Irkutsk National Research Technical University (Russia):

Fedotov P. K., Doctor of Engineering Sciences, Associate Professor, Associate Professor, fedotov@istu.ru
Fedotov K. V., Doctor of Engineering Sciences, Professor, Head of Chair, fedotov@istu.edu
Burdonov A. E., Ph. D. in Engineering Sciences, Associate Professor, slimbul@inbox.ru

Far Eastern Federal University (Russia):

Petukhov V. I., Doctor of Engineering Sciences, Professor, Deputy Director of the School of Engineering Development, Petukhovv@mail.ru

The Dzhidinsky tungsten-and-molybdenum mining and concentration complex dumped tailings composition and structure were studied. It was established, that the TSF is formed with non-consolidated poorly graded sand, consisting of angular fragments of mostly quartz and feldspar, less frequent dark-colored minerals, muscovite, fluorite, hubnerite, scheelite, pyrite, sphalerite, galenite, fahl ores, chalcopyrite, molybdenite, bismuth sulphosalts. Fragments larger than 0.25 mm predominate (over 60 %), among them, fragments of 0.25–0.5 mm size account for 16.6–31.8 %. Fine sands (–0.08 mm) mass fraction varies from 6.9 to 25.4 %. The deposit is characterized by presence of tungsten (37.85 %) in medium size fractions of –1+0.5 and –0.5+0.2 mm, with metal grade of 0.05 and 0.05 %, respectively. Gold is concentrated mostly in fine size fractions of –0.2+0 mm, with that, most productive size fraction is –0.071 mm (48.07 % Au). It was established, that main losses of tungsten and gold in the Dzhidinsky tungsten-and-molybdenum MCC tailings are related to small size fractions and gangue-grain aggregate particles. From the obtained results follows that 62.8 % of free hubnerite grains and 64.5 % of free liberated scheelite grains may be recovered from tailings of existing size. On the basis of the studies, performed by NTL «TOMS» and the TsNIGRI (the Central Geological Research Institute for Nonferrous and Precious Metals) regarding the physicotechnical and processing properties of the Dzhidinsky tungsten-and-molybdenum MCC aged dumped tailings, a processing flow sheet is proposed for their beneficiation. The main principle of this flow sheet is gravity concentration of material (sands) with production of tungsten rougher gravity concentrate with its subsequent final concentration by means of flotation and electromagnetic methods. The developed technology for aged dumped tailings processing may be also applied with respect to dumped tailings accumulated at the TSFs of the Primorsky MCC, the Lermontovsky MCC, the Tyrnyauzsky MCC, the Novoorlovsky MCC, etc.

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