APPARATUS FOR RECOVERING PRECIOUS METALS Russian patent published in 1999 - IPC

FIELD: mining industry. SUBSTANCE: invention can be applied when recovering undersize and fine precious metal fractions from sands and ground ores in development of ore deposits and placers. Apparatus comprises elastic conical cup with inside annular riffles mounted free to rotate about its vertical axis, vertical-blade impeller fastened in the lower section of cup, pressing rolls regularly allocated over periphery of cup and installed on circular platform to rotate about cup, double-walled connecting pipe for slurry capable to fed pressure water into intertubular annular gap, radial holes made in outside connecting pipe matching annular groves in cup as to their height, facilities for removing tail and discharging concentrate. EFFECT: increased productivity die to reduced concentrate discharge time. 1 dwg