Journal
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
Volume 53, Issue 42, Pages 16502-16507Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ie502749n
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Funding
- National Natural Science Foundation of China [51074083]
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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 degrees 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.
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