JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II MINERAL PROCESSING Previous Question Paper (April - 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 in Part B carries 10 marks.
Part A
Define Ore and Mineral.
Answer
A mineral is a naturally occurring inorganic solid substance with a definite chemical composition and ordered atomic structure. An ore is a mineral or aggregate of minerals from which a metal or other valuable constituent can be profitably extracted.
List out ores and Minerals for Fe, Al and Cu with their chemical composition.
Answer
| Metal | Ore/Mineral | Chemical Composition |
|---|---|---|
| Fe | Hematite | Fe2O3 |
| Al | Bauxite | Al2O3·2H2O |
| Cu | Chalcopyrite | CuFeS2 |
Explain recovery in brief.
Answer
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Calculate the aperture size in µ of a 200mesh sieve having a wire diameter of 53µm.
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What are the various materials used to form heavy suspensions in fluid in DMS?
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What are the factors influencing magnetic properties of the ore?
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Explain consolidation trickling.
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Describe various types of jig cycles.
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Define collector and frothers.
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Why flotation process is used for fine particles only?
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Part B
Draw the flow chart showing principle steps in Mineral Processing. Explain the need of each step.
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Draw a simplified diagram of Blake Jaw Crusher showing different parts. Explain the factors affecting its operation.
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Derive the relation between critical speed of ball mill and its diameter.
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Explain the term “Liberation”? What is theory of liberation? Explain its significance in Mineral Processing?
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What is free settling ratio? Derive the equation for free settling ratio as per Newton's law.
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List different laboratory sizing techniques and describe in brief about them.
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Define the term classifier. Explain the working process of mechanical classifier with the help of a schematic diagram.
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Explain the term recovery, ratio of concentration, enrichment ratio? How they are calculated? Derive relevant formulas.
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Discuss Heavy media separation in brief and draw a simplified flowsheet of DMS.
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Explain the principle of magnetic separation and mention the process description.
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What is Electrical Separation? Explain High Tension Separator in brief.
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Describe different media employed for the DMS with examples.
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What is Jigging? Explain its principles and applications.
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Describe the working principle of wilfly table with suitable diagram.
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What are the design considerations of a jig?
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Explain the term 'Initial acceleration' used in jigging process. Draw a diagram of jig and explain its parts.
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Explain the role of reagents and modifiers in forth flotation method.
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Explain principle of froth flotation technique. Discuss different process variables.
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Explain benefits and limitations of flotation process.
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What are the various types of flotation? Explain them in brief.
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