Process for producing high purity lithium carbonate
Patent 4207297 Issued on June 10, 1980. Estimated Expiration Date: 
March 27, 1998. 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.
March 27, 1998. 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 2413644 2940820 3007771 InventorsAssigneeApplicationNo. 05/890328 filed on 03/27/1978US Classes:423/179.5, Lithium423/421, Alkali metal containing (Li, Na, K, Rb, or Cs)423/641Alkali metal (Li, Na, K, Rb, or Cs)ExaminersPrimary: Gantz, Delbert E.Assistant: Straub, Gary P. Attorney, Agent or FirmInternational ClassesC01D 15/00 (20060101)C01D 15/02 (20060101) C01D 15/08 (20060101) AbstractA continuous integrated process for the production of lithium hyroxide monohydrate and high purity lithium carbonate of large average particle size comprising converting impure lithium carbonate to lithium hydroxide by a causticization step, separating precipitated calcium carbonate from the resulting lithium hydroxide solution, precipitating lithium hydroxide monohydrate from a major portion of the lithium hydroxide solution and recovering same, introducing carbon dioxide or lithium carbonate to the remaining minor portion of the lithium hydroxide solution to precipitate additional calcium as calcium carbonate, separating the precipitated calcium carbonate from the lithium hydroxide solution, introducing carbon dioxide to the lithium hydroxide solution to precipitate high purity lithium carbonate of large average particle size, separating and recovering said lithium carbonate from the resulting lithium carbonate solution, and recycling said lithium carbonate solution to said causticization step.Other References
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