JNTU
JNTU B.Tech III IRON PRODUCTION Previous Question Paper (November/December - 2018 - R15)
Note: This question paper contains two parts A and B. Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks.
PART - A
List down the major iron ore deposits in India.
Answer
Major iron ore deposits in India are found in the Odisha-Jharkhand belt (hematite), the Durg-Bastar-Chandrapur region (Chhattisgarh and Maharashtra), the Bellary-Chitradurga-Chikkamagaluru-Tumakuru belt (Karnataka), and the Maharashtra-Goa belt.
Write the principles of sintering.
Answer
Sintering involves the agglomeration of fine iron ore particles into a porous, coherent mass by partial fusion. The process relies on the combustion of solid fuel (coke breeze) within the bed, creating high temperatures that cause surface melting and bonding of ore particles, while the suction of air through the bed promotes uniform heat distribution and oxidation.
Name the methods used to hoist the solid charge materials to the furnace top.
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What are the materials used for the furnace lining?
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Write the different types of pig iron production methods.
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How the physical factors affecting the reduction of ores?
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Classify the sponge iron making methods.
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Explain the term degree of metallization.
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Classify the smelt reduction methods.
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What are the difficulties in smelt reduction process?
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PART - B
List out the various factors for valuation of iron ores. What is the effect of Al2O3 in the ores?
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Explain the working principle of disc pelletiser with a neat sketch.
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Explain the production of green pellets with an appropriate example.
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Write short notes on theory of pellatisation.
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What is known as “Blast Furnace Productivity”? Explain some methods of increasing coke throughput.
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Why agglomeration of iron ore is useful in blast furnace iron making?
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Explain some factors affecting reducibility of iron ore in blast furnace iron making.
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Explain under what conditions of blast furnace burdening external desiliconisation is accomplished.
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Explain any one of the blast furnace reaction in detail.
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Discuss the CO/CO2 equilibrium diagrams in contact with iron oxides at various temperatures.
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An iron blast furnace produces pig iron of the following composition: Fe - 93.6%, Si - 2.1%, C - 3.6%, and Mn - 0.7%. The ore used analyzes as follows: Fe2O3 - 78%, SiO2 - 9%, Al2O3 - 5%, MnO - 1% and H2O - 7%. Assume that all the Fe2O3 is reduced to Fe. The coke is 90% C and 10% SiO2 and 1 ton of coke is used per ton of pig iron made. The flux is pure CaCO3 and enough is used to make a slag of 45% CaO. Calculate:
- a) The kilograms of ore used per ton of pig iron made.
- b) The percentage of the total SiO2 and of the MnO reduced in the furnace.
- c) The weight of slag made per ton of pig iron, and its percentage composition.
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Why rotary hearth furnace based DRI production is getting importance now a days?
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Discuss the physical chemistry of sponge iron making with suitable reactions.
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Explain the Kiln Krupp-Renn process of sponge iron production.
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Explain the advantages and disadvantages of HYL process of sponge iron production.
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Compare the plasma smelting process and COREX process.
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Write the advantages and disadvantages of ELRED process of smelting.
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What are the advantages of smelt reduction process?
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Write a short note on INRED process of smelt reduction.
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