Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2018 Winter 5th Sem New 2152107 Extraction Of Non Ferrous Metals Previous Question Paper
1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?V (NEW) EXAMINATION ? WINTER 2018
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:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) Write short note on Khetri copper plant. 03
(b) Describe SWOT analysis of Indian nonferrous metal industries. 04
(c) With the help of line diagram, explain the Pidgeon process for extraction
of magnesium mentioning the thermodynamic reasons.
07
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
to use a bottom-blown converter to produce blister copper from matte.
04
(c) Explain the WORCRA process for Copper production. Mention the
factors affecting efficiency of WORCRA process.
07
OR
(c) What is anode slime? Explain the process of precious metal recovery
from it.
07
Q.3 (a) Why carbon electrode and cryolite are used in Hall-H?roult process. 03
(b) Discuss the Factors affecting current efficiency in Hall-Heroults process
of Al extraction.
04
(c) Discuss Bayer process for alumina production and give the flow sheet. 07
OR
Q.3 (a) Why the carbothermic reduction process not used for extraction of
aluminum on commercial scale?
03
(b) Explain the three?layer process of Aluminum refining. 04
(c) Explain the ALCOA process for Aluminum production. Why does the
ALCOA process consume less energy than the Hall-H?roult process?
07
Q.4 (a) Differentiate between Single step and multistep continuous processes for
copper extraction.
03
(b) Explain the Electrolytic refining process of Blister copper. 04
(c) Explain the process for lead extraction from its ore. Draw the flow sheet
with important parameters involved in the process.
07
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
Q.5 (a) In the pyrometallurgical extraction of Zinc why we not used the
technique of smelting and converting, as applied in the case of copper?
03
(b) Differentiate between horizontal and vertical retorts in pyrometallurgical
extraction of Zinc.
04
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ?V (NEW) EXAMINATION ? WINTER 2018
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:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) Write short note on Khetri copper plant. 03
(b) Describe SWOT analysis of Indian nonferrous metal industries. 04
(c) With the help of line diagram, explain the Pidgeon process for extraction
of magnesium mentioning the thermodynamic reasons.
07
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
to use a bottom-blown converter to produce blister copper from matte.
04
(c) Explain the WORCRA process for Copper production. Mention the
factors affecting efficiency of WORCRA process.
07
OR
(c) What is anode slime? Explain the process of precious metal recovery
from it.
07
Q.3 (a) Why carbon electrode and cryolite are used in Hall-H?roult process. 03
(b) Discuss the Factors affecting current efficiency in Hall-Heroults process
of Al extraction.
04
(c) Discuss Bayer process for alumina production and give the flow sheet. 07
OR
Q.3 (a) Why the carbothermic reduction process not used for extraction of
aluminum on commercial scale?
03
(b) Explain the three?layer process of Aluminum refining. 04
(c) Explain the ALCOA process for Aluminum production. Why does the
ALCOA process consume less energy than the Hall-H?roult process?
07
Q.4 (a) Differentiate between Single step and multistep continuous processes for
copper extraction.
03
(b) Explain the Electrolytic refining process of Blister copper. 04
(c) Explain the process for lead extraction from its ore. Draw the flow sheet
with important parameters involved in the process.
07
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
Q.5 (a) In the pyrometallurgical extraction of Zinc why we not used the
technique of smelting and converting, as applied in the case of copper?
03
(b) Differentiate between horizontal and vertical retorts in pyrometallurgical
extraction of Zinc.
04
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2
(c) With the help of flow sheet explain the process of tin extraction from its
concentrate. Why tin is produced by three stages process? Explain with
thermodynamic reasons.
07
OR
Q.5 (a) Discuss the parke?s process for silver recovery from lead. 03
(b) Why the scrap iron is used in second and third stage of smelting in tin
extraction process.
04
(c) Explain the Imperial Smelting process for production of zinc with
necessary sketches. List out the advantages.
07
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This post was last modified on 20 February 2020