PLACER CONCENTRATION SLUICE BOX Russian patent published in 2002 - IPC

FIELD: concentration of placers and ores of noble and rare-earth metals through wet gravitational separation in flow of pulp flowing over inclined working surface. SUBSTANCE: placer sluice box includes inclined chute with bottom and side walls; bottom is provided with riffles located longitudinally relative to flow of pulp with grooves between them; sluice box is also provided with unloading unit having heavy fraction cut-off ; inclination of chute bottom and riffles is made at increasing slope towards cut-off of unloading unit. EFFECT: enhanced efficiency of extraction of fine grains of heavy fraction. 9 cl, 2 dwg