Chemical Engineering :: Mechanical Operations
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Pebble mills are tumbling mills widely used for grinding in the manufacture of paints & pigments and cosmetic industries, where iron contamination in the product is highly objectionable. Pebbles used in pebble mill are made of
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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
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Which of the following relationships between co-efficinet of friction (μ) between rock & roll and a (half of the angle of nip) of the particle to be crushed is correct ?
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Pick out the wrong statement pertaining to the roll crushers.
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Which of the following is not an ultrafine grinder (colloid mill)?
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Two particles are called to be equal settling, if they are having the same.
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Which of the following is the most suitable for handling fibrous and dense slurries ?
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__________ centrifuge is normally used in sugar mills.
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Solid particles separation based on the difference in their flow velocities through fluids is termed as the
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A.
Maximum feed size determines the required roll diameter.
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B.
For hard material's crushing, the reduction ratio should not exceed 4.
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C.
Both the rolls run necessarily at the same speed.
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D.
Reduction ratio and differential roll speed affect production rate & energy consumed per unit of surface produced.
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