METHOD FOR DRESSING OF QUARTZ SANDS FOR PRODUCTION OF GLASS CONCENTRATE Russian patent published in 2010 - IPC B07B9/00 B03B9/00 

FIELD: technological processes.

SUBSTANCE: proposed method is related to methods for dressing of quartz sand for production of glass concentrate. Method for dressing of quartz sands for production of glass concentrate realised at two process lines, one of which may work according to dry dressing pattern, for this purpose from receiving hopper raw materials with the help of conveyor are sent to dry screening for separation according to class 3.0 mm, oversize fraction with size of +3.0 mm is sent for grinding into roll crusher, ground product is combined with undersize fraction of size of -3.0 mm of screen, and combined product by means of two serial conveyors is sent to drier. According to wet pattern, at first from receiving hopper by belt conveyor raw materials are sent to scrubber trammel for disintegration and screening according to 10 mm size class for separation of particles with size over 10 mm and production of pulp, which is supplied for wet classification to screen for separation according to size class of 3.0 mm, fraction of +3.0 mm is combined with oversize product produced after trommel, and is sent to dump, undersize product of screen - fraxtion of -3.0 +0 mm is sent to the first contact tub with overflow of slurries for intense washing of processed material from silty and clayey component due to additional supply of water and active mixing. Then pulp is supplied to hydraulic cyclone for separation of slurries and condensation of pulp, from hydraulic cyclone condensed pulp is sent to double-chamber attrition machine, for the first stage of oxide film attrition from surface of sand grain, from attrition machine pulp is supplied into the second contact tub, for the second stage of intense washing of processed material from exposed film and clayey component due to supply of additional water and active mixing. Further pulp is supplied to hydraulic cyclone, where additional separation of slurries and film produced after attrition takes place, as well as pulp condensation, from hydraulic cyclone pulp is supplied to double-chamber attrition machine for the second stage of attrition, on completion of which pulp is supplied into third contact tub for the third stage of intense washing of processed material due to additionally supplied industrial water and active mixing. Further produced pulp is sent to helical classifier, where product is flushed due to additionally supplied additional industrial water, deslimed by grain of 0.1 mm and condensed down to cake condition with moisture of 16-18%, condensed quartz product is sent for filtration onto belt vacuum-filter for removal of water and production of quartz cake with moisture of 6-8%, after belt filter quartz cake for removal of moisture down to 0.5% is sent to drier. Dried quartz product produced by wet and dry technologies is exposed to classification in triple-deck screen to produce sands of various fractions: -3.0 +1.2 mm; -1.2 +0.63 mm and -0.16 +0 mm, sent for finished goods warehouse, and fraction of -0.63 +0.16 mm sent for the 1^st stage of magnetic separation with intensity of magnetic field from 0.45 Tesla, where strong-magnetic particles of treated material, which are sent to dump, then the second stage of magnetic separation is carried out at three-stepped roll magnetic separator, which is intended for removal of dry weakly magnetic materials with intensity of magnetic field on surface of rolls of 1.8-1.9 Tesla, non-magnetic fraction is glass concentrate, which with the help of a system of transport facilities is delivered to fnished goods warehouses. Magnetic fraction of 2^nd stage is collected and sent to dump, with simultaneous operation of the 1^st line in dry mode, and the 2^nd line - in wet mode, finished goods are discharged into separate silos by independent transport patterns.

EFFECT: increased yield and quality of glass concentrate.

2 dwg, 7 tbl