GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-V (NEW) EXAMINATION - WINTER 2018
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Subject Code:2152107 Date:20/11/2018
Subject Name:Extraction of Non Ferrous Metals
Time: 10:30 AM TO 01:00 PM Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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MARKS
Q.1 (a) Write short note on Khetri copper plant. 03
(b) Describe SWOT analysis of Indian nonferrous metal industries. 04
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(c) With the help of line diagram, explain the Pidgeon process for extraction 07 of magnesium mentioning the thermodynamic reasons.
Q.2 (a) Justify the purpose of roasting and smelting in the extraction of Copper. 03
(b) Using phase diagram of Cu-Cu2S system, explain why it is not possible 04 to use a bottom-blown converter to produce blister copper from matte.
(c) Explain the WORCRA process for Copper production. Mention the 07 factors affecting efficiency of WORCRA process.
OR
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(c) What is anode slime? Explain the process of precious metal recovery 07 from it.
Q.3 (a) Why carbon electrode and cryolite are used in Hall-Héroult process. 03
(b) Discuss the Factors affecting current efficiency in Hall-Heroults process 04 of Al extraction.
(c) Discuss Bayer process for alumina-production and give the flow sheet. 07
OR
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Q.3 (a) Why the carbothermic reduction process not used for extraction of 03 aluminum on commercial scale?
(b) Explain the three—layer process of Aluminum refining. 04
(c) Explain the ALCOA process for Aluminum production. Why does the 07 ALCOA process consume less energy than the Hall-Héroult process?
Q.4 (a) Differentiate between Single step and multistep continuous processes for 03 copper extraction.
(b) Explain the Electrolytic refining process of Blister copper. 04
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(c) Explain the process for lead extraction from its ore. Draw the flow sheet 07 with important parameters involved in the process.
OR
Q.4 (a) Give the ores of nickel with their chemical formula. 03
(b) Explain the carbonyl process for refining of nickel. 04
(c) Discuss the amalgamation and chlorination process for gold extraction. 07
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Q.5 (a) In the pyrometallurgical extraction of Zinc why we not used the 03 technique of smelting and converting, as applied in the case of copper?
(b) Differentiate between horizontal and vertical retorts in pyrometallurgical 04 extraction of Zinc.
(c) With the help of reaction kinetics of tin extraction, explain the roasting 07 of tin concentrate. Why tin is produced by three stages process? Explain with thermodynamic reasons.
OR
Q.5 (a) Discuss the parke’s process for silver recovery from lead. 03
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(b) Why the scrap iron is used in second and third stage of smelting in tin 04 extraction process.
(c) Explain the Imperial Smelting process for production of zinc with 07 necessary sketches. List out the advantages.
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