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

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

Hammer mills with internal classification

Agitated mills and fluid energy mills

Toothed roll crusher

Micronizers

Hammer mills with internal classification

Agitated mills and fluid energy mills

Toothed roll crusher

Micronizers

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Mechanical Operations
In case of a hammer crusher, the

Minimum product size is 3 mm

Feed may be highly abrasive (Moh's scale >5)

Maximum feed size may be 50 mm

Rotor shaft carrying hammers can be vertical or horizontal

Minimum product size is 3 mm

Feed may be highly abrasive (Moh's scale >5)

Maximum feed size may be 50 mm

Rotor shaft carrying hammers can be vertical or horizontal

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Mechanical Operations
Bond crushing 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

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

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

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Mechanical Operations
For spheres, the specific surface shape factor is given by

D/V

A/V

AD/V

√(AD/V)

D/V

A/V

AD/V

√(AD/V)

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Mechanical Operations
Soft & non-abrasive materials can be made into fines by

Compression

Cutting

Attrition

None of these

Compression

Cutting

Attrition

None of these

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Mechanical Operations
The reduction ratio for fine grinders is

20-40

44124

43961

As high as 100

20-40

44124

43961

As high as 100

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Mechanical Operations

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

Mechanical Operations In case of a hammer crusher, the

Mechanical Operations Bond crushing law

Mechanical Operations For spheres, the specific surface shape factor is given by

Mechanical Operations Soft & non-abrasive materials can be made into fines by

Mechanical Operations The reduction ratio for fine grinders is

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

Mechanical Operations
In case of a hammer crusher, the

Mechanical Operations
Bond crushing law

Mechanical Operations
For spheres, the specific surface shape factor is given by

Mechanical Operations
Soft & non-abrasive materials can be made into fines by

Mechanical Operations
The reduction ratio for fine grinders is