Improvement of the quality of iron concentrate by separate beneficiation of two technological grades

A flow chart with separate beneficiation of two technological grades obtained after the first stage of grinding was investigated. The flow chart was tested under laboratory conditions for titanomagnetite ore and ferruginous quartzites. A modified drum magnetic separator with an increased bath depth was used to separate the MMS-I industrial product into grades 1 (rich) and 2 (poor). A special feature of the separator is the reduced magnetic field induction at the bottom of the bath (0.005 T) with the standard magnetic field induction on the drum surface. When processing titanomagnetite ore according to the scheme with separate beneficiation of technological grades 1 and 2, there was an increase in the iron content in the total concentrate by 1.99 % (from 63.4 to 65.39 %) compared to the standard scheme. The iron and silicon dioxide content in the concentrate obtained from grade 1 was 66.6 % and 1.21 %, respectively. When processing ferruginous quartzites according to the developed scheme, the iron content in the total concentrate increased by 1.57 % (from 65.9 to 67.47 %) compared to the standard scheme. The iron content in the concentrate obtained from grade 1 was 69.98 %. The use of the scheme with separate beneficiation of process grades led to an increase in the iron content in the total tailings by 0.54 % (from 6.38 to 6.92 %) for titanomagnetite ore and by 0.56 % for ferruginous quartzites (from 26.64 to 27.2 %).