Mechanical Operations
Solid particles separation based on the difference in their flow velocities through fluids is termed as the

Elutriation
Sedimentation
Classification
Clarification

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Mechanical Operations
Filter aids like asbestos, kieselguhr, diatomaceous earth etc. are used to increase the porosity of the final filter cake & reducing the cake resistance during filtration. Filter aid is

Separated from the cake by dissolving solids or by burning it off
Added to the feed slurry
All of these
Precoated on the filter medium prior to filtration

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