Removal of boron from lithium chloride brine
Patent 4261960 Issued on April 14, 1981. Estimated Expiration Date: 
April 11, 1999. 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.
April 11, 1999. 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 3268289 3342548 InventorAssigneeApplicationNo. 06/028975 filed on 04/11/1979US Classes:423/179.5, Lithium159/903, Solar23/298, From natural sources423/158, Forming insoluble substance in liquid423/164, Hydroxylating or hydrating423/166SulfatingExaminersPrimary: Vertiz, O. R.Assistant: Langel, Wayne A. Attorney, Agent or FirmInternational ClassesC01D 15/00 (20060101)C01D 15/04 (20060101) AbstractBoron, as well as magnesium and sulfate impurities, are removed from or at least substantially reduced in a lithium containing brine to minimize lithium losses on further concentration of the brine by adding to the brine an aqueous slurry of slaked lime and a solution of calcium chloride to form a calcium borate hydrate, magnesium hydroxide and calcium sulfate dihydrate, the last named compound being precipitated and separated from the brine. On further concentration of the brine, calcium boron hydrate and magnesium hydroxide precipitate and they are also removed from the brine. In an alternate procedure, the pH of the brine is adjusted to 8.0-8.4 by addition of hydrochloric acid to form a calcium borate hydrate, which on further evaporation, is also separated from the brine. The brine is then concentrated further to recover lithium values.Other References
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