Systemic and Direct Production of Battery-Grade Lithium Carbonate from a Saline Lake

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• 作者：Zhenhua Xu ; Haijun Zhang ; Ruiyuan Wang ; Wenjun Gui ; Guofeng Liu ; Ying Yang
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2014
• 出版时间：October 22, 2014
• 年：2014
• 卷：53
• 期：42
• 页码：16502-16507
• 全文大小：362K
• ISSN：1520-5045

文摘

A process was developed to produce battery-grade lithium carbonate from the Damxungcuo saline lake, Tibet. A two-stage Li₂CO₃ precipitation was adopted in a hydrometallurgical process to remove impurities. First, industrial grade Li₂CO₃ was obtained by removing Fe³⁺, Mg²⁺, and Ca²⁺ from a liquor containing lithium. Second, industrial grade Li₂CO₃ was treated by CO₂ to get the more soluble bicarbonates. EDTA-Li (lithium 2-carboxyhydrazine-1,1,2-tricarboxylate) was added to chelate Ca²⁺ and Mg²⁺. The decomposition of LiHCO₃ produced insoluble Li₂CO₃ at 85 掳C. The final precipitation yielded a high purity (99.6%) and homogeneous Li₂CO₃. Some factors affecting the production efficiency were investigated. The results showed that an L/S mass ratio of 30:1 favored the formation of a Li₂CO₃ slurry; a molar ratio of EDTA-Li to (Ca+Mg) 1.05:1 and hot water washing precipitate (L/S mass ratio 1:1) promoted ions removal; a cyclic use of filtrate improved the recovery of lithium.