MetallurgyHard
Question
Process of heating ore in air to remove sulphur is :
Options
A.calcination
B.roasting
C.smelting
D.none of these
Solution
Roasting is a process of heating the concentrated ore (generally sulphide ore) strongly in the excess of air or O2 below its melting point. During roasting impurities of As, Sb, P and S escape as their volatile oxides.
S (s) + O2 (g) → SO2 (g)
S (s) + O2 (g) → SO2 (g)
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