Abstract
Structural and chemical modifications of tantalite and columbite surfaces, induced by treating the minerals with anolyte—a product derived via the electrolysis of aqueous solutions—and high-voltage electromagnetic pulses, are studied by means of X-ray photoelectron spectroscopy, scanning electron microscopy, energy-dispersive spectroscopy, atomic force microscopy, and electrophoretic light scattering. The mechanical properties of the surfaces are characterized via Vickers microhardness testing. Treating the minerals with anolyte removes iron-containing surface films and leads to considerable conversion of surface-confined Fe(II) species into Fe(III), increasing the differences between the physicochemical and electrical properties of these rare earth minerals. The nonthermal impact of high-voltage pulses results in effective surface softening, a reduction in microhardness, and the disintegration of mineral particles, yielding surface micro- and nanosized phases enriched with iron and oxygen.
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Original Russian Text © V.A. Chanturiya, I.Zh. Bunin, M.V. Ryazantseva, E.L. Chanturiya, E.V. Koporulina, N.E. Anashkina, 2017, published in Izvestiya Rossiiskoi Akademii Nauk, Seriya Fizicheskaya, 2017, Vol. 81, No. 3, pp. 296–301.
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Chanturiya, V.A., Bunin, I.Z., Ryazantseva, M.V. et al. Modifying the physicochemical and electrical properties of tantalite and columbite surfaces under conditions of electrochemical treatment and high-voltage nanosecond pulses. Bull. Russ. Acad. Sci. Phys. 81, 269–274 (2017). https://doi.org/10.3103/S1062873817030066
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DOI: https://doi.org/10.3103/S1062873817030066