Chemical Engineering :: Mechanical Operations
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Which of the following mineral dressing operations is termed as 'comminution'?
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The capacity of a pneumatic conveying system depends upon the
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Pick out the wrong statement.
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Gravity settling process is not involved in the working of a
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Froth floatation is the most suitable for treating
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The energy required per unit mass to grind limestone particles of very large size to 100 μm is 12.7 kWh/ton. An estimate (using Bond's law) of the energy to grind the particles from a very large size to 50 μrn is
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Which of the following is the most suitable for cleaning of fine coal dust (<0.5 mm) ?
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Pick out the correct statement:
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Range of compressibility co-efficient of the commercial compressible cake obtained in filtration operation is
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Highly viscous liquids & pastes are agitated by
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A.
Close circuit grinding is more economical than open circuit grinding.
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B.
Cod oil, beef tallow or aluminium stearates are used as grinding aids in cement 'industries'.
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C.
The equipment used for the removal of traces of solids from a liquid is called a classifier.
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D.
Size enlargement is a mechanical operation exemplified by medicinal tablet making.
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A.
Removal of iron from ceramic material is necessitated (by magnetic separation method) so as to avoid discolouration of ceramic products.
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B.
The operating cost of shaking screen is more than that of a vibrating screen.
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C.
Screen capacity does not depend upon the specific gravity of the minerals.
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D.
Asphalt is best crushed using toothed roll crusher.
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