Basicity [defined as (%CaO + %MgO)/%SiO2] of the slag in the indian blast furnaces is in the range of
A. 0.7 - 1.0
B. 1.1 - 1.4
C. 1.5 - 1.8
D. 2.0 - 2.5
Answer: Option A
Solution(By Examveda Team)
In the context of iron making in metallurgy, basicity is defined as the ratio of the percentage of calcium oxide (%CaO) and magnesium oxide (%MgO) to the percentage of silicon dioxide (%SiO2) in the slag.The basicity of the slag is an important factor in the blast furnace process as it affects the melting point and fluidity of the slag, which, in turn, influences the efficiency of the iron-making process.
In Indian blast furnaces, the typical range of basicity is 0.7 to 1.0. This range ensures that the slag composition is suitable for the efficient extraction of iron from iron ore.
The other options do not accurately represent the typical basicity range for slag in Indian blast furnaces. Therefore, the correct answer is Option A: 0.7 - 1.0.
This Question Belongs to Metallurgical Engineering >> Iron Making In Metallurgy
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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
Please explain briefly