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GATE 2022 MT – Question 19

Mineral Processing and Extractive Metallurgy · Primary and secondary steelmaking · 1 mark · Multiple choice

Which one of the following elements has the slowest removal rate from hot metal in basic oxygen furnace (BOF) steelmaking?

  1. Carbon
  2. Sulfur
  3. Silicon
  4. Phosphorus

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Show answer and explanation

Correct answer: (B) Sulfur

Explanation

The oxidizing BOF environment efficiently removes silicon, carbon and phosphorus, but is unfavorable for deep desulfurization, which benefits from basic reducing slag.

Thus **sulfur, B** is slowest removed.