JNTU
JNTU B.Tech III NONFERROUS EXTRACTIVE METALLURGY Previous Question Paper (February/March - 2022 - R16)
Answer any five questions. All questions carry equal marks.
Main
Draw flow sheet for pyrometallurgical extraction of Cu from copper sulphide ore.
Answer
The pyrometallurgical extraction of copper from sulphide ores follows this sequence: 1. Concentration by froth flotation to produce copper concentrate. 2. Roasting of concentrate to remove excess sulphur. 3. Smelting in a reverberatory furnace or flash furnace to produce matte (Cu2S-FeS) and slag (Fe-silicates). 4. Converting of molten matte in a converter by blowing air to oxidize FeS to slag and convert Cu2S to blister copper. 5. Fire refining and electrolytic refining to achieve high purity copper.
Draw a neat sketch of Blast furnace? Describe the various parts in it.
Answer
A blast furnace is a tall, vertical shaft furnace used for smelting. Its main parts include:
- Stack (Shaft): The upper conical section where the charge (ore, flux, coke) is preheated and undergoes initial reduction.
- Bosh: The middle section where the temperature is highest, and the charge begins to melt.
- Tuyeres: Nozzles located at the bottom of the bosh through which hot air or oxygen-enriched blast is injected to burn the coke.
- Hearth (Crucible): The bottom-most section where the molten metal and slag collect and are periodically tapped out through tap holes.
Draw flow sheet for the extraction of copper via smelting process.
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Discuss the working principle of electric arc furnace with a neat sketch.
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Describe the Imperial Smelting Process for production of Zn with a flow sheet.
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List out the differences between electro winning and electro refining.
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Explain the lead extraction process via Queneau-Schuhmann-Lurgi (QSL) route.
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Briefly discuss various lead extraction methods.
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Discuss the production process of pure Al2O3.
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Draw an electrolytic cell setup explaining various parts and their mechanism.
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Discuss the extraction of aluminium via Deville pechiney process with a neat sketch.
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Explain in brief various alternative methods used for aluminium extraction.
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Discuss Pidgeon process for Magnesium extraction with a neat flow chart.
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Discuss the practice and problems of electro-winning for extraction of Magnesium.
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Discuss the production of reactor grade uranium with a flow chart.
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Discuss the current scenario of non-ferrous metal industry in India with useful insights.
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