Lithium extraction agent for lithium precipitation mother liquor and extraction method thereof

Abstract

A lithium extraction agent for lithium precipitation mother liquor includes a solute and an organic solvent. The solute includes at least one of 2,3,7,8-tetraaminophenazine-1,4,6,9-tetrone and terpyridine, and the organic solvent includes at least one of dichloromethane, chloroform, carbon tetrachloride, bromobenzene, and carbon disulfide. The lithium extraction agent can be used to extract lithium from the lithium precipitation mother liquor with a wide pH range. After entering the lithium extraction agent, lithium ions quickly complex with the solute in the lithium extraction agent to form a solid phase. It only requires leaving the extracted mixture A to stand for phase separation, allowing lithium to exist in a lithium-containing solid complex in the lower oil phase, and filtering the lower oil phase to obtain the lithium-containing solid complex, and the lithium-containing solid complex has a low sodium residue content.

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