Recovery of metals from zinc prodn. residues - by treatment, with a dil. acid and an immiscible organic phase, solvent extraction of the aq. phase, etc.

摘要

The residues are treated with a mixt. of acidified water at pH2 and an organic phase consisting of a selective cationic agent and a paraffinic diluent. After the attack, the aq. phase is adjusted to pH 1.9, and the metals recovered by solvent extraction, while lead and silver remain in the residue. Soluble metals can be recovered by electrolysis, as salts by evaporation and crystallisation, or as insoluble pptes. by chemical pptn. The zinc remains in the organic phase, from which it is recovered in usual manner.