Investigation of silver extraction from a silver-sulphur flotation concentrate from the electrolytic zinc plant of Companhia Paraibuna de Metais, Juiz de Fora, Brazil

A silver-sulphur flotation concentrate produced from the hot acid leach residue in the electrolytic zinc plant of Companhia Paraibuna de Metais was investigated for hydro-metallurgical silver extraction. This concentrate assayed 8320 g/t Ag, 20.6% Pb, and 43.7% S. It consisted mainly of lead sulphate and elemental sulphur with numerous minor components. The form of the silver was not precisely established and several forms appeared to be present.