Mechanical Operations
Which of the following is not an ultrafine grinder (colloid mill)?

Agitated mills and fluid energy mills
Toothed roll crusher
Micronizers
Hammer mills with internal classification

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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
Light metal powder down upto 4 meshsize
Powdered food & granular materials

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Mechanical Operations
Rod mills employed for grinding

Employ steel rods of 2-12 cms diameter extending over full length of the mill
Employ a steel shell having L/D ratio of 1.5 to 3.0
All of these
Is useful for handling sticky materials

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