SEPARATION OF COPPER AND CALCIUM FROM COBALT AQUEOUS SOLUTION

摘要

PROBLEM TO BE SOLVED: To easily produce an aq. soln. of Co of a high purity by adding a mixture of bis (2-ethylhexyl) phosphoric acid and an oxime series extracting agent to an aq. soln. of Co contg. Cu and Ca as impurities and extracting and separating Cu and Ca into organic phases. SOLUTION: An aq. soln. of cobalt chloride contg. Cu and Ca as impurities is added and mixed with a mixed extracting agent of bis (2-ethylhexyl) phosphoric acid as an extracting and separating agent for Ca and an oxime series extracting agent as an extracting and separating agent for Cu in the ratio of 1 to 50vol.%, and they are shaked and mixed at a room temp. to 60 deg.C and are brought into reaction with. In this case, for regulating the pH value of the aq. soln. to prescribed value, NaOH is used as a neutralizer. The Co-contg. aq. soln. with high purity in which Cu and Ca are extracted and separated in the obtd. organic phases and extremely small in the contents of Cu and Ca as impurities can be obtd. at a high Co yield.