Method of making high purity lithium hydroxide and hydrochloric acid

Method of making high purity lithium hydroxide and hydrochloric acid

  • CN 102,016,123 A
  • Filed: 04/09/2009
  • Published: 04/13/2011
  • Est. Priority Date: 04/22/2008
  • Status: Active Application
First Claim
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1. manufacture order water lithium hydroxide crystalline method may further comprise the steps:

  • (a) bittern that will contain lithium and sodium and contain potassium alternatively concentrates, so that sodium and potassium is precipitated from described bittern;

    (b) alternatively with described bittern purifying, to remove or to reduce the concentration of boron, magnesium, calcium, vitriol and any remaining sodium or potassium;

    (c) the pH value with described bittern is adjusted to about 10.5 to 11 with further removal lithiumAny positively charged ion in addition;

    (d) being further purified described bittern by ion-exchange is reduced to below the 150ppb with the total concn with calcium and magnesium;

    (e) with described bittern electrolysis to produce the wherein lithium hydroxide solution of total concn below 150ppb of calcium and magnesium, wherein contain by product chlorine and hydrogen;

    And(f) described lithium hydroxide solution is concentrated and crystallization to generate the monohydrate lithium hydroxide crystal.

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