A method for the recovery of pure copper and pure nickel from an oxime

摘要

In a process wherein copper and nickel are recovered separately from an oxime extractant by separate stripping and electrowinning steps, nickel concentration in the copper electrowinning step is maintained below about 10 g/l by directing a portion of a metal-barren acid stream from the copper electrowinning step to the nickel stripping step. Low copper concentration in the aqueous stream from the nickel stripping step to the nickel electrowinning step is effected by maintaining the mole ratio of exchangeable hydrogen ion of the acid to nickel ion of the oxime between 1.8 and 2.2 in the nickel stripping step in accordance with the equation: