MetallurgyHard
Question
In roasting :
Options
A.moisture is removed.
B.non-metals as their volatile oxide are removed.
C.ore becomes porous.
D.all the above.
Solution
Roasting removes easily oxidisable volatile impurities like arsenic (as As2O3) sulphur (as SO2), phosphorus (as P4O10) and antimony (as Sb2O3).
4M (M = As, Sb) + 3O2 → 2M2O3 ↑
S + O2 → SO2 ↑ ; P4 + 4O2 → P4O10 ↑
Organic matter, moisture if present in the ore, also get expelled and the ore becomes porous.
4M (M = As, Sb) + 3O2 → 2M2O3 ↑
S + O2 → SO2 ↑ ; P4 + 4O2 → P4O10 ↑
Organic matter, moisture if present in the ore, also get expelled and the ore becomes porous.
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