What is the main purpose of coking coal?
A
To generate electricity
B
To produce gas for heating
C
To make coke for metallurgical processes
Analysis & Theory
Coking coal is used primarily in the metallurgical industry to produce coke, a key fuel and reducing agent in blast furnaces.
Coking is the process of:
B
Crushing coal into powder
C
Heating coal in the absence of air to produce coke
Analysis & Theory
Coking involves the destructive distillation of coal in the absence of air to produce coke.
Which type of coal is best suited for coking?
Analysis & Theory
Bituminous coal with specific properties is ideal for coking due to its volatile content and plasticity.
What is formed as a solid residue during coking?
Analysis & Theory
Coke is the carbon-rich solid residue left after coking coal is heated in the absence of air.
Which of the following is *not* a by-product of coking?
Analysis & Theory
Petroleum is obtained from crude oil, not from coal coking.
What is the role of coke in a blast furnace?
A
Acts as a fuel and reducing agent
D
Used to cool down the furnace
Analysis & Theory
Coke acts as both a high-temperature fuel and a reducing agent for iron ore in blast furnaces.
During coking, the volatile matter in coal:
B
Evaporates and forms by-products
C
Is converted to graphite
Analysis & Theory
Volatile matter evaporates and contributes to the formation of coal tar, coke oven gas, and ammoniacal liquor.
Which property is essential for coal to be coking coal?
C
Plasticity during heating
Analysis & Theory
Coking coal must soften, swell, and resolidify into a porous solid, which requires plasticity upon heating.
The temperature range used in the coking of coal is typically:
Analysis & Theory
Coking is usually carried out at high temperatures around 1000°C in coke ovens.
Which of the following processes produces metallurgical coke?
B
Carbonization of coal in coke oven
Analysis & Theory
Metallurgical coke is produced by carbonizing selected bituminous coal in coke ovens.