CH4-BF-gpoe

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What is the primary purpose of coke in a blast furnace?

To enable the construction of large size blast furnaces (correct)

To provide iron to the hot metal

To reduce the atmosphere in the furnace

To facilitate the counter current heat and mass exchange

Which of the following raw materials is not typically used in the production of pig iron in India?

Limestone

Coal dust

Bauxite (correct)

Scrap iron

What is the primary benefit of the counter current nature of the reactions in a blast furnace?

It enables the use of high strength coke

It increases the efficiency of the reduction process (correct)

It increases the production of pig iron

It reduces the quality of the iron ore used

What is the primary function of iron ore in a blast furnace?

To provide iron to the hot metal Signup and view all the answers

Which of the following is NOT a form of iron ore?

Silicate Signup and view all the answers

What is the name of the iron oxide form commonly used in SAIL plants?

Hematite Signup and view all the answers

What is the primary advantage of using pellets in a blast furnace?

They reduce the consumption of coke Signup and view all the answers

Which of the following is a potential use of coal dust in a blast furnace?

To increase the heat transfer in the furnace Signup and view all the answers

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 Signup and view all the answers

What is the benefit of utilizing scrap iron in blast furnaces?

It reduces the production cost and increases the furnace's productivity Signup and view all the answers

What is the primary function of sinter in the blast furnace?

To provide the extra lime required for the iron ore and coke ash Signup and view all the answers

What is the process of agglomeration of fines in sinter production?

Incipient fusion caused by heat available from the coke Signup and view all the answers

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 Signup and view all the answers

What is the effect of coal dust injection on coke consumption in blast furnaces?

It reduces the coke consumption Signup and view all the answers

What is the characteristic of Indian coal that affects its use in coke production?

High ash content and poor coke strength Signup and view all the answers

What is the consequence of rapid fluctuation in moisture content of Indian coal?

It leads to excessive generation of fines Signup and view all the answers

What is the primary location where coal is injected in the process?

Through the tuyeres Signup and view all the answers

What is the minimum percentage of iron in iron ore lumps as per the specified chemical analysis?

61.0% min Signup and view all the answers

What is the purpose of using limestone in the process?

To facilitate the slag formation in the blast furnace Signup and view all the answers

What is the ideal range of Coke Reactivity Index (CRI) for the coke used in the process?

21-23 Signup and view all the answers

What is the primary purpose of sinter production in the process?

To enhance the combustion efficiency in the blast furnace Signup and view all the answers

What is the minimum percentage of Fe in iron ore as per the specified chemical analysis?

50-58% Signup and view all the answers

What is the primary benefit of using coal dust injection in the process?

To enhance the combustion efficiency in the blast furnace Signup and view all the answers

What is the ideal range of softening and melting point for the coke used in the process?

1200-1450oC Signup and view all the answers

What is the primary function of limestone in the blast furnace?

Acting as a flux to reduce the melting point of gangue Signup and view all the answers

What is the approximate silica content in quartzite?

96-97% Signup and view all the answers

What is the role of manganese ore in the blast furnace?

Acting as an additive to supply manganese to the hot metal Signup and view all the answers

What is the primary function of coke in the blast furnace?

Acting as a reductant and fuel to support the burden Signup and view all the answers

What is the typical iron content in the iron ore used in the blast furnace?

62-66% Signup and view all the answers

What is the purpose of using LD slag in the blast furnace?

As a substitute for limestone to reduce waste and production cost Signup and view all the answers

What is the effect of high alumina content in the slag?

It makes the slag highly viscous Signup and view all the answers

What is the role of quartzite in the blast furnace?

Counteracting the bad effects of high alumina in the slag Signup and view all the answers

What is the typical manganese content in the manganese ore used in the blast furnace?

28-32% Signup and view all the answers

What is the characteristic of the iron ore used in the blast furnace?

Relatively free from impurities like phosphorous, sulphur, and copper Signup and view all the answers

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