The GATE Grind

GATE 2026 MT – Question 25

Mineral Processing and Extractive Metallurgy · Non-ferrous extraction · 1 mark · Multiple choice

Which one of the following options is correct? Red mud is generated in the production of:

  1. Aluminium
  2. Iron
  3. Titanium
  4. Copper

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Show answer and explanation

Correct answer: (A) Aluminium

Explanation

In the Bayer process, caustic digestion selectively dissolves alumina-bearing components of bauxite. Insoluble iron-rich oxides and other impurities remain as the residue called red mud. Bayer alumina feeds aluminium production, so **aluminium, A** is the correct association.