| 摘要 |
1. A centrifugal jig having a container mounted for rotation about a longitudinal axis thereof, the container having an axial region, a peripheral region including one or more hutch chambers separated from the axial region by ragging which is radially restrained by screen means, means for introducing feed material to the axial region and means for pulsating fluid in said peripheral region so as to repetitively dilate said ragging, characterized in that the pulsating means is located directly radially outwards of said screen means and includes a reciprocating radially outer wall portion of the respective hutch chamber, each reciprocating wall portion including a concentrate outlet and a convergence leading thereto. 2. A centrifugal jig according to claim 1 wherein the peripheral region includes a plurality of said hutch chambers circumferentially spaced about said axis, each hutch chamber having respective reciprocating drive means for actuating the respective reciprocating wall portion. 3. A centrifugal jig according to claim 2 wherein the reciprocating drive means includes a lever driven by a respective pushrod, and crank means for reciprocating each of the pushrods. 4. A centrifugal jig according to claim 2 wherein each reciprocating wall portion is biased to non-pulsating position by centrifugal motion of the jig. 5. A centrifugal jig according to claim 4 wherein each reciprocating wall portion includes a diaphragm with a support block. 6. A centrifugal jig according to claim 1 wherein each reciprocating wall portion reciprocates along a substantially radial line of action which intersects with the screen. 7. A method of separating components of a feed material on the basis of specific gravity, the method employing the centrifugal jig and including the steps of introducing the feed material to the axial region and repetitively dilating the ragging by activation of said pulsating means. 8. A jig having at least one hutch chamber, said hutch chamber having a reciprocating wall portion which includes a concentrate outlet and a convergence leading thereto. 9. A jig according to claim 8 wherein reciprocation of said wall portion causes pulsation of fluid in the hutch chamber so as to effect repetitive dilation of a ragging layer in the jig. 10. A jig according to claim 9 wherein the jig is a centrifugal jig and wherein the hutch chamber is located radially outside a screen means which supports the ragging. 11. A jig according to claim 9 wherein the jig is a gravity jig and the hutch chamber is located below a screen means which supports the ragging. |
