Sponge iron contains . . . . . . . .
A. more than three per cent phosphorous
B. more than three per cent silicon
C. very high percentage of manganese (>4 %)
D. little amount of slag
Answer: Option D
This Question Belongs to Metallurgical Engineering >> Iron Making In Metallurgy
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
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