The production technology of lithium hydroxide

The production technology of lithium hydroxide

  • CN 104,724,729 B
  • Filed: 12/23/2013
  • Issued: 03/19/2019
  • Est. Priority Date: 12/23/2013
  • Status: Active Grant
First Claim
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1. a kind of production technology of lithium hydroxide, which is characterized in that crystallize precipitation during lithium sulfate method production lithium hydroxideThe crystalline mother solution containing high concentration sodium sulfate and lithium hydroxide after sal glauberi is raw material, produces hydrogen-oxygen using following stepsChange lithium:

  • A, the separation of sodium sulphate and lithium hydroxideCrystalline mother solution is imported into nanofiltration film separation system, trapped fluid is the metabisulfite solution of concentration, and permeate is that lithium hydroxide is moltenLiquid;

    B, sulfate crystalMetabisulfite solution obtained by step A is cooled to -10-5 DEG C, is centrifugated, it is dry, obtain sal glauberi crystallization;

    OrAfter concentration, -10-5 DEG C are cooled to, is centrifugated, it is dry, obtain sal glauberi crystallization;

    C, Lithium hydroxide monohydrate crystallizesBy lithium hydroxide solution obtained by step A by evaporator concentration, enter back into after crystallizing tank continues concentration, through cooling, crystallization,Centrifuge separation, drying obtain Lithium hydroxide monohydrate crystallization;

    The nanofiltration membrane that the nanofiltration film separation system uses, the nanofiltration membrane are polyether sulfone, pH value >

    =14 that can be resistant to.

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