The GATE Grind

GATE 2024 MT – Question 47

Mineral Processing and Extractive Metallurgy · Ironmaking · 2 marks · Multiple select

Which of the following statements is/are correct?

  1. Ultimate analysis of coal involves determination of moisture, volatile matter, fixed carbon and ash.
  2. Reduction of wustite in blast furnace occurs at the lower part of the stack.
  3. Roasting involves reduction of sulfide ores to pure metals.
  4. White metal (impure Cu2S) is produced by oxidizing Fe and S during smelting of Cu-Fe matte.

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Correct answer: (B) Reduction of wustite in blast furnace occurs at the lower part of the stack.; (D) White metal (impure Cu2S) is produced by oxidizing Fe and S during smelting of Cu-Fe matte.

Explanation

Moisture/volatiles/fixed carbon/ash belong to proximate, not ultimate analysis.

Wustite reduction occurs in the lower stack, so B is true.

Roasting is oxidative treatment rather than direct reduction to pure metal.

Oxidizing Fe and S from copper–iron matte yields Cu2S-rich white metal, so D is true. **B,D**.