34 Questions
What is the primary purpose of coke in a blast furnace?
To enable the construction of large size blast furnaces
Which of the following raw materials is not typically used in the production of pig iron in India?
Bauxite
What is the primary benefit of the counter current nature of the reactions in a blast furnace?
It increases the efficiency of the reduction process
What is the primary function of iron ore in a blast furnace?
To provide iron to the hot metal
Which of the following is NOT a form of iron ore?
Silicate
What is the name of the iron oxide form commonly used in SAIL plants?
Hematite
What is the primary advantage of using pellets in a blast furnace?
They reduce the consumption of coke
Which of the following is a potential use of coal dust in a blast furnace?
To increase the heat transfer in the furnace
What is the primary purpose of adding imported coal to the indigenous coal blend in coke production?
To improve the coke strength and reduce fines generation
What is the benefit of utilizing scrap iron in blast furnaces?
It reduces the production cost and increases the furnace's productivity
What is the primary function of sinter in the blast furnace?
To provide the extra lime required for the iron ore and coke ash
What is the process of agglomeration of fines in sinter production?
Incipient fusion caused by heat available from the coke
What is the purpose of pellet manufacturing in the context of blast furnace operation?
To utilize the micro-fines that cannot be used for sinter making
What is the effect of coal dust injection on coke consumption in blast furnaces?
It reduces the coke consumption
What is the characteristic of Indian coal that affects its use in coke production?
High ash content and poor coke strength
What is the consequence of rapid fluctuation in moisture content of Indian coal?
It leads to excessive generation of fines
What is the primary location where coal is injected in the process?
Through the tuyeres
What is the minimum percentage of iron in iron ore lumps as per the specified chemical analysis?
61.0% min
What is the purpose of using limestone in the process?
To facilitate the slag formation in the blast furnace
What is the ideal range of Coke Reactivity Index (CRI) for the coke used in the process?
21-23
What is the primary purpose of sinter production in the process?
To enhance the combustion efficiency in the blast furnace
What is the minimum percentage of Fe in iron ore as per the specified chemical analysis?
50-58%
What is the primary benefit of using coal dust injection in the process?
To enhance the combustion efficiency in the blast furnace
What is the ideal range of softening and melting point for the coke used in the process?
1200-1450oC
What is the primary function of limestone in the blast furnace?
Acting as a flux to reduce the melting point of gangue
What is the approximate silica content in quartzite?
96-97%
What is the role of manganese ore in the blast furnace?
Acting as an additive to supply manganese to the hot metal
What is the primary function of coke in the blast furnace?
Acting as a reductant and fuel to support the burden
What is the typical iron content in the iron ore used in the blast furnace?
62-66%
What is the purpose of using LD slag in the blast furnace?
As a substitute for limestone to reduce waste and production cost
What is the effect of high alumina content in the slag?
It makes the slag highly viscous
What is the role of quartzite in the blast furnace?
Counteracting the bad effects of high alumina in the slag
What is the typical manganese content in the manganese ore used in the blast furnace?
28-32%
What is the characteristic of the iron ore used in the blast furnace?
Relatively free from impurities like phosphorous, sulphur, and copper
This quiz covers the different sources of raw materials used in the production of iron ore. It includes various locations in India and imported sources. Test your knowledge of the iron ore industry!
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