Patent ID: 11970405
Assignee: JX METALS CORPORATION
Field: Chemical engineering (Chemistry)
Classification: CPC C  B  H  Y | IPC C  H

Claim 0:
1. A method for producing lithium carbonate from lithium ion battery waste, the lithium ion battery waste comprising battery positive material components containing Li and at least one metal selected from Co, Ni and Mn, wherein the method comprises:
a wet process, wherein the at least one metal of the battery positive material components is separated from the lithium ion battery waste to obtain crude lithium carbonate,
a dissolution step of dissolving the crude lithium carbonate in a liquid while feeding a carbon dioxide gas; and a decarbonization step of heating a lithium dissolved solution obtained in the dissolution step to release carbonic acid, and
wherein when dissolving the crude lithium carbonate in the liquid in the dissolution step, the liquid is stirred in a reaction vessel using a stirrer, and a ratio of a diameter (d) of a stirring blade of the stirrer to an inner diameter (D) of the reaction vessel (d/D) is from 0.2 to 0.5.