Answers

2016-01-28T11:54:26+05:30
Sulphide ores:
Roasting i.e. heating in presence of air to form oxides
carbonate ores:
calcination i.e. heating is absence of air 
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2016-01-30T03:05:39+05:30
For sulphide ores roasting and for carbonate ores calcenation
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