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Mechanical Operations

Mechanical Operations
Ball mills and tube mills with flint or porcelain balls are used for size reduction of

Limestone
Asbestos
Rubber
Non-metallic ores

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Mechanical Operations
Stamp mills are generally used for crushing

Iron ores
Talc
Diamond
Gold ores

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Mechanical Operations
Solid particles of different densities are separated by

Cyclones
Sorting classifier
Thickness
Filters

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Mechanical Operations
A __________ employs a set of screen across a flow channel for the separation of dirt/rust from a flowing liquid stream.

Clarifier
Thickener
Strainer
Classifier

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Mechanical Operations
Height of liquid in agitation tank is normally maintained equal to the tank diameter. However, if the tank is too tall and a large liquid hold up is desired, then two or more impellers mounted on the same shaft may be used. The clearance between the tank bottom and the bottom most impeller should be about (where, D = impeller diameter)

D
2 D
1.5 D
0.5 D

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Mechanical Operations
Pulverised coal passing through 200 mesh screen has a diameter of 0.074 mm (74 micron). The same passing through 50 mesh screen will have a dia of __________ mm.

0.014
0.007
50
0.3

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