN202510406963.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-04-02
Publication Date
2025-04-29
Estimated Expiration
2045-04-02

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Abstract

The invention belongs to the field of selective extraction of lithium, and provides a lithium composite extractant and a method for extracting lithium, the composite extractant comprises a carbonyl compound 1A, a salicylate compound 1B, an organic phosphorus compound 1C, phenyl biguanide and a diluent. The composite extracting agent provided by the invention is low in water solubility, stable under acid-base conditions, high in phase splitting speed, non-emulsifying, high in selectivity and low in total organic carbon (TOC) in raffinate, the raffinate can be discharged after being simply treated, the extracting agent can be recycled, and the extraction performance is basically not reduced. The extracted high-purity lithium-containing solution can be used for preparing high-purity lithium carbonate, so that short-process preparation of battery-grade lithium carbonate is realized.
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