Preparation of lithium phosphate from waste liquid of retired lithium batteries

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Abstract Consindering the large amount of discarded lithium batteries and the high content of lithium, lithium resources from the waste liquid of retired lithium batteries were studied. According to the characteristics of high sodium content and high alkali content in the solution, lithium was recovered by sodium phosphate precipitation method. The effects of various process parameters on the recovery yield, purity and particle size of lithium phosphate were systematically studied. The optimized process conditions were as follows: reaction temperature was 102 ℃, dosage of sodium phosphate was 1.1 of the theoretical amount, concentration of sodium phosphate was 350 g·L^-1, feeding rate was 5 mL·min^-1, stirring rate was 500 r·min^-1, the cold water washing is 1 L. Under the optimized conditions, the precipitation yield of lithium phosphate was 92.63%, the purity of lithium phosphate was 98.81%. The products meet the industry standard of lithium phosphate for color phosphor. This process can be widely used in various high-sodium lithium-containing solutions, especially in the recovery of lithium resources from solutions with low lithium concentration, which not only solves the problem of waste liquid discharge of retired lithium batteries, but also provides a new way for lithium resource extraction.

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	Articles by authors
	YAO Xiaoyan
	WANG Yuxuan
	XU Mengna
	SUN Shuying

Keywords： high sodium lithium solution spent lithium ion battery lithium phosphate chemical precipitation

Received 2023-02-08;

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YAO Xiaoyan, WANG Yuxuan, XU Mengna, SUN Shuying.Preparation of lithium phosphate from waste liquid of retired lithium batteries[J] Chemcial Industry and Engineering, 2024,V41(3): 179-190

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