Studies on Electrolytic Refining of Zinc. V : Removal of Lead from Zinc Sulfate Solution with Xanthate or Tetramethyl Thiuramdisulfide

Lead in zinc sulfate solution can be effectively removed with K-isoamyl xanthate or tetramethyl thiuramdisulfide. To obtain the desired results, these reagents of which concentrations are 0.5% aqueous solution of K-isoamyl xanthate or ammoniacal and 1% aqueous solution of tetramethyl thiuramdisulfide, must be added to the neutral zinc solution (pH 4.8), stirring vigorously at about 40℃. Resultant zinc sulfate solution under best conditions contains only lead of 0.1 mg/1 in the case of K-isoamyl xanthate and 0.2-0.3 mg/1 in the case of tetramethyl thiuramdisulfide, provided that reagents as ten times as the equivalence of lead are added