Gravity classifier
Metso's Mining and Construction Technology
These intelligently engineered gravitational classifiers are ideal for classifying coarser cuts ranging from 150 to1650 microns. Feed material is dropped in a continuous feed curtain and enters the classifier at the top of the unit. Low velocity air enters the classifier at inlet and is forced through the feed curtain which is dropping in front of the air outlet provided with widely spaced vanes. The air stream enters the feed curtain perpendicularly, but is changed to an almost parallel, but reverse direction to the feed curtain as it passes through the vane.
Metso's gravitational classifiers separate articles at any predetermined cutpoint between 150 to 1651 microns (100 to 10 mesh).
Power requirements are extremely low; most energy lost is due to the change of direction of the air stream as it is exhausted through the vanes. To effect classification, the resistance to gas flow or draft loss ranges from 0.5" W.G. to 4.0" W.G., depending on the cutpoint and feed-to-air ratio. The higher the cutpoint, the higher the draft loss. The gas flow through the vanes must be increased to provide a high drag force. The volume of gas-to-feed ratio ranges from 150 to 300 cfm per ton per hour of classified feed.
Gravitational classifiers are suitable for:
* De-dusting of coarse materials
* Wide range of material capabilities
* High feed loading rate
* Used as a density separator if S.G. of product and waste is > 5:1 ratio
Main benefits of Gravitational classifiers are:
* No moving parts
* Simple operation
* Low pressure drop operation
* Stationary and transportable systems available
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