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

Chanturiya  V. A.  Ryzantseva  M. V.  Chanturiya  E. L.  Bunin  I. Zh.  Samusev  A. L. 《Doklady Earth Sciences》2017,473(2):472-476

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 ^2-₃ - and SiO ⁰₂ -types, and intense dissolution of iron- and silicate-bearing films from the surface of rare-metal minerals.

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Physicochemical and Energy Impact on the Process of Leaching of a Eudialyte Concentrate     

Chanturiya  V. A.  Minenko  V. G.  Samusev  A. L.  Koporulina  E. V.  Kozhevnikov  G. A. 《Doklady Earth Sciences》2022,505(2):534-542

Doklady Earth Sciences - The results of an experimental study of alkaline decomposition of eudialyte concentrate when exposed to physicochemical and energy impacts prior to the subsequent acid...  相似文献