Process for the purification of lithium carbonate
Patent 6048507 Issued on April 11, 2000. Estimated Expiration Date: 
August 28, 2018. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
August 28, 2018. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2243392 2390095 2630374 3112170 3112171 3344046 3857920 Process for the production of high purity lithium hydroxide Continuous production of lithium carbonate Process for producing high purity lithium carbonate InventorsAssigneeApplicationNo. 143330 filed on 08/28/1998US Classes:423/179.5, Lithium423/421Alkali metal containing (Li, Na, K, Rb, or Cs)ExaminersPrimary: Bos, StevenAttorney, Agent or FirmForeign Patent References
International ClassesC01D 015/00C01D 007/00 AbstractDisclosed are methods for preparing high purity lithium carbonate which can be used for pharmaceutical applications, electronic grade crystals of lithium or to prepare battery-grade lithium metal. Lithium carbonate as commercially produced from mineral extraction, lithium-containing brines or sea water, in aqueous solution is used as a feedstock and reacted with carbon dioxide under pressure to form dissolved lithium bicarbonate. Impurities in the lithium carbonate feedstock are either solubilized or precipitated out. Dissolved impurities are physically separated from the lithium bicarbonate using an ion selective means, such as an ion exchange material, or by liquid--liquid extraction. Purified lithium carbonate is then precipitated.Other References
Field of SearchLithiumIon exchanging or liquid-liquid extracting Alkali metal containing (Li, Na, K, Rb, or Cs) Ion exchanging or liquid-liquid extracting Ion exchanging or liquid-liquid extracting Including cation Calcium or magnesium (e.g., hardness, water softening, etc.) Anions Removing ions Heavy metal |
| ||||||||||||||
