METHOD FOR RECOVERING LITHIUM FROM LITHIUM SOLUTION

摘要

PURPOSE: A lithium collecting method from a lithium solution is provided to collect high purity lithium at a high yield by selectively concentrating a low concentration lithium solution. CONSTITUTION: A lithium collecting method comprises the following steps. An extraction solvent layer in which lithium is concentrated is separated after a solvent is extracted by adding an extraction solvent to a material solution which contains more than one kind of element selected among lithium, an alkali metal except lithium, and an alkali earth metal. An inorganic acid solution layer which contains lithium is separated after back extraction is implemented by adding the inorganic acid solution to the separated extraction solution. Lithium salt is generated by implementing salt formation reaction in the separated inorganic acid solution. [Reference numerals] (AA) Inorganic acid solution; (BB) Back extraction; (CC) Li contained solution; (DD) Carbonation; (EE) Extraction; (FF) Li, and alkali (earth)metal contained raw material solution; (GG) Alkali (earth)metal contained solution; (HH) Extraction solvent; (II) Solution