why is zinc blende ore is roasted before carbon reduction?
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Extraction of Zinc : The zinc is extracted from its ore zinc blende (ZnS). ... The concentrated ore is then roasted in presence of excess of air at 1200 K. If roasting is carried out below this temperature, ZnS is converted into ZnSO4, which convert back to ZnS during carbon reduction of roasted ore.
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in order to convert it into its oxide form
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