Hutch chamber for jig

A centrifugal jig having a container mounted for rotation about a longitudinal axis thereof, the container having an axial region, a peripheral region including a plurality of hutch chambers circumferentially spaced about said axis and 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 outward 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 that narrows toward said concentrate outlet, each hutch chamber having a respective reciprocating drive means for actuating the respective reciprocating wall portion.

A centrifugal jig having a container mounted for rotation about a longitudinal axis thereof, the container having an axial region, a peripheral region including a plurality of 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 outward 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 that narrows toward said concentrate outlet, wherein each reciprocating wall portion reciprocates along a substantially radial line of action which intersects with the screen means.