HORIZONTAL COUNTERFLOW SCREW-TYPE EXTRACTOR Russian patent published in 2001 - IPC

FIELD: performing processes in liquid-solid system; recovery of metal- containing solid industrial wastes; dissolving, leaching-out and extracting processes in food-processing and chemical industries, metallurgy and other industries. SUBSTANCE: extractor has horizontal sections arranged in housing and provided with coupling flanges; first section is provided with flange for loading bin filled with material to be treated and last section is provided with extractant supply branch pipe. Besides that, extractor has main screw feeder for motion of material being extracted, frame-type mixers, extractant discharge branch pipe, hole for discharge of extracted material and heat-transfer agent supply pipe line. Mounted after last section is additional section used for neutralization of extractant and provided with hole for discharge of extracted material. Sections have U-shaped cross-section and three zones: extractant discharge zone separated from reaction zone by means of partition which stops short of the bottom; this zone changes to material motion zone with taper section of housing. Main screw feeder for motion of material to be extracted is made form of coil with blades connected to it; it is connected with heat- transfer agent supply line. Main screw feeder of each section consists of first and second spiral parts interconnected by means of horizontal section on which frame-type mixer is fitted. Provision is made for return supply screw feeder whose diameter and pitch are equal to 0.6 to 0.8 of diameter and pitch of first part of main screw feeder. Second part of main screw feeder is taper in shape; its pitch and diameter decrease towards motion of material. Return supply screw feeder is made in form of coil whose horizontal section is located coaxially relative to taper section of main screw feeder; it is provided with sickle-shaped pipe union lowered in extractant discharge zone of subsequent section, but for the additional section; other end of return supply screw feeder is located in reaction zone of previous section. Branch pipes for introducing correcting solution are fitted in cover of housing above reaction zones of center sections of extractor. EFFECT: intensification of leaching-out process; reduced power requirements; reduced labor consumption. 2 dwg