Improvement for sulphidation roasting and its application to treat lead smelter slag and zinc recovery

The conventional sulphidation roasting process is usually accompanied by the emission of SO 2 , leading to serious environmental pollution. This study focuses on the decrease or elimination of the poisonous gas by introducing carbon to the system and its further application to zinc recovery from the...

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Bibliographic Details
Published in:Canadian metallurgical quarterly 2015-01, Vol.54 (1), p.92-100
Main Authors: Zheng, Y.-X., Liu, W., Qin, W.-Q., Han, J.-W., Yang, K., Luo, H.-L., Wang, D.-W.
Format: Article
Language:English
Subjects:
Carbon
Flotation
Lead smelter slag
Pyrometallurgy
Roasting
Slags
Smelters
Sodium carbonate
Sulphidation
Sulphidation roasting
Zinc
Zinc sulfides
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Summary:The conventional sulphidation roasting process is usually accompanied by the emission of SO 2 , leading to serious environmental pollution. This study focuses on the decrease or elimination of the poisonous gas by introducing carbon to the system and its further application to zinc recovery from the lead smelter slag. The effects of temperature, dosage of sodium carbonate, carbon powder and pyrite and time on the sulphidation extent of zinc were studied at a laboratory scale and the sulphidation extent reached 85·62% under the optimum conditions. The results confirmed that the novel improvement for the sulphidation roasting was feasible. Besides, it was found that adding sodium carbonate was favourable for the growth and aggregation of zinc sulphides grains in the slag. Flotation tests indicated that zinc sulphides produced could be separated from the treated slag and the zinc grade increased from 14·07 to 25·12% after one rougher flotation.
ISSN:0008-4433
1879-1395
DOI:10.1179/1879139514Y.0000000155