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Preparation of lithium carbonate from waste lithium solution through precipitation and wet conversion methods

Hydrometallurgy, ISSN: 0304-386X, Vol: 210, Page: 105863
2022
  • 21
    Citations
  • 0
    Usage
  • 37
    Captures
  • 0
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    21
    • Citation Indexes
      20
    • Patent Family Citations
      1
      • Patent Families
        1
  • Captures
    37

Article Description

The recovery of lithium compounds from various Li resources is attracting attention due to the increased demand in the Li-ion battery (LIB) industry. This study aimed to secure lithium carbonate (Li 2 CO 3 ) using the waste Li solution generated from the cathode manufacturing process. The effects of initial Li + concentration, solution pH, and applied phosphate compounds were examined on converting Li-ion into lithium phosphate (Li 3 PO 4 ) by a precipitation method. Li 2 CO 3 was then obtained from Li 3 PO 4 by reflux and subsequent carbonation methods, in which a concentrated Li solution was produced from Li 3 PO 4 by reaction with metal chloride solutions. Among the tested metal chlorides (AlCl 3, MgCl 2, and CaCl 2 ), CaCl 2 showed the best performance to produce a concentrated Li solution. The highest conversion efficiency (97%) from Li 3 PO 4 to Li solution was observed at 80 °C, and the highest Li concentration (55,900 mg/L) was obtained at a solid(g)/liquid(L) ratio of 500 by reflux reaction. High purity Li 2 CO 3 was produced from the obtained Li solution by purification using sodium hydroxide, and its carbonation using sodium carbonate in turn. The proposed method shows an alternative way to secure Li 2 CO 3 from waste Li solution, in which no acid leaching of Li 3 PO 4 is required to prepare concentrated Li solution to be used Li 2 CO 3 production.

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