Institute of the Comprehensive Exploitation of Mineral Resources of the Russian Academy of Sciences (Russia):

Chanturiya V. A., Member of the Russian Academy of Sciences, Doctor of Engineering Sciences, Chief Researcher, vchan@mail.ru
Chanturiya E. L., Doctor of Engineering Sciences, Chief Researcher, elanachan@mail.ru
Ryazantseva M. V., Ph. D. in Engineering Sciences, Senior Researcher
Khabarova I. A., Ph. D. in Engineering Sciences, Senior Researcher

The results of the comprehensive experimental studies related to the effect of directed changes in sorption properties of tantalite, columbite, zircon, quartz and feldspar, as well as in composition of caprylhydroxamic acid compounds, formed on their surface, and also the minerals’ flotability in the process of their treatment with water electrolysis acid product — anolyte (pH 2.5) and hydrochloric acid solution (HCl, pH 2.5), are presented. By means of infrared spectroscopy, an increase in tantalum-niobates surface sorption activity, resulting from treatment with anolyte by virtue of transition of Fe(II) into Fe(III) in the minerals’ surface layer and formation of stronger ferric hydroxamates, was established. With that, regardless of caprylhydroxamic acid chemical sorption on surface of zircon, quartz and feldspar, amount of attached collector is decreased. The character of caprylhydroxamic acid sorption on surface of columbite, tantalite and zircon under the conditions of pretreatment with anolyte is corroborated by the results of the minerals’ surface hydrophobic property estimate, as well as by the results of flotation. Surface hydrophobicity of columbite and tantalite is increased by 8–12 %, and that of zircon – is decreased by 15–23 %. Pretreatment in anolyte permits to increase tantalum-niobates recovery by 10 % and decrease zircon and feldspars recovery by 15 and 10 %, respectively. The obtained data open up a new opportunity for separation of tantalum-niobium and zircon concentrates of required grade by means of flotation-magneticand-
gravity separation flow sheet.

The studies were performed with the aid of the Russian Science Foundation Grant (Project No. 16-17-10061).

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