GATE MT Comminution techniques, Size classification, Flotation, Gravity and other methods of mineral beneficiation; Agglomeration: sintering, pelleting and briquetting. PYQs & Answers

Questions 1–10 of 12. Imported answers require independent review unless marked reviewed.

Wet high intensity magnetic separators (WHIMS) are used to concentrate

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fine (< 75 μm) paramagnetic minerals.

coarse (> 75 μm) ferromagnetic minerals.

coarse (> 75 μm) paramagnetic minerals.

fine (< 75 μm) ferromagnetic minerals.

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Which one of the following reagents is NOT used in froth flotation process?

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Lixiviants

Collectors

Activators

Depressants

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The most effective concentration step for sulfide ores is

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Froth flotation

Magnetic separation

Gravity separation

Electrostatic separation

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Elutriator is used to separate particles based on their sizes in flowing air as shown in the figure.

Diagram for Metallurgical Engineering question 39

Assuming spherical particles, the diameter (D

) of the suspended particles which have 50% chance to report to overflow by turbulent air flow is expressed as

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Copper ore assaying 10 wt.% Cu is fed to a concentration plant at the rate of 100 tons/h. If the grades of concentrate and tailing are 30 wt.% Cu and 1 wt.% Cu, respectively, the percentage recovery of copper in concentrate is __________ (round off to nearest integer).

Given: 1 ton = 1000 kg

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Match the following mineral processing operations (Column I) with the corresponding physical principles (Column II)

Column I (P) Flotation (Q) Jigging (R) Tabling (S) Comminution

Column II (1) Difference in speed of lateral movements (2) Hydrophobicity (3) Difference in size reduction (4) Difference in initial acceleration

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P – 2, Q – 4, R – 1, S – 3

P – 2, Q – 3, R – 1, S – 4

P – 3, Q – 1, R – 4, S – 2

P – 1, Q – 4, R – 2, S – 3

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A sieve made of steel wire of diameter 53 μm has an aperture size of 74 μm. Its mesh number is ______ (round off to the nearest integer).

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For effective communition in a ball mill, it is desired that the balls travelling along the mill wall leave the wall at point C and travel freely in air along the path CDA, as shown in the figure. If

is 120°, the rotational speed of the mill is ______ rpm (round off to one decimal place) by performing suitable force balance at point C.

Assume:

There is no slip between the ball and mill wall.

O is the rotational axis of the mill and OB is parallel to the vector

Inner diameter of ball mill is 3.26 m.

Acceleration due to gravity g is 9.8 m·s

Diagram for Metallurgical Engineering question 47

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Coarse suspended particles are to be separated from a flowing gas in a dust catcher. All factors remaining same, maximum gas-solid separation is expected from the dust catcher shown below.

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