Abstract
This study investigates the influence of Na2S, CuSO4 and FeCl3 on sulphidizing floatation of copper in copper smelting slag. The results show that copper has a good floatability, independent of the addition of Na2S and Cu2 + ions, while Fe3+ inhibits the floatation. In the pH range between 2 and 4, in conditions with Na2S and Cu2 + ions addition, the recovery rate of metal copper rapidly increased and maintained the high level. But the inhibition effect of Fe3+ was enhanced with the increasing of the concentration. Further analysis shows that the Cu2+ and Fe3+ both enhance the surface potential, but with addition of Na2S, Fe3+ and Cu2+ get an opposite effect. Sodium sulfide would formed polysulfide, Monosulfides and polysulfides on solid surface. The addition of Cu2+ would not increase the adsorption amount of S2p on Cu surface and Fe3+ would not only oxidized sulfur ions thus reduce the adsorption and change the valence state of sulfur, but also oxidized metallic copper.
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