Method for recovering lithium from waste primary lithium battery leachate and producing lithium chloride therefrom

A method for recovering lithium from waste primary lithium battery leachate and producing lithium chloride therefrom, comprising the steps of:

• (1) preparing a lithium purification solution by separating impurities from a leachate of a waste primary lithium battery;
• (2) separating an insoluble lithium compound from the lithium purification solution;
• (3) converting the insoluble lithium compound into a lithium chloride solution;
• and
• (4) producing lithium chloride powder from the lithium chloride solution;
• wherein the impurities are separated from the leachate of the waste primary lithium battery by a pH adjustment method or a co-precipitation method;
• wherein the insoluble lithium compound is lithium carbonate or lithium phosphate;
• wherein the step of converting the insoluble lithium compound into a lithium chloride solution is performed by a wet conversion method;
• wherein the recovered lithium chloride powder is crystalline;
• wherein, a filtrate after the separating the lithium phosphate in step (2) undergoes a purification reaction to remove phosphate (PO4) components;
• and
• wherein, after the purification reaction, an additional precipitant is used to convert the filtrate into an insoluble compound, Li—Al-LDH(LiAl2(OH)72H2O), thereby recovering lithium at a yield of 99% or more.