Abstract: Continuous process for the purification of zinc plant electrolyte employing copper arsenate for the removal of cobalt and associated impurities in a four-step treatment comprising:(1) cementation of copper with fine zinc dust,(2) precipitation of the major portion of cobalt by the addition of coarse zinc dust, dilute sulfuric acid and copper arsenate,(3) further addition of coarse zinc dust and dilute acid to precipitate more cobalt and reduce the cobalt level in said electrolyte to about 1.0 ppm, and(4) further addition of coarse zinc dust and dilute acid to reduce the cobalt level in said electrolyte to less than about 0.1 ppm.

Abstract: A process for treating zinc plant leach residues for the recovery of the lead, silver, and tin values contained therein is disclosed. The process includes the treatment of the zinc plant residue with concentrated sulphuric acid followed by water leaching and other hydrometallurgical steps to separately recover the lead, silver and tin.

Abstract: A system for stripping electrolytically deposited zinc from relatively small size cathode sheets having a submerged or zinc plating area of approximately one square meter. A frame member is provided for supporting the cathode sheet holding arms which are mounted so as to permit the adjacently spaced sheets to move with respect to one another sufficient to facilitate mechanical stripping of the sheets. A water supply is further provided in the frame for washing the sheets prior to stripping. Once stripped, the sheet is lowered onto a conveyor which removes the zinc sheet from the frame area and stacks it adjacent one end of the frame.

Abstract: Hydrometallurgical process for the recovery of copper arsenate from zinc plant cement copper residues and the use thereof in the purification of zinc electrolyte, with the attendant upgrading of the copper value in the treated cement copper residues.