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ArticleName Resource-saving technology for hematite concentration from storage mill tailings at Olkon Mining and Processing Works
DOI 10.17580/gzh.2020.09.12
ArticleAuthor Khokhulya M. S., Fomin A. V., Alekseeva S. A., Karpov I. V.

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

M. S. Khokhulya, Leading Researcher, Candidate of Engineering Sciences,
A. V. Fomin, Researcher
S. A. Alekseeva, Researcher
I. V. Karpov, Leading Technologist


Secondary treatment of storage mill tailings is an urgent and promising task, for the quality of produced ore is constantly decreasing while the resources of operating mines and preps are progressively reducing. It is also a paramount objective to mitigate anthropogenic impact on the environment. Mining and processing waste in Russia features a huge mineral resource potential. An important advantage is that the cost of commercial products manufactured from industry waste is significantly lower than in case of minerals extracted by traditional mining methods, since minerals have to pass an energy-intensive grinding process. In this respect, it is of practical relevance to set upon the secondary treatment of iron bearing waste accumulated at Olkon JSC as a result of ferruginous quartzite processing. The article presents the results of laboratory tests on beneficiation of stored waste from the main tailings pond at Olkon JSC with subsequent production of hematite concentrate. The composition of the representative tailings sample is studied. The principal ore mineral containing 8.8% of total iron and 3.7% of hematite iron has been found to be hematite, which is due to the imperfection of the existing technology for separation of hematite concentrate using diaphragm jig machines that fail to ensure efficient separation of fine mineral fractions. The authors have developed a gravitational technology for processing storage waste by screw separation and table concentration. The article justifies introduction of screening and grinding operations for the gravity concentration middlings with the aim of selective dissociation of ore mineral grains. The recommended technology ensures production of hematite concentrate with an iron content of more than 62% at the end-to-end recovery of hematite iron of about 76%. The results confirm exploitability of mining and processing waste and prove producibility of highquality hematite concentrate from ore mill tailings in terms of a certain mining and processing company.

keywords Mining and processing waste, tailings, ferruginous quartzite, hematite concentrate, gravity concentration, screw separation, table concentration

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