US 12,466,739 B2
Method and system for preparing battery grade and high purity grade lithium hydroxide and lithium carbonate from high-impurity lithium sources
Yihua Dai, Sichuan (CN); Rongfu Cai, Sichuan (CN); Wenjun Ban, Sichuan (CN); Chunhui Yang, Sichuan (CN); Xinglong Wang, Sichuan (CN); Yunfeng Li, Sichuan (CN); Yali Li, Sichuan (CN); Chuanyong Zheng, Sichuan (CN); Qiang Meng, Sichuan (CN); and Hongjun Jiang, Sichuan (CN)
Assigned to COLI TECH PTE. LTD., Singapore (SG)
Filed by COLI TECH PTE. LTD., Singapore (SG)
Filed on Jun. 30, 2021, as Appl. No. 17/364,149.
Application 17/364,149 is a division of application No. 16/760,725, granted, now 11,097,954, previously published as PCT/CN2019/087170, filed on May 16, 2019.
Prior Publication US 2021/0323833 A1, Oct. 21, 2021
Int. Cl. C01D 15/08 (2006.01); C01D 15/02 (2006.01); C25B 1/16 (2006.01); C25B 9/23 (2021.01); H01M 4/58 (2010.01); H01M 10/0525 (2010.01)
CPC C01D 15/08 (2013.01) [C01D 15/02 (2013.01); C25B 1/16 (2013.01); C25B 9/23 (2021.01); H01M 4/58 (2013.01); H01M 10/0525 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A system for preparing battery grade and high purity grade lithium hydroxide and lithium carbonate from high-impurity lithium sources, characterized in that the system comprises a refined lithium salt solution preparation subsystem, a battery grade lithium hydroxide preparation subsystem, a high purity grade lithium hydroxide preparation subsystem, a high purity grade lithium carbonate preparation subsystem and a battery grade lithium carbonate preparation subsystem arranged in turn according to production sequence;
the refined lithium salt solution preparation subsystem comprises a filter module, a lithium extraction and adsorption module, a lithium enrichment and concentration module, a chemical impurity removal module, a lithium precipitation reaction module, an acidolysis and dissolution module and a purified lithium salt solution refining module; different combinations of the modules are selected for impurity pre-removal treatment according to different high-impurity lithium sources, and then the purified lithium salt solution refining module is used for refining to obtain a refined lithium salt solution meeting production requirements for battery grade and high purity grade lithium hydroxide and lithium carbonate;
the battery grade lithium hydroxide preparation subsystem comprises a composite electrodialysis device, an MVR evaporation concentration and crystallization device and a DTB cooling crystallizer or an OSLO cooling crystallizer connected in turn;
the high purity grade lithium hydroxide preparation subsystem comprises a dissolving tank, a filter and a DTB cooling crystallizer or an OLSO cooling crystallizer connected in turn;
the high purity grade lithium carbonate preparation subsystem comprises a dissolving tank, a filter and a first carbonization reactor connected in turn; and
the battery grade lithium carbonate preparation subsystem comprises a second carbonization reactor and an aging cell.