APPLICATION OF CYANEX272 TO Co/Ni SEPARATION

In order to completely separate cobalt from nickel,the process of cobalt extraction with Cyanex272 in solution derived from cobalt residue acid dissolving is investigated,and a commercial application is also described The cobalt extraction recovery is 98% with 3 min mixing time,and Co 2+ in solution reduces to 0 01g/L from 4 5g/L;the ratio of 〔Co〕/〔Ni〕 in the pregnant organic phase is up to 529 20 after 3 stages scrubbing The cobalt extractive recovery is over 99% by 3 stages extraction and scrubbing,the β Co/Ni is up to 2 50×10 5 The Co 2+ content in organic phase is below 0 020g/L with 2 stages stripping The C1 - content in refresh organic phase is eliminated completely by 2 stages scrubbing with deionized water,without accumulation in nickel electrolyte The cobalt extraction is not affected by calcium and magnesium existing in the solution In the commercial application,the A grade cobalt oxide is produced,and nickel sulfate solution meets the needs of A grade cathode nickel production by electrolysis