Screening Flashcards
(19 cards)
Clear space between individual wires of the screen
Screen aperture
A 10 mesh screen will have a 10 openings per inch and the aperture will be…
0.1 inch minus the diameter of the wire
This refers to the treatment of a material containing a natural amount of moisture or a material that has been dried screening
Wet screening
In the Tyler standard sieve series, the other sizes vary by a fixed ratio of what?
Sqroot of 2
Suitable for small scale operation such as screening sand, gravel or coal
Stationary screens
Screens this group are usually from 1/2 inch to 60 mesh
Oscillating screens
These are box like machines either round or square with a series of screen cloths nested atop one another.
Gyratory screens
Speed of vibrated screens
1500 to 7200 vibrations/min
These are used for screening large sizes, particularly of 1 inch and over.
Grizzlies
The material passing one screening surface and retained on a subsequent surface is called.
Intermediate material
The removal of small amount of oversize from a feed which are predominantly fines is called
Scalping
Removal of free water from solids-water mixture and is generally limited to 4 mesh and above.
Dewatering
Another name for revolving screen
Trommel screen
The wire diameter of a 10 mesh screen whose aperture is 0.065 in is
0.035 in
Increasing the capacity of a screen,
Decreases the screen effectiveness
As the particle size is reduced,
Screening becomes pregressively more difficult
A screen is said to be blinded when
The screen is plugged with solid particles
Size measurement of ultrafine particles can be best expressed in terms of
Surface area per unit mass
Trommel separate a mixture of particles depending on their
Size
