Method and system for preparing battery grade and high purity grade lithium hydroxide and lithium carbonate from high-impurity lithium sources

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.