Arsentyev V. A.,  Director on Investigations and development, REC «Mekhanobr-tekhnika» (Russia); Azbel Yu. I., Chief Specialist, REC «Mekhanobr-tekhnika» (Russia), azbel@yandex.ru; Dmitriev S. V., Leading Engineer, REC «Mekhanobr-nekhnika» (Russia), dmitriev_sv@npk-mt.spb.ru; Mezenin A. O.,  Postgraduate, Saint Petersburg State Mining University (Russia), anton_mezenin@mail.ru; Andreev Ye. Ye.,  Associate Professor, Saint Petersburg State Mining University (Russia), opiopi@bk.ru.

The results of finely disseminated hematite ore dry magnetic concentration are presented. The ore preparation for concentration with separation of different size fractions is described. Effect of vibratory fluidization upon metallurgical performance, as well as feed moisture content effect upon concentration efficiency with fluidization, are considered. Dry magnetic concentration was performed on drum separator PBSTs-30/5 and on electromagnetic separator EVS-15/5.n Specific magnetic susceptibility χ of starting feed and different separation products, measured by Faraday method, is presented. Relationship between iron recovery into magnetic product and iron content in starting samples, as well as vibrofeeder chute vibrations amplitude, has been studied. It has been established, that iron recovery into magnetic product with quiet transport is appreciably lower, than with vibratory fluidization. To a lesser degree, vibratory fluidization affects iron content in magnetic product. It has been established, that with feed moisture content over 3.6 %, separation is impossible due to particles clinging and disturbance of their transport on vibrofeeder chute. The obtained results corroborate the essential advantage of ferrous metals weakly-magnetic ores separation in fluidization layer, as compared with quiet transport.

1. Mezenin A. O., Andreev Ye. Ye., Dmitriev S. V. Obogashchenie Rud, 2011, No 3, p. 31–34.
2. Stepanyan A. S., Dmitriev S. V., Grigoriev I. V., Mezenin A. O. Obogashchenie Rud, 2011, No 4, p. 37–41.