"Metalloinvest" Holding Company (Moscow, Russia)

R. I. Ismagilov, Director on Technical Development

National University of Science and Technology MISIS (Moscow, Russia)
T. I. Yushina, Cand. Eng., Associate Prof., Head of Dept. of Mineral Processing and Technogenic Raw Materials, e-mail: yuti1962@mail.ru
A. M. Dumov, Cand. Eng., Associate Prof., Dept. of Mineral Processing and Technogenic Raw Materials

The paper presents the review of the main technologies for concentration of rich iron ores and factors having influence on selection of the technology and concentration parameters. The most important technological parameters at the leading concentration plants (both abroad and in Russia), which are processing rich iron ores, are observed. It is shown that even ores with Fe content more than 65 % are subjected to concentration abroad. At present time, only 15 % of iron ores in CIS can be directed to metallurgical processing without concentration, 65 % of iron ores are concentrated via simple routes, but 20 % of iron ores require use of combined concentration methods. The aim of this work was study of substantial composition of large-lump hematite ore at Mikhailovskoe deposit and determination of possible technological pre-concentration methods for rise of Fe content in sinter ore up to 53-55 %. Examination of mineral composition of grab and bulk samples displayed that oxidized ferriferous quartzites are characterized by thin-layered texture with alteration of ore-free layers and interlayers, which are enriched by hematite. Coarseness less than 2 mm for more than 45 % of material proved presence of essential amount of slightly structured mineral differences and high oxidation degree. The experiments on determination of possibility of technological preliminary concentration of large-piece rich hematite ore were carried out using gravitation, X-ray absorption (XRT) and electromagnetic (EM) methods, dry magnetic separation in weak and strong field. It was shown that preliminary concentration of large-piece rich hematite ore from Mikhailovskoe deposit is impossible due to the features of mineral composition (wide range of porosity of ore lumps, Fe content outside the ranges of XRT method use, presence of essential amount of martite with relict magnetite nuclei etc.).

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