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Posted By: yamini Member Level: Gold Posted Date: 10 May 2008
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2007 Jawaharlal Nehru Technological University B.Tech Metallurgy & Material Technology II II MMT Mineral Dressing 2007 Question paper
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Code No: R05221804 Set No. 1
II B.Tech II Semester Regular Examinations, Apr/May 2007
MINERAL DRESSING
(Metallurgy & Material Technology)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) Explain the working of' 'Table sampling' method. What are the advantages
and limitation of this method.
(b) Discuss briefly about the following:
i. Feed sampling
ii. Concentrate sampling
iii. Tailing sampling. [8+8]
2. (a) What are the factors an which, the energy that the ball mill can consume
depend? Explain them in detail.
(b) Discuss the recent trends in grinding and crushing operations. [8+8]
3. (a) Explain how the particle size is for di erent regular and irregular shapes can
be measured?
(b) Define and explain the term ‘classification technique’.
(c) What type of material are suitable for screening and classification techniques?
Why? [8+4+4]
4. Write shot note on the following type of classifiers:
(a) Rake classifiers
(b) Spiral classifiers.
5. Describe the working principle of the following heavy suspension separators:
(a) Vooys process.
(b) Huntington - Heberlein
(c) sink float process
(d) Di erential density process. [6+5+5]
6. (a) What are the di erent factors that a ect the stratification of particles in a
?Jig?. Explain them.
(b) Explain the following:
i. Consolidation trickling
ii. Rate of stratification. [8+5+3]
7. (a) What is flotation? Explain the principle of flotation in detail.
(b) Distinguish between direct flotation and reverse flotation.
(c) Compare and contrast ‘cohesion’ and ‘adhesion’.
(d) What is work of adhesion? Explain. [6+3+3+4]
8. (a) What are di erent magnetic substances? Describe them.
(b) Explain the principle & mechanism of magnetic separation.
(c) What are the important applications of magnetic separation. [5+8+3]
Code No: R05221804 Set No. 2
II B.Tech II Semester Regular Examinations, Apr/May 2007
MINERAL DRESSING
(Metallurgy & Material Technology)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) Distinguish between ‘short hand’ and standard cone crusher.
(b) What is angle of nip? Explain the significance of angle of nip in roll crushers.
Derive an expression for the angle of nip in roll crusher. [6+10]
2. (a) Explain the major di erences between wet grinding and dry-grinding.
(b) Explain the following:
i. open circuit grinding
ii. closed circuit grinding. [8+8]
3. (a) Explain how the particle size is measured under a microscope.
(b) What are the di erent techniques of sizing operation. Explain their operating
principle in detail. Discuss the advantages of each these in detail. [4+12]
4. Write short notes on the following:
(a) separation of fine valuable mineral from coarse waste.
(b) separation of coarse valuable mineral from fine waste. [8+8]
5. (a) What are the di erent liquid media used in heavy media separation. Explain
their advantages, disadvantages.
(b) Explain the importance of the following media in heavy fluid separation process
i. acetylene tetrabromide
ii. zinc chloride
iii. calcium chloride. [8+8]
6. Describe the e ect of the following on the stratification of Jigging:
(a) Di erential acceleration at the beginning of fall.
(b) Consolidation trickling at the end of the stroke. [8+8]
7. (a) Define the term 'PH'. Explain the importance of 'PH' in flotation process.
(b) What is flotation column? Explain. Discuss the main advantages of flotation
columns.
(c) Draw a neat sketch of a flotation column and explain the important compo-
nents in it. [5+6+5]
8. (a) Explain the various factors that a ect the conductivity of minerals.
(b) How are the industrial electrostatic separators classified. Explain about any
one type of electrostatic separator. [8+8]
Code No: R05221804 Set No. 3
II B.Tech II Semester Regular Examinations, Apr/May 2007
MINERAL DRESSING
(Metallurgy & Material Technology)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) What is sampling? What are the advantages and limitations of sampling.
(b) Explain the procedure to be adopted to collect a sample. [10+6]
2. (a) Give the expression for the critical speed (Fahrenwald) in a ball. Explain the
various terms invalued in the expression.
(b) With a neat sketch explain, the motion of charge in a tumbling ball millindi-
cating the important zones in the mill. [8+8]
3. (a) Explain how the particle size is for di erent regular and irregular shapes can
be measured?
(b) Define and explain the term ‘classification technique’.
(c) What type of material are suitable for screening and classification techniques?
Why? [8+4+4]
4. (a) With the help of a neat sketch describe the constructional details and working
of Allen cone. What are its important applications.
(b) What are the factors, on which the performance of classifier depend? Explain
them in detail. [8+8]
5. Describe the working principle of the following heavy suspension separators:
(a) Vooys process.
(b) Huntington - Heberlein
(c) sink float process
(d) Di erential density process. [6+5+5]
6. (a) What are the di erent factors that control the operation of shaking tables.
Explain them fully.
(b) Discuss the factors the influence the capacity of shaking tables. [8+8]
7. Explain the following terms:
(a) flotation reagents.
(b) hydrophobic.
(c) froth flotation.
(d) reverse flotation.
(e) contact angle. [4+3+3+3+3]
8. (a) What is cryogenic? What is the principle of cryogenic magnetic separation?
What are its important applications.
(b) Discuss about the following cryogenic magnetic separators
i. continuous flow magnetic separator.
ii. wet-dry magnetic separator. [6+5+5]
Code No: R05221804 Set No. 4
II B.Tech II Semester Regular Examinations, Apr/May 2007
MINERAL DRESSING
(Metallurgy & Material Technology)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) Distinguish between hand sampling and mechanical sampling methods.
(b) Explain the principle of operation and working of a snyder sampler with the
help of a neat sketch. [8+8]
2. (a) Discuss about ‘linear wear’ and ‘ball wear’ in ball mills. Which is more severe
between the two? Why?
(b) What is grinding? How is it di erent from crushing? Explain the various
types of grinding operations. [8+8]
3. (a) Describe elutriation technique in detail. Explain the advantages, disadvan-
tages of this methods. Also give the applications of this methods in sizing
operations.
(b) Bring out the di erence between industrial sizing and laboratory sizing. What
are the various methods available in each of them. Describe their working
principle. [8+8]
4. (a) With the help of a sketch, describe the constructional details of Fahrenwald
sizer.
item How do you find out the capacity of a classifier? Explain in detail.[8+8]
5. (a) What are the di erent shapes used for separator vessel. Explain the advan-
tages of each of these shapes in the separation process.
(b) Explain the di erent means adopted to keep the solid material moving and to
maintain the pulp in suspension. [8+8]
6. (a) Explain the mechanism of stratification in jigging process.
(b) Distinguish between the working principles of ‘Jigs’ and ‘classifiers’.
(c) Explain about ‘hindered settling classification’ in the Jigging process.[4+4+8]
7. (a) What are the various reagents required in the flotation process? Explain with
examples.
(b) What are frothers? Explain the action.
(c) Explain the e ect of particle size and shape on the flotation process. [5+5+6]
8. (a) What do you mean by magnetism?
(b) How are magnetic materials classified? Discuss them.
(c) What is Ferromagnetism? Which are ferromagnetic material? Explain them.
(d) Distinguish between Ferromagnetism and Paramagnetism. [2+6+5+3]
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