Question:
Roasting is not necessary for:
Roasting is not necessary for:
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Roasting is mainly required for sulphide-rich low-grade ores.
Updated On: Jun 29, 2026
- Low Cu, high FeS concentrates
- High grade Cu concentrates (>30% Cu)
- Loss of copper from concentrate
- Elimination of sulphur from FeS-rich concentrates
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The Correct Option is B
Solution and Explanation
Concept:
Roasting is a pyrometallurgical process used to:
- oxidize sulphides
- remove sulphur as SO$_2$
- prepare ore for smelting
Reaction:
\[
2CuFeS_2 + O_2 \rightarrow Cu_2S + FeO + SO_2
\]
Step 1: Purpose of roasting.
Roasting is required when: - sulphur content is high - impurities must be oxidized
Step 2: High grade copper concentrates.
If Cu content is already high (>30%): - sulphur is relatively low - direct smelting is possible - roasting becomes unnecessary
Step 3: Evaluate options.
(A) needs roasting → false statement (B) high grade → roasting not necessary → correct (C) irrelevant statement (D) describes roasting purpose Final Answer: \[ \boxed{\text{High grade Cu concentrates (>30\% Cu)}} \]
Step 1: Purpose of roasting.
Roasting is required when: - sulphur content is high - impurities must be oxidized
Step 2: High grade copper concentrates.
If Cu content is already high (>30%): - sulphur is relatively low - direct smelting is possible - roasting becomes unnecessary
Step 3: Evaluate options.
(A) needs roasting → false statement (B) high grade → roasting not necessary → correct (C) irrelevant statement (D) describes roasting purpose Final Answer: \[ \boxed{\text{High grade Cu concentrates (>30\% Cu)}} \]
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