The gas which smells like
that of rotten eggs is H2S. Hence, the ore is a sulphide ore. It is
concentrated by froth-floatation process. The metal is obtained from the
concentrated ore in the following two steps:
Heating the ore strongly in the presence of air. The metal sulphide is
converted into metal oxide along with evolution of sulphur dioxide gas.
sulphide + O2 Metal
oxide + SO2
Reduction with carbon; On heating the metal oxide with carbon, it is reduced to
+ CarbonMetal + Carbon monoxide
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