This set of Iron Making Multiple Choice Questions & Answers (MCQs) focuses on “Blast Furnace Reactions and Process in Nutshell”.
1. Which of the following materials are used as refractory in Blast furnace?
a) Bismuth made materials
b) Lead material
c) Cadmium made materials
d) Fireclay bricks
View Answer
Explanation: Fireclay bricks are used as refractories in blast furnace. Fireclay bricks are composed from a blend of usually two or more clays. The other options are completely of low melting points which cannot withstand the temperature of Blast furnace.
2. What is temperature of pre heated air blown through Tuyeres?
a) 600-700 degree centigrade
b) 450-650 degree centigrade
c) 900-950 degree centigrade
d) 1000-1100 degree centigrade
View Answer
Explanation: The air is preheated before the blowing operation. The preheating is done to reduce the fuel consumption. Air is preheated to a temperature of 1000-1100 degree centigrade in which oxygen and moisture are mixed.
3. What is the highest temperature obtained in furnace?
a) 1400-1600 degree centigrade
b) 1200-1300 degree centigrade
c) 2500-3500 degree centigrade
d) 1900-2000 degree centigrade
View Answer
Explanation: The highest temperature obtained in blast furnace is at tuyere zone. At tuyere zone the preheated air is blown which provides more heat. The reaction of oxygen from air with coke produces carbon monoxide which produces more heat at this zone.
4. What is the sequence of reduction of ore in blast furnace?
a) Heamitite-magnetite-wustite-iron
b) Magnetite- heamitite-wustite-iron
c) Heamitite-magnetite-iron-wustite
d) Heamitite-wustite-magnetite-iron
View Answer
Explanation: In blast furnace the reduction of starts with reduction of heamitite with carbon monoxide. The former reduction produces magnetite. Then magnetite is converted to wustite followed by reduction forms iron.
5. Blast furnace gas expels out of the furnace from_____________
a) Bottom of the furnace
b) Top of the furnace
c) Tuyere zone of the furnace
d) No gas expels out of furnace
View Answer
Explanation: The Blast furnace gas consists of carbon monoxide, nitrogen and carbon dioxide. This gas expels out from the top of the furnace. The Tuyere gas move upwards during its chemical reaction with burden produces blast furnace gas.
6. Slag from Blast Furnace comes out because of__________
a) Chemical combination of magnesite
b) Gasification of carbon
c) Dissociation of calcium carbonate
d) Reduction by Carbon monoxide
View Answer
Explanation: Dissociation of calcium carbonate produces quick lime and carbon dioxide. This quick lime facilitates the removal of inclusions in the burden. Thus slag is produced due to the reaction of quick lime with inclusions.
7. The tapping of hot metal from blast furnace is done at________
a) Tap notch
b) Slag hole
c) Tuyere zone
d) Bosh
View Answer
Explanation: Tapping of hot metal is carried at the Hearth zone. Through tap notch the hot metal is tapped out of the furnace. The tapped metal is collected by ladles whereas slag is tapped at slag hole.
8. Coke contained in blast furnace starts melting at____________
a) Stack
b) Hearth
c) Belly
d) Tuyere
View Answer
Explanation: Coke does not start melting at Stack zone. The air blown through tuyere is what reacts with coke. This reaction of coke with oxygen in tuyeres is what produces carbon monoxide and makes coke to melt.
9. Which of the following reaction is called as Boudouard reaction?
a) 2CO ⇌ CO2 + C
b) C(s) + CO2(g) → 2 CO
c) C + O2 → CO2
d) C + H2O → CO + H2
View Answer
Explanation: Boudouard reaction is the temperature-dependent equilibrium controlling the gas atmosphere in the furnace. The Carbon monoxide is converted into carbon dioxide for more heat production. Boudouard reaction is reversible.
10. What is the carbon percentage present in Pig iron produced in blast furnace?
a) 1-2 %
b) 0.05-0.25%
c) 0.25-0.59%
d) 4-5%
View Answer
Explanation: Pig iron produced in blast furnace is brittle in nature. This pig iron consists of high carbon content (4-5%). Pig iron produced by blast furnace on further processing produces various grades of steel.
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