| 摘要 |
<p>A process for purification of an aqueous solution of nickel sulfate containing cobalt and calcium which uses a multi-stage, countercurrent reaction tank system, wherein an aqueous solution of nickel sulfate is supplied as the aqueous phase to the last stage of the reaction tank system and a mixed organic solvent containing an extractant of 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester loading nickel, diluted with a hydrocarbon to an extractant concentration of 20 to 30% by volume, is supplied as the organic phase to the first stage of the reaction tank system, the aqueous phase being kept at a pH level of 4.5 to 5.5 in the last stage, and calcium concentration and totaled nickel, cobalt and calcium concentration in the organic phase being kept at 0.4g/L or less and 25g/L or less, respectively, in the last stage.</p> |
