The project scale has an annual output of 10,000 t/a battery-grade lithium carbonate, which was successfully put into production in 2018; In the project, brine in Jinaier Salt Lake District of Dongtai is used as raw material, and ion selective migration separation technology is used to separate magnesium and lithium to produce lithium-rich solution. The lithium-rich solution is purified by alkali liquor, treated by acid regulation and converted by soda ash to produce finished lithium carbonate. This project won the first prize of Excellent Consulting Achievements of China Nonferrous Metals Construction Association in 2018 and the first prize of Excellent Engineering Design Achievements of China Nonferrous Metals Construction Association in 2021.