Method for preparing lithium compound
The described method efficiently removes magnesium and sulfur impurities from lithium compounds through sulfuric acid leaching and high-temperature precipitation, reducing alkali agent use and process costs while producing high-purity lithium products.
WO2026134613A1PCT designated stage Publication Date: 2026-06-25POSCO HLDG INC
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- POSCO HLDG INC
- Filing Date
- 2025-10-23
- Publication Date
- 2026-06-25
AI Technical Summary
Technical Problem
Existing methods for producing lithium compounds are inefficient in removing magnesium, sulfur, and aluminum impurities, and often require excessive use of alkali agents, leading to high process costs.
Method used
A method involving sulfuric acid leaching, high-temperature precipitation of magnesium sulfate, and optional chemical removal using alkali agents to produce a lithium compound with reduced impurities, minimizing the use of alkali agents and energy consumption.
Benefits of technology
The method effectively reduces magnesium and sulfur impurities, lowers the amount of alkali agent required, and enhances the production of lithium compounds like lithium hydroxide or lithium carbonate with improved purity and reduced costs.
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Smart Images
Figure KR2025016951_25062026_PF_FP_ABST
Abstract
According to one embodiment of the present invention, provided is a method for preparing a lithium compound, the method comprising: a step for adding sulfuric acid to a raw material containing lithium and magnesium to leach out lithium and thereby obtain a sulfuric acid leachate; and a step for heating the sulfuric acid leachate to precipitate magnesium sulfate and thereby remove magnesium.
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