GTU BE 4th Semester 142102 Principles Of Extractive Metallurgy Summer 2018 Question Paper

1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE – SEMESTER ?IV (OLD) – EXAMINATION ? SUMMER 2018
Subject Code: 142102 Date: 24/05/2018
Subject Name: Principles Of Extractive Metallurgy
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.
Q.1 (a) Draw and discuss process flow sheet of Al extraction with important
parameters involved in the process.
07
(b) Describe advantages and limitations of Hydrometallurgical extraction
processes.
07

Q.2 (a) Explain the microbial leaching and effect of bacteria on leaching rate and
extent of recovery.
07
(b) Explain importance of oxide free energy diagram in pyrometallurgy and its
limitations.
07
OR
(b) Write a note on sulphide free energy diagram. 07

Q.3 (a) Discuss advantages & Limitations of pyrometallurgical extraction process. 07
(b) Describe different types of smelting furnaces. 07
OR
Q.3 (a) Explain flash smelting process for copper extraction. 07
(b) Discuss about Multiple Hearth roaster and its limitations. 07

Q.4 (a) Explain the ion-exchange processes. 07
(b) Explain the Electrowinning and its applications. 07
OR
Q.4 (a) Explain the role of oxygen in leaching operation with the help of respective
Example.
07
(b) Describe the fused salt electrolysis process. 07

Q.5 (a) Draw and explain the process flow sheet of Zinc extraction. 07
(b) Explain theory of absolute reaction rate. 07
OR
Q.5 (a) What is Order of reactions and Molecularity? Differentiate between Order and
Molecularity.
07
(b) Discuss collision theory of reaction kinetics. 07
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