Method for recovering lithium chloride resources in lithium perchlorate mother liquor

By diluting lithium perchlorate mother liquor and adding sodium carbonate to precipitate lithium, and combining hydrochloric acid reaction and distillation technology, the problem of lithium and perchlorate ion recovery in lithium perchlorate mother liquor is solved, achieving efficient resource recovery and low-cost treatment, which is suitable for the field of lithium battery electrolytes.

CN117985744BActive Publication Date: 2026-07-03XINYU GANFENG LITHIUM IND CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
XINYU GANFENG LITHIUM IND CO LTD
Filing Date
2023-12-25
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

The lithium and perchlorate resources in lithium perchlorate mother liquor cannot be effectively recovered and utilized, resulting in resource waste and site occupation problems.

Method used

Lithium perchlorate mother liquor was diluted with water and then precipitated with sodium carbonate solution. Subsequently, it was concentrated and reacted with hydrochloric acid. Combined with atmospheric and vacuum distillation, lithium and perchloric acid were separated and recovered, and resources were recovered by utilizing the solubility and distillation characteristics of each substance.

Benefits of technology

It achieves a lithium recovery rate of over 90% and a perchlorate recovery rate of over 76%, is environmentally friendly and low-cost, meets the requirements for industrial-grade lithium carbonate, is easy to industrialize, and has good economic benefits.

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Abstract

The application belongs to the technical field of lithium battery electrolyte resource recovery, and discloses a method for recovering lithium chloride resources in lithium perchlorate mother liquor. The method for recovering lithium chloride resources in lithium perchlorate mother liquor comprises the following steps: mixing and diluting lithium perchlorate mother liquor with water to obtain diluted lithium perchlorate mother liquor; then adding sodium carbonate solution for mixing and lithium precipitation to obtain lithium precipitation mother liquor and lithium carbonate dry material; concentrating the lithium precipitation mother liquor, then adding hydrochloric acid for reaction, and then cooling and precipitating sodium to obtain sodium chloride and perchloric acid mother liquor; the perchloric acid mother liquor is subjected to normal pressure distillation and vacuum distillation in sequence to obtain fractionated perchloric acid solution, and the remaining solution after the vacuum distillation is returned to be mixed with the lithium precipitation mother liquor. The method utilizes the solubility of lithium carbonate and the boiling point of perchloric acid to realize recovery of lithium chloride resources in lithium perchlorate mother liquor, wherein the recovery rate of lithium is greater than 90%, the recovery rate of perchlorate is greater than 76%, it is environmentally friendly, the initial investment is small, and the recovery cost is low.
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