Method for the production of lithium carbonate
US12421126B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 8, 2022 |
| Grant date | Sep 23, 2025 |
| Priority date | — |
| Expiry date | Jun 4, 2044 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC22B3/22
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A process for the production of lithium carbonate from an aqueous salt solution at least containing lithium ions, chloride ions and calcium ions; the aqueous salt solution with a lithium content of at least 0.005% by weight and a maximum 0.2% by weight is condensed in a first evaporation step at a temperature between 40° C. and 160° C. until a concentrate I with a water content of ≤70% by weight and >60% by weight is formed. In a second evaporation step, the concentrate I is evaporated at a temperature between 60° C. and 180° C. until a concentrate II with a water content of ≤60% by weight is formed. In a Li concentration step, the lithium content is raised to at least 0.14% by heating the concentrate II to a temperature of at least 60° C. and thus a lithium-rich concentrate III and a residue III are formed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.