Tianqi Lithium Corporation

Australia

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C01D 15/08 - CarbonatesBicarbonates 1
C01D 7/06 - Preparation via sodium or potassium magnesium carbonate 1
C22B 3/04 - Extraction of metal compounds from ores or concentrates by wet processes by leaching 1
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PROCESS FOR THE PRODUCTION OF LITHIUM CARBONATE

      
Document Number 02786317
Status In Force
Filing Date 2010-11-19
Grant Date 2020-07-07
Owner TIANQI LITHIUM CORPORATION (Australia)
Inventor Tan, Ignatius Kim Seng

Abstract

A process for the production of lithium carbonate is provided, including the steps of calcining alpha-spodumene to produce beta-spodumene, sulphating the beta-spodumene and passing it to a leach step in which lithium sulphate is leached in water to produce a pregnant leach slurry, removing impurities from the pregnant leach slurry and precipitating calcium carbonate therefrom, passing the pregnant leach slurry to an ion exchange step to remove residual calcium, magnesium, iron and aluminum, and then adding sodium carbonate to the pregnant leach slurry to produce lithium carbonate slurry and a sodium sulphate mother liquor. The lithium carbonate slurry can then be digested with carbon dioxide and subsequently decomposed and crystallised to produce lithium carbonate.

IPC Classes  ?

  • C01D 7/06 - Preparation via sodium or potassium magnesium carbonate
  • C01D 15/08 - CarbonatesBicarbonates
  • C22B 3/04 - Extraction of metal compounds from ores or concentrates by wet processes by leaching