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SCIENCE-BASED BACKUP OF THE MINING INDUSTRY
ArticleName Creation of innovative technologies for production of high-quality iron concentrate production in the North West of Russia
DOI 10.17580/gzh.2019.06.07
ArticleAuthor Opalev A. S., Khokhulya M. S., Fomin A. V., Karpov I. V.
ArticleAuthorData

Mining Institute, Kola Science Center, Russian Academy of Sciences, Apatity, Russia:

A. S. Opalev, Deputy Director of Scientific Work, Candidate of Engineering Sciences
M. S. Khokhulya, Leading Researcher, Candidate of Engineering Sciences, mike@goi.kolasc.net.ru
A. V. Fomin, Junior Researcher
I. V. Karpov, Leading Technologist

Abstract

The authors review the available domestic technologies of iron processing with concentrate production at the final stage of dressing. These technologies fail to ensure the required quality of the concentrate by the iron mass fraction. Hematite concentrate production with jigging at processing plant of Olkon is discussed, and proposals are put forward for increased recovery of hematite from tailings of rougher magnetic separation by gravity concentration in thin flows (helical separation, table concentration). The paper describes the results of industrial tests on development of a technology for producing high-quality magnetite concentrates with content of Fetot. 69.5–70.5% at the dressing plants of Olkon and Karelsky Okatysh. It is shown that Olkon can obtain high-quality concentrates after the first grinding stage by the magnetic–gravity separation (MG-separation) from the undersize product of fine vibrating screening containing 45–52% Fetotal. Karelsky Okatysh applies MG-separation as a finishing operation of the prepared concentrate, as an alternative to the flotation re-concentration process, which makes it possible to obtain high-quality concentrates from refractory ore grades of the Kostomuksha deposit. To achieve the objectives, a pilot sample of a magnetic gravity separator MGS-0.5 was used. Based on the results of industrial tests, the authors propose an energy-saving processing technology ferruginous quartzites at Olkon and a process circuit for refractory ore at Karelsky Okatysh. In the gravitational cycle of hematite concentration at the processing plant of Olkon, it is recommended to replace inefficient jigging operation by the two-stage helical separation circuit, including tailings, rougher rough hematite concentrate, final table concentration and and high-intensity magnetic separation. Produced by the developed technology, the hematite concentrate contains about 57% of the mass fraction of hematite iron at recovery of 55% of Fetotal and 75% Fehem, which is 20–55% higher than concentration with jigging.

keywords Magnetite, hematite, quartz, ore, grinding, classification, magnetic–gravity separation, helical separation, concentrate, middlings, tailings
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