COMPLEX PROCESSING OF IRON ORE DRESSING WASTES Russian patent published in 2014 - IPC B03B9/06 

FIELD: process engineering.

SUBSTANCE: invention relates to processing of secondary resources at concentration of iron ore wastes at dressing factories. Proposed method comprises crushing of wastes, separation of magnetic pores by magnetic separators, separation of and processing of heavy ores, separation and processing of light and nonmagnetic ores, separation and processing of soaking ores. Wastes are processed in two steps. At first dry step, primary separation of magnetic ores is performed by drum-type magnetic separators. Nonmagnetic ore is sized at classifier to +2.0 mm and fed to crushing. After crushing is fed on belt conveyor and mixed with -0.2 mm size ore after classifier to perform secondary separation of magnetic ore by said separators and feed for processing and pelletizing. Nonmagnetic ore is fed to second, hydraulic processing step. Thereafter, ore is discharged into inclined vibratory flute, along with water, to separate by gravity in made pulp the nonmagnetic ores by particle density and size. For this, hydraulic flow is uniformly increased in height in vibratory flute. Differentiated flow is directed to intake funnels with discharge dewatering flutes. The latter are inclined at natural slope angles to bypass dewatered loose ore in dewatering bins with feeders. Therefrom, dewatered ore is intermittently fed to separators to divide ore particles into heavy, noble and rare earth components their slimes being discharged for refining. Gob from separator, water from dewatering bins and flutes and flow not trapped by funnels is fed into head part of dewatering complex for deposition, discharge and dewatering of solids in sand dewatering bin and, thereafter, to packing. Unsettled parts with soaking colloidal particles by fed to accumulating dewatering complex head to be settled, discharged, partially dewatered and used as clay. Clarified waste is fed by slime pump to second step head part. Lack of water in closed cycle of water supply is replenished from external source.

EFFECT: higher efficiency of extraction of useful components.

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