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.
Create a free account to view solution
View Solution FreeMore Metallurgy Questions
An ore after levigation is found to have acidic impurities. Which of the following can be used as flux during smelting o...Of the following the metals that cannot be obtained by electrolysis of the aqueous solution of their salts are :...Complexes formed in the cynide process are :...Parting of gold may be done with :...Blister copper is :...