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GATE 2023 MT – Question 49

Mineral Processing and Extractive Metallurgy · Non-ferrous extraction · 2 marks · Multiple select

Identify the INCORRECT statement(s)

  1. Calcination is typically exothermic and roasting is usually endothermic.
  2. Coking of coal is carried out in a shaft furnace.
  3. The aims of extractive metallurgy processing are separation, compound formation, metal production, and metal purification.
  4. The secondary steelmaking offers steel cleanliness, composition adjustments, and temperature adjustments.

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Show answer and explanation

Correct answer: (A) Calcination is typically exothermic and roasting is usually endothermic.; (B) Coking of coal is carried out in a shaft furnace.

Explanation

Calcination is usually endothermic, while sulfide roasting is commonly exothermic, so A reverses the usual trend. Coking is carried out in coke ovens, making the shaft-furnace claim B incorrect. The processing objectives and secondary-steelmaking functions in C/D are valid.

Thus **A,B** are the requested incorrect statements.