Gravity Table
Gravity separating tables are used to separate dry granular products by specific weight and are most common in the agricultural and recycling industries. They work on the principle of fluidization and have an inclined reciprocating grading deck.
From an inlet with an adjustable feed rate, the material is fed onto the inclined reciprocating grading deck which normally has a special woven wire mesh surface. High volume, low pressure air is passed through the mesh from a fan, the amount of air available is adjusted to suit the product being processed. This adjustment is to ensure that the lighter product is lifted to the top of the material and the heavier product remains on the surface of the grading deck, resulting in stratification of product.
Due to the reciprocating motions of the inclined deck the heavy product will walk uphill and climb to the highest side, whilst the lighter product will drift down towards the low side. The angle of inclination of the deck and speed of reciprocation interact with air pressure to control this movement.
Read more about this topic: Gravity Separation
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