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

E. A. Bazarova, Leading Technologist, e-mail: e.bazarova@ksc.ru
G. V. Mitrofanova, Leading Researcher, Candidate of Technical Sciences, Associate Professor, e-mail: g.mitrofanova@ksc.ru
E. V. Chernousenko, Senior Researcher, e-mail: e.chernousenko@ksc.ru

The article presents the results of studies conducted to assess the use of bifunctional complexing compounds with carboxyl and nitrogen-containing functional groups as collector reagents in the flotation of sulfide coppernickel ores. Nitrogen-containing monoderivatives of o-phthalic acid with hydroxamate, hydrazide and amide groups were synthesized and tested in laboratory conditions: monohydroxyamide (MHAPC), monohydrazide (MHAPC), monoamide (MAPC) and butylamide (C4-PC). The use of unsubstituted monoderivatives, firstly, will simplify the synthesis scheme, and secondly, will allow to estimate the contribution of the benzene ring to the flotation properties of the compounds. The synthesis of C4-PC is justified by the fact that its molecule contains the same hydrocarbon radical as the molecule of butyl xanthate, a traditional collector for the flotation of sulfide ores. The complexing properties of the obtained compounds with respect to nickel (II) and copper (II) ions were also studied. The formation of complex compounds was confirmed by IR and Raman spectroscopy by the shift of the characteristic absorption bands of functional groups in the spectra of individual compounds and their complexes. Flotation tests have shown an increase in the extraction of nickel and copper into rough concentrate when using a reagent mode in which monoderivatives of o-phthalic acid are used in combination with xanthate and aerofloat. When using a collecting mixture of xanthate - complexing reagent in various mass ratios, an increase in the extraction of nickel into rough concentrate from 1.1 to 2.2% is observed. The work is aimed at the possibility of expanding the range of flotation reagents for the flotation of finely disseminated copper-nickel ores, as well as sulfide ores of non-ferrous metals, ensuring an increase in process indicators.

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