Chemical Engineering Learning Resources

### Mechanical Operations

#### Spericity of Cylindrical Particle

Sphericity of Cylinder

Calculate the sphericity of a cylinder of dia 1 cm and height 3 cm.

#### Diameter of Roll Crusher

Diameter of Roll Crusher

A pair of rolls is to take a feed equivalent to spheres of 3 cm in diameter and crush them to spheres having 1 cm diameter

#### Screening And Classification

Screening And Classification

A mixture of coal and sand particles having sizes smaller than 1 x 10-4 m in diameter is to be separated by screening and subsequent elutriation

#### Agitation - Power Required

Agitation - Power Required

An agitated baffle vessel is being used to prepare a uniform solution of viscosity 2 cP, running the agitator at 100 rpm, so as to obtain

### Classification of Solid Particles based on Terminal Settling Velocity

In a mixture of quartz (sp.gr = 2.65) and galena (sp.gr = 7.5), the size of the particles range from 0.0002 cm to 0.001 cm.

## Ball Mill - Operating Speed

In a ball mill of diameter 2000 mm, 100 mm dia steel balls are being used for grinding. Presently, for the material being ground, the mill is run at 15 rpm