How to generate battery grade and high purity grade lithium hydroxide and lithium carbonate from high purity lithium sources

摘要

The present invention discloses methods and systems for producing battery grade and high purity grade lithium hydroxide and lithium carbonate from a high purity lithium source. The method according to the present invention includes a step of producing a purified lithium salt solution, a step of producing battery-grade lithium hydroxide, a step of producing high-purity grade lithium hydroxide, and a step of producing high-purity grade lithium carbonate. It has a battery-grade lithium carbonate production process. The system according to the present invention includes a purified lithium salt solution production subsystem, a battery-grade lithium hydroxide production subsystem, a high-purity grade lithium hydroxide production subsystem, and a high-purity grade lithium carbonate, which are arranged according to the production order. It has a lithium-producing subsystem and a battery-grade lithium carbonate-forming subsystem. In order to treat high-purity lithium sources with various lithium contents and types and contents of impurities, the present invention provides separate combinations with different physicochemical treatment methods depending on the quality of the high-purity lithium source. It can meet the quality requirements of battery grade and high purity grade lithium hydroxide and lithium carbonate products. The method according to the present invention is widely applicable as compared with existing manufacturing processes and manufacturing techniques, and most of the by-products are reusable, economical and environmentally friendly.