Abstract
Quenched copper-containing samples of silica-saturated iron silicate slag were subjected to X-ray photoelectron spectroscopy (XPS) in an attempt to distinguish oxidic and sulfidic copper dissolved in slag as a function of sulfur partial pressure in the gas phase. First, slag and matte samples obtained by smelting industrial copper concentrate under controlled oxygen and sulfur potentials at 1,573 K are studied. Subsequently, synthetic SiO2-saturated iron silicate slags containing a small amount of copper equilibrated with different sulfur potential gases are subjected to XPS study. Oxygen and sulfur potentials were similar to those encountered in the industrial pyrometallurgical extraction of copper. The oxygen partial pressure was maintained constant at 10-3 Pa with different sulfur pressure from 0 to 3.5 - 102 Pa. The XPS Cu 2p3/2 and Cu L3M45M45 Auger spectra for copper contained in slag were reported. The presence of Cu2O dissolved in slag was identified. The increase of sulfur pressure in the gas, hence the increased sulfur dissolution in slag, does not result in a consistent core-peak shift to cuprous sulfide species in the slag. The sulfide capacities have been also determined.
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