The mechanism of structural and chemical transformations of tantalite, columbite, and zircon surfaces in the process of acid and electrochemical treatment of mineral suspensions

The results of experimental studies and scientific substantiation of an effect of directional change in the chemical and phase composition of the surface and increase in the contrast of physicochemical and electrical properties of tantalite, columbite, and zircon in the course of treatment with anol...

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Bibliographic Details
Published in:Doklady earth sciences 2017-04, Vol.473 (2), p.472-476
Main Authors: Chanturiya, V. A., Ryzantseva, M. V., Chanturiya, E. L., Bunin, I. Zh, Samusev, A. L.
Format: Article
Language:English
Subjects:
Acids
Activation analysis
Anolytes
Chemical treatment
Composition effects
Defects
Destruction
Dissolution
Dissolving
Earth and Environmental Science
Earth Sciences
Electric properties
Electrical properties
Electrochemistry
Geochemistry
Hydrochloric acid
Iron
Leaching
Metals
Minerals
Oxidation
Oxygen
pH effects
Phase composition
Silicates
Solutions
Surface boundary layer
Surface chemistry
Surface layers
Transformations
Vacancies
Zircon
Zirconium
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Summary:The results of experimental studies and scientific substantiation of an effect of directional change in the chemical and phase composition of the surface and increase in the contrast of physicochemical and electrical properties of tantalite, columbite, and zircon in the course of treatment with anolyte (pH < 5) and a hydrochloric acid solution (HCl, pH 3–3.5) are reported. The mechanism of structural and chemical transformations of the mineral surface in the process of leaching with acid solutions are studied. This mechanism includes the activation of oxidation of iron atoms in the surface layer of tantalite and columbite with the transition from Fe(II) to Fe(III), destruction of the zircon surface with the formation of oxygen–vacancy defects of the SiO 3 2- - and SiO 2 0 -types, and intense dissolution of iron- and silicate-bearing films from the surface of rare-metal minerals.
ISSN:1028-334X
1531-8354
DOI:10.1134/S1028334X1704016X