FIELD: technological processes.
SUBSTANCE: invention relates to enrichment of minerals, in particular, to extraction of heavy minerals from sands containing magnetic particles. Method of beneficiation of gold-containing sands includes their disintegration and screening, extraction of magnetic fraction, gravity concentration, intermediate sieving, additional extraction of fine fractions of valuable component into concentrate. Concentration of gravity recovery concentrates and add-extracted fine fractions of valuable component are combined into one product, which is directed for further cleaning at sluice attachment by means of magnetisation and demagnetisation of product by constant field of high intensity and gradient, created by installation of magnetizing and demagnetizing rows of permanent magnets, located from below attachment chute across transported flow. Concentrate separated after cleaning is separated into a rich product and a non-productive fraction of tails. Latter is directed to further successive separation of magnetic and electroconductive fractions by separation. Separated magnetic fraction is returned for reuse in the process of additional extraction of fine classes of the valuable component. Electroconductive fraction containing clusters of bound gold with quartz and sulphide minerals is directed for grinding, subsequent classification with extraction of sink and sands. Draining is returned to circulation, and sands are directed for cyanidation of gold with their intensive mixing. Cyanination tails are sent for decontamination, and working solutions – for subsequent sorption recovery of gold. Attachment magnetic field is created by arrangement of permanent magnets with alternating polarity with number of magnetizing rows of at least two. Demagnetisation of the product is carried out at the outlet of the sluice attachment at concentrate ripening.
EFFECT: higher efficiency of sands dressing.
3 cl, 4 dwg, 1 tbl
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