A partial desulfurization roasting process has been tested on a a typical copper-zinc sulfide concentrate in a Nichols Herreshoff monoheath pilot furnace whereby the sulfur is partially removed and iron is to a certain degree preferentially oxidized. The phase changes that occur in the particles during selective roasting at 650 deg C and 800 deg C over a range of residence times were investigated by the use of chemical analysis, optical microscopy, X-ray diffraction and electron microprobe analyses. The purpose f this work was to get an insight into the mineral assemblages formed by controlled oxidation roasting and to evaluate if this non traditional approach could be afterwards used to recover zinc, copper and iron by a physical separation method.
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