METHOD OF PROCESSING OF IRON-ORE PRODUCTION WASTES Russian patent published in 2002 - IPC

FIELD: processing of industrial wastes; processing of crushing-and-concentrating plants and overburden dumps; ferrous metallurgy. SUBSTANCE: proposed method consists in gravity concentration through segregation of wastes; fractions more than 100 mm, 100 mm, 60 mm and then waste fraction more than 100 mm are subjected to crushing to size of 0 to 100 mm, after which magnetic separation of fractions of wastes is performed separately: for fractions of wastes of 100 mm first low-gradient magnetic separation is performed at separation of said iron concentrate, then high-gradient magnetic separation is performed at separation of building material in form of broken-stone ballast and sub-standard magnetic product which is combined with fraction of 60 mm of waste and is subjected to crushing to size of 25 mm and low-gradient and high-gradient magnetic separation is performed for fraction of 25 mm at separation of building broke stone and sub-standard magnetic product which is subjected in its turn to crushing to size of 0 to 10 mm combining it with fraction of 0-10 mm of wastes, after which poly-gradient magnetic separation is conducted through simultaneous action of high-gradient magnetic field of stationary magnetic system and high-gradient magnetic field of alternating polarity and variable direction of concentrates of magnetic flux; building material is separated in form of screenings for filling used open pits and sub-standard magnetic product directed for low-gradient magnetic separation at separation of product for extraction of iron in sintering process and sulfide product directed for extraction of iron in sintering process and sulfide product directed for extraction of other valuable components by floatation method. EFFECT: enhanced efficiency; enhanced ecological safety due to optimal modes of separation. 2 cl, 1 dwg