Abstract
Electrochemical and flotation studies were conducted on Inco matte, composed of chalcocite (Cc), heazelwoodite (Hz) and Cu- Ni alloy. After magnetic removal of the alloy, the Cc is floated using diphenyl guanidine. There is some flotation of heazelwoodite due to inadvertent activation by Cu ions. This was investigated by rest potential measurements on matte components and mild steel, detection of Cu ions by EDTA extraction, and flotation. Rest potentials at pH 11.9 showed the order: Cc>mild steel>Cu-Ni alloy>Hz. Along with Cc, the Cu- Ni alloy is potentially galvanically active, releasing Cu ions. Sodium dithionite proved the most effective, reducing the rest potential and Cu ion release. Subsequent flotation, however, required aeration to restore Cc floatability. The need for aeration is compatible with the proposed surface product formed by reaction between Cu and DPG.
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