JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech III NONFERROUS EXTRACTIVE METALLURGY Previous Question Paper (May/June - 2019 - R13)
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
List out the two minerals of copper along with their chemical formula.
Answer
Two common minerals of copper are:
- Chalcopyrite: CuFeS2
- Chalcocite: Cu2S
Why copper produced after converting is called blister copper.
Answer
Copper produced after converting is called blister copper because of the characteristic blistered appearance on its surface. This is caused by the rapid escape of sulfur dioxide (SO2) gas as the molten copper solidifies, which creates bubbles or blisters in the metal.
List out the applications of zinc.
Answer
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Why updraft sintering is used for lead concentrate?
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What is anode effect in the process of Aluminum extraction?
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Why Aluminum is not produced by carbothermic smelting?
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What are the reducing agents in Pidgeon and Hansgrig process?
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What type of refining process is adopted to Titanium? Give reasons.
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Write down the reactions for acid and alkali leaching of uranium ores.
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List out the properties of Gold.
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Part B
Explain the principle and process of fire refining with reference to copper.
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Explain how copper is recovered from leach solutions.
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What are the advantages of continuous copper production? Explain any one process.
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Describe electro refining of copper.
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Explain how zinc is produced in vertical retort process.
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Describe QSL process.
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Explain how zinc is produced in Imperial Smelting Process.
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How is lead refined? Explain any one process.
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Describe the production of pure alumina.
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What are the remedial processes for anode effect?
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With help of a neat figure describe Hall-Heroult process. What are the precautions to be taken?
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Compare and contrast the alternative processes of Al production.
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Explain Hansgrig process. What are its salient features?
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Describe the refining of Magnesium.
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List out the ores, properties and uses of Titanium.
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Describe the Koll’s process.
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Draw flow sheets for extraction of the following metals and explain the steps:
Nickel
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Gold.
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Draw flow sheets for extraction of the following metals and explain the steps:
Uranium
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Tungsten.
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