Method for producing lithium hydroxide

The method uses a chelating resin and acid solutions to remove impurities and control calcium ion concentration, addressing purity issues in lithium hydroxide production, achieving high-purity lithium hydroxide with reduced sodium contamination.

RU2865809C1Active Publication Date: 2026-07-09KOREA ZINC CO LTD +1
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Patent Information

Authority / Receiving Office
RU · RU
Patent Type
Patents
Current Assignee / Owner
KOREA ZINC CO LTD
Filing Date
2024-03-29
Publication Date
2026-07-09

AI Technical Summary

Technical Problem

Conventional lithium hydroxide production methods result in the formation of cations such as calcium and magnesium as impurities, reducing the purity of lithium hydroxide, and there is a need for a method to produce high-purity lithium hydroxide without sodium ion contamination and to control impurity concentrations to trace levels.

Method used

A method involving a series of steps using a chelating resin to remove cationic impurities from a lithium hydroxide solution, including passing the solution through a chelating resin, followed by binding acid, distilled water, and a separating acid solution to replace impurity ions with hydrogen ions, ensuring high purity and trace-level control of calcium ions.

Benefits of technology

The method effectively removes cationic impurities and controls calcium ion concentration to trace levels, producing high-purity lithium hydroxide with improved purity and reduced sodium ion contamination.

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Abstract

FIELD: chemical industry.SUBSTANCE: invention which can be used in the manufacture of secondary lithium batteries. First, a solution of lithium hydroxide (S100) is obtained, containing impurities, for example calcium ions at a concentration of 20-25 ppm. Then (S300) a solution of binding acid with a concentration of 60-90 g / l is passed through a chelating resin at a volume ratio of (4-8):1. Additionally (S400) distilled water can be passed through the chelate resin in a volume ratio of (1.5-6):1. After this (S200), the lithium hydroxide solution is passed through the chelating resin at a volume ratio of (16.7-83.3):1, whereby the ions contained in the impurities are replaced by ions bound to the chelating resin and become bound to the chelating resin, and the lithium ions pass through the chelating resin. Additionally (S500), a solution of separating acid with a concentration of 60-90 g / l is passed through a chelating resin bound with impurities at a volume ratio of (5-6.7):1, as a result of which the impurities bound to the chelating resin are replaced by hydrogen ions from the separating acid solution.EFFECT: ensuring the production of high-purity lithium hydroxide that does not contain sodium ion impurities. Eliminating the need to control impurities down to trace levels.9 cl, 5 dwg, 4 tbl, 25 ex
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