Desulfurisation of hot metal is favoured by
A. reducing and neutral slag
B. high activity co-efficient of sulphur in metal
C. oxidising and basic slag
D. reducing and basic slag
Answer: Option D
Solution (By Examveda Team)
Desulfurisation is the process of removing sulphur from hot metal (usually molten iron) to improve its quality.This process is favoured by a reducing atmosphere because an oxidising environment can lead to reversion of sulphur back into the metal.
A basic slag (rich in lime, CaO) reacts with sulphur to form calcium sulphide (CaS), which is stable and can be easily removed.
Thus, a reducing and basic slag environment promotes maximum sulphur removal by encouraging the formation and retention of CaS in the slag phase.
Therefore, Option D is the correct answer as it provides the most favourable conditions for desulfurisation.
This Question Belongs to Metallurgical Engineering >> Iron Making In Metallurgy
Wrong reducing and basic slag is favorable. Option D is correct.
Desulfurization of hot metal favoured by -
Reducing atmosphere & basic slag is the correct answer but why option c is correct