JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech III NONFERROUS EXTRACTIVE METALLURGY Previous Question Paper (November/December - 2017 - 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 and may have a, b, c as sub questions.
Part A
Which chemical reaction should be avoided in Dow process?
Answer
In the Dow process for magnesium extraction, the reaction between magnesium metal and water vapor must be avoided:
What is chlorination of titania?
Answer
Chlorination of titania is a pyrometallurgical process used to extract titanium from its ore, typically ilmenite or rutile, by converting titanium dioxide (TiO2) into titanium tetrachloride (TiCl4). The process is carried out in a fluidized bed reactor at temperatures between 800°C and 1000°C.
The chemical reaction involves reacting the ore with chlorine gas in the presence of a reducing agent, usually petroleum coke:
The resulting TiCl4 is a volatile liquid that can be purified through fractional distillation, which is a critical step in producing high-purity titanium metal via the Kroll process or for manufacturing titanium dioxide pigments via the chloride process.
What are the ores and minerals of gold?
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What are precious elements? Can they be extracted by smelting from its ores?
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What is the principle of zone refining?
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What material is used for the construction of the side walls of the vertical zinc retort? Justify its use.
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What is matte smelting?
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What is flash smelting?
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What is blister copper?
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What are the important ores of aluminum?
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Part B
How is blister copper refined electrolytically?
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Discuss the treatment of anode mud in copper refining.
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Compare and contrast between electrowinning and electrorefining of copper.
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Discuss about copper ores in India.
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Explain the production of zinc by electrolysis process and refining process.
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With a neat sketch of flow sheet, explain each and every step of hydrometallurgical extraction of zinc.
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Discuss how silica in bauxite affects its digestion for alumina production.
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Explain why aluminum is not produced by carbon reduction in blast furnace.
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Why is it necessary to use a bath of fused salt for its electrolytic production of aluminum?
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Write short notes on the following:
ALCOA process of alumina production
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Reduction plant at HINDALCO.
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Explain Pidgeon process of Magnesium production and discuss the chemical reactions involved.
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Explain the applications of Magnesium.
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Explain the flow sheet on process metallurgy of Magnesium from sea water.
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Write the flow sheet for extraction of Nickel and explain the important reactions in the process.
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What are the ores and minerals of tungsten?
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Distinguish between acid and alkali processes for digestion of Uranium ores.
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How reactor grade UO2 is produced?
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