Flotation of copper residues with high oxidation and combination ratios

摘要

Sulphidising flotation was employed to successfully recover copper residues with high oxidation and combination ratios and the main components of the mineral chrysocolla (CuSiO_3). Sodium sulphide (Na_2S), ammonium sulphate ((NH_4)_2SO_4) and ethylenediamine phosphate were used as the sulphidising agent, sulphidising accelerator and the activator, respectively. The proper dosage ratio of Na_2S to (NH_4)_2SO_4 was determined for optimal sulfidisation effect, and the effect of pulp pH on the sulphidising flotation was investigated. Meanwhile, the collaborated collecting action of two hydroximic acids was studied. From the close circuit test, copper concentrate with a grade of 11.82% and a recovery of 59.60% was obtained.