The deadman's zone in the blast furnace consists of
A. closely packed central columm of coke, limestone and iron ore
B. gases only
C. closely packed central column of coke only
D. column of hot metal and slag
Answer: Option B
Solution (By Examveda Team)
The deadman's zone in a blast furnace refers to the central region at the bottom of the furnace where the burden materials slow down and become relatively stagnant.This zone is composed primarily of a closely packed column of coke that remains largely stationary while the surrounding materials continue to descend.
The coke in this region supports the overlying burden and provides permeability for the upward flow of gases.
It is called the "deadman" because of its limited movement compared to other parts of the furnace burden.
Therefore, Option C is correct as the deadman zone consists mainly of coke only.
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
Correct answer is option C.