METHOD FOR MANUFACTURING LITHIUM CARBONATE FROM MATERIAL RECOVERED FROM LITHIUM ION SECONDARY BATTERIES

摘要

PURPOSE: A method for manufacturing lithium carbonate is provided to enable crude separation of nickel and lithium in an organic phase while concentrating a lithium concentration to a concentration of recovering as a lithium carbonate. CONSTITUTION: A method for manufacturing lithium carbonate, in recovering valuable resources of a lithium-ion battery, reducing impurities from lithium carbonate, having a pretreatment process, comprises: a first step cleaning an organic phase containing nickel and lithium prepared by a solvent extraction by use of a sulfuric acid solution containing nickel and enriching lithium in the cleaning solution; a second step extracting a residual nickel only by an organic solvent from a post-cleaning solution in which the lithium is enriched; and a third step controlling pH of the post-extraction solution containing the lithium by ammonia water or lithium hydroxide.