PROCESS FOR THE SEPARATION OF COBALT FROM THE SOLUTION OF A NICKEL(II) SALT

摘要

1316767 Basic Ni carbonates; removing Co from Ni solutions LE NICKEL 22 July 1970 [12 Aug 1969] 35412/70 Heading ClA A mixture of basic NiSPII/SP and NiSPIII/SP carbonates is produced by reacting a NiSPII/SP salt solution with an aqueous solution containing an alkali metal carbonate and an oxidizing alkali metal salt. The products have the formulµ respectively. The Ni salt may be sulphate, chloride or nitrate, and the oxidizing solution may contain Na 2 CO 3 and a persulphate, hypochlorite or hypobromite, preferably NaOCl. The reaction temperature may be 10-25‹ C. The product is used to remove CoSPII/SP as CoSPII/SP carbonate from NiSPII/SP solutions, e.g. sulphate, chloride, or nitrate, at 60-95‹ C. Excess Ni carbonate is used and the resulting ppt. used to treat further impure solution together with some fresh Ni carbonate; the resulting partially decobalted solution is then treated with excess fresh Ni carbonate and the cycle repeated.