Roasting of mixed sulphide ores or concentrates
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United States of America Patent
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Oct 23, 1984
Grant Date -
N/A
app pub date -
Mar 3, 1983
filing date -
Mar 3, 1983
priority date (Note) -
Expired
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Abstract
In the roasting (oxidation) of mixed zinc sulphide/lead sulphide concentrates, to give an oxidic product for reduction, improved sulphur elimination and reduced lead volatilization are achieved by mixing 2-20% by weight of zinc oxide with the mixed sulphide materials, forming pellets of 2-15 mm diameter and roasting these under controlled oxidation conditions, firstly at a lower temperature and then at a higher temperature; preferably at 850.degree.-950.degree. C. for the first stage and at 950.degree.-1050.degree. C. for the last stage.
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