Mechanical Operations
Reciprocating screens are normally inclined at an angle of 5° with the horizontal and employ gyratory motion at feed end & reciprocating motion at the discharge end. They are not suitable for the screening of the

Heavy tonnages of rocks or gravel
Dry chemicals
Powdered food & granular materials
Light metal powder down upto 4 meshsize

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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

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

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