This document discusses different types of screening equipment used to separate particles by size. It describes six common types of screening equipment that separate materials using horizontal or vertical gyrations, shaking, or mechanical or electrical vibration. The standard screen size range provided is 4 inches to 400 mesh. Fixed inclined screens are used for coarse screening of large lumps, while revolving screens are generally used for larger particles. The document also provides definitions and examples of work index and mixing index as measures of screening and mixing processes.

1. Screening
Equipment's

2. Screening Equipment
 Screening equipment can be classified on
the basis of size of material as the screens may
be required to pass ranging from several mm
in diameter down to 200 mesh.
 Screening is a method of separate particles
according to size

3. Standard screen range is 4 inch to 400 mesh.
Fixed inclined screens are used for the coarse
screening of large lumps.
Revolving screens are generally used for large
particles.

4. There are six types of screening
equipment.
1. Gyrations in horizontal plane (a)
2. Gyrations in vertical plane (b)
3. Gyrations at one and shaking at other (c)
4. Shaking (d)
5. Mechanically Vibrated (e)
6. Electrically Vibrated (f)

6. Screening Equipment:

7. Work Index:-
Work index w is defined as the amount of energy in
kilowatt-hours per ton of feed material.
A required to reduce a very large feed to such a size
that 80 percent of the product of the passes
through 100 um screen.

8. p=Power required by machine
m= Feed rate to machine
wi=Work index
Dpa,Dpb=particle size of the feed and
product in mm

9. Sr. No. Material Working Index
1. Clay 6.30
2. Gypsum rock 6.37
3. Bauxite 8.78
4. Phosphate rock 9.92

10. Mixing Index:-
Mixing index is a measure of the degree to which
fluid flow will promote the dispersion of dissolved
solutes or suspended materials in the fluid, leading
to homogeneity.
It is an indicator of the quality of the mixing
process.

11. Types of Mixing:-
1. Solid-Solid mixing
2. Liquid-Liquid mixing
3. Gas-Gas mixing
4. Liquid-Solid mixing
5. Liquid-Gas mixing
6. Gas-Solid mixing

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