Recovery of lithium compounds from brines

  • US 6,207,126 B1
  • Filed: 07/14/1999
  • Issued: 03/27/2001
  • Est. Priority Date: 07/16/1998
  • Status: Expired due to Term
First Claim
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1. A process for the direct recovery of lithium chloride from brine comprising:

  • preparing a brine containing about 6.0 wt % lithium, and further containing magnesium, calcium and sulfate;

    adding CaO or Ca(OH)2 to the brine to coprecipitate magnesium and calcium;

    adding oxalate to remove remaining calcium by precipitating calcium oxalate;

    adding barium to remove sulfate by precipitating barium sulfate;

    adjusting the final pH of the brine to about 7.0 to precipitate lithium chloride.

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