| 摘要 |
Fractions of different densities contained in an ore or other solid material are separated by directing the solid material in a liquid suspension on to a surface of an endless belt, moving in the direction of its length and inclined transversely to its direction of motion, along a first part of the length of a higher portion of the belt and subjecting said moving surface of the belt to a shaking motion so that lighter fractions are separated from the material and flow off a lower side edge of the belt into a receptacle. Washing liquid is directed on to the moving surface from another part of the length of the higher portion of the belt that is downstream of the first part so that washing liquid flows transversely across the shaking, moving surface to separate middling fractions from the material and carry them off the lower side edge of the belt into a second receptacle. Heavier fractions that remain on the moving surface are discharged over the downstream end of the moving surface of the endless belt into a third receptacle. The middling fractions collected in the second receptacle are re-treated by redirecting them on to the belt along a part of the higher portion of the belt between the positions where the material and the washing liquid are directed on to the belt, the heavier of the middling fractions being discharged over the downstream end of the moving surface into the third receptacle. Preferably the higher portion of the moving surface of the belt extends lengthwise along or adjacent the central longitudinal axis of the surface thereby providing for two separation processes to be effected concurrently on a single endless belt.
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