Abstract

The present invention relates to a method for producing high-purity lithium carbonate by recovering lithium from scraps of a lithium ion secondary battery, and lithium carbonate produced thereby. The present invention may comprise: a step of roasting lithium ion secondary battery scrap powder in a reducing atmosphere; a step of wet-grinding; a step of water leaching while adding carbon dioxide; a step of removing impurities other than lithium by using an ion exchange resin; a step of synthesizing lithium carbonate by pyrolysis; and a step of obtaining solid lithium carbonate by filtering.

IPC Classes  ?

• C01D 15/08 - CarbonatesBicarbonates
• C01D 7/10 - Preparation of bicarbonates from carbonates
• C01D 7/12 - Preparation of carbonates from bicarbonates
• C01D 7/22 - Purification
• H01M 10/54 - Reclaiming serviceable parts of waste accumulators
• B01D 11/02 - Solvent extraction of solids
• B01D 15/36 - Selective adsorption, e.g. chromatography characterised by the separation mechanism involving ionic interaction, e.g. ion-exchange, ion-pair, ion-suppression or ion-exclusion

Abstract

Provided is a method for producing high-purity lithium carbonate by recovering lithium from lithium-ion secondary battery scrap, comprising: a process of roasting lithium-ion secondary battery scrap powder; a process of wet grinding; a process of carbon dioxide water leaching; a process of filtering the leached lithium bicarbonate solution; a process of purifying using an ion exchange resin; a process of synthesizing lithium carbonate by thermal decomposition of the leached lithium bicarbonate; a process of filtering lithium carbonate solution and separating it into a solid phase lithium carbonate and a liquid phase second lithium carbonate filtrate.

IPC Classes  ?

• C01D 15/08 - CarbonatesBicarbonates
• B01D 15/36 - Selective adsorption, e.g. chromatography characterised by the separation mechanism involving ionic interaction, e.g. ion-exchange, ion-pair, ion-suppression or ion-exclusion