A method for producing high purity lithium hydroxide monohydrate
Номер патента: EP4313866A1
Опубликовано: 07-02-2024
Автор(ы): Aleksandr Dmitriyevich RIABTSEV, Aleksandr Viktorovich LETUEV, Andrey Aleksandrovich KURAKOV, Nikolay Mikhaylovich NEMKOV, Valeriy Ivanovich TITARENKO
Принадлежит: Ecostar Nautech Co Ltd
Опубликовано: 07-02-2024
Автор(ы): Aleksandr Dmitriyevich RIABTSEV, Aleksandr Viktorovich LETUEV, Andrey Aleksandrovich KURAKOV, Nikolay Mikhaylovich NEMKOV, Valeriy Ivanovich TITARENKO
Принадлежит: Ecostar Nautech Co Ltd
Реферат: A method for producing high purity lithium hydroxide monohydrate from materials containing a lithium salt selected from Li2SO4, LiCl, Li2CO3 or mixtures thereof, includes membrane electrolysis of an aqueous solution of the indicated lithium salt using a cation exchange membrane and a nickel-plated stainless steel cathode. The catholyte is withdrawn from the circulating stream and evaporated to give crystals of lithium hydroxide monohydrate, which are separated from the mother liquor, washed with water and dried to give the final high purity lithium hydroxide monohydrate. Part of the spent washing solution is fed into the catholyte evaporation process. Part of the mother liquor formed after the separation of crystals of lithium hydroxide monohydrate is returned to the catholyte evaporation process. The reverse flow of the anolyte is replenished with a concentrated lithium salt solution prepared from the original lithium salt. Part of the spent catholyte withdrawn from the evaporation process is directed to the production of Li2CO3.
Method and system for preparing battery grade and high purity grade lithium hydroxide and lithium carbonate from high-impurity lithium sources
Номер патента: AU2022206767B2. Автор: Yali Li,Chunhui Yang,Yunfeng Li,Hongjun Jiang,Wenjun BAN,Rongfu CAI,Qiang MENG,Yihua DAI,Xinglong Wang,Chuanyong ZHENG. Владелец: Sinolithium Materials Ltd. Дата публикации: 2023-10-05.