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
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Comments (2)
purpose of flux in blast furnace
A. bring down the softening point of the gangue materials
B. reduce the viscosity of the slag
C. to maintain proper basicity
D. all of these
High top pressure in the blast furnace
A. decreases the time of contact between gas and solid
B. increases the time of contact between gas and solid
C. increases fuel consumption
D. increases the rate of solution loss reaction
Dephosphorisation of molten pig iron is favoured by
A. oxidising and basic slag
B. reducing and basic slag
C. high activity co-efficient of phosphorous in metal
D. oxidising and neutral slag
High top pressure in a blast furnace operation
A. favours the solution loss reaction
B. suppresses the solution loss reaction
C. decreases gas-solid contact time
D. increases coke rate
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