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

Dry chemicals
Heavy tonnages of rocks or gravel
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

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

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Mechanical Operations
Bond crushing law

Is less realistic in estimating the power requirements of commercial crushers
Calls for relatively less energy for the smaller product particles, than does the Rittinger law
States that the work required for the crushing is proportional to the new surface created
States that the work required to form particle of any size from very large feed is proportional to the square root of the volume to surface ratio of the product

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