Negative destoner is within the enclosed space in the exhaust, which is equivalent to an upward lift to the material to form a layered material is formed over a light material, the heavy material below. <br><br>Heavy material near the bottom surface of the preparation of the mesh, a large friction force, so that the inclined surface is moved upward in the screen, flow out from the outlet end. Material upper / layer is small, moves downward, the outlet flows from low
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