JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II Year PRINCIPLES OF EXTRACTIVE METALLURGY Previous Question Paper (December - 2018 - R16)
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
What are the advantages of volatile roasting process.
Answer
Volatile roasting allows for the efficient separation of volatile metal oxides or chlorides from non-volatile gangue materials, enabling the recovery of metals from low-grade or complex ores without extensive chemical processing.
Give the classification of ores.
Answer
Ores are classified based on their chemical composition into: 1) Oxide ores (e.g., Hematite, Bauxite), 2) Sulphide ores (e.g., Galena, Chalcopyrite), 3) Carbonate ores (e.g., Calcite, Siderite), and 4) Halide ores (e.g., Rock salt, Fluorspar).
What are the limitations of sintering?
Answer
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Write the uses of slags.
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Distinguish between bacterial leaching and Pressure leaching.
Answer
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What are the limitations of solvent extraction?
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Why electro winning is cheaper than electro refining.
Answer
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What is the anode, cathode and electrolyte used in electro-refining of Bauxite ores?
Answer
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What is the importance of refining process?
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What are the advantages of distillation?
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Part B
Explain about fluidized bed roasting.
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Write a note on thermodynamics of extraction.
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Discuss briefly about flash roasting.
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Distinguish between volatile roasting and chloridizing roasting.
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What is slag and Discuss its properties?
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Distinguish between sintering and pelletisation.
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Draw and explain the principle and operation of DWLD sintering machine.
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Explain about cementation process with suitable examples.
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Distinguish between Ion exchange and Solvent extraction.
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With suitable example explain the Solvent extraction process.
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Explain in detail the Cementation process.
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What are the principles of Electrometallurgy and classify it?
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What are advantages and disadvantages of Electrometallurgy?
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Explain the electrowinning process of copper by using different electrolytes.
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What are the advantages and disadvantages of electrowinning process?
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Write explanatory notes on:
Distillation
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Liquation.
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Explain in detail with suitable example the zone refining process.
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