Moscow University of Science and Technology “MISiS”, Moscow, Russia:
V. A. Ignatkina, Professor of the Department of Mineral Processing, e-mail: woda@mail.ru
V. A. Bocharov, Professor of the Department of Mineral Processing
A. A. Kayumov, Post-Graduate Student of the Department of Mineral Processing, e-mail: maliaby_92@mail.ru
M. Aksenova, Masters's graduate of the Department of Mineral Processing

Pyrite is the main mineral of pyrite copper ores that due to the high initial content in ore (in comparison with sulfides of non-ferrous metals and rock minerals) and technological features affects in mineral separation efficiency of non-ferrous and noble metals. Technological properties of pyrite depend on its texture-structural varieties; content of admixtures (copper, gold, zinc, plumbum); size; type of inclusion; bonding with other sulfides; compound of isomorphic admixtures of rare-earth minerals (thallium, gallium, selenium, cobalt, germanium). The relations between pyrite’s flotation activity and pH (7; 9; 11) at presence of modifiers (sodium sulfite, zinc sulfate, sulfite and sodium bisulfide, sodium cyanide) which, with the exception of zinc sulphate at a concentration of more than 5·10^–3 g-eq/l, is depressed in a lime environment (at pH > 11) pyrite flotation. The deep depression of pyrite requires much less amount of sodium cyanide than sodium sulfide. Pyrite’s flotation activity from mixture (chalcopyrite and sphalerite) is higher than monomineral fraction. The type of sulfhydryl collector (butyl xanthate, diisobutyl dithiophosphate, isopropyl-O-N-methylthionocarbamate (ITС), Aero 5100, M-TF) with aeration differently affects in pyrite’s flotation activity. It leads to an increased specific flotation rate of pyrite by thionocarbamates in some aeration conditions.
This work was carried out with the financial support of the Russian Foundation for Basic Research, project No. 17-05-00890.

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