Process of producing high purity cobalt

  • US 5,667,665 A
  • Filed: 03/12/1996
  • Issued: 09/16/1997
  • Est. Priority Date: 03/14/1995
  • Status: Expired due to Fees
First Claim
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1. A process for producing a high purity cobalt comprising the steps of:

  • (a) preparing an aqueous solution of cobalt chloride having a hydrochloric acid concentration of 7 to 12N by dissolving a crude cobalt comprising Fe and Ni as impurities in an aqueous solution of hydrochloric acid at a temperature of 50°

    to 100°

    C.;

    (b) contacting the prepared aqueous solution of cobalt chloride with an anion exchange resin so that cobalt is adsorbed on the anion exchange resin together with Fe;

    (c) eluting the cobalt with hydrochloric acid as an eluting solution having a concentration of 1 to 6N to form an eluted cobalt solution while retaining Fe on the anion exchange resin;

    (d) vaporizing and drying or otherwise concentrating the eluted cobalt solution to provide a purified aqueous solution of cobalt chloride having a pH of 0 to 6; and

    (e) conducting electrolytic refining of cobalt in an electrolyte cell with said purified aqueous solution of cobalt chloride as an electrolyte and a crude cobalt as an anode to obtain electro-deposited cobalt.

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