Energy Effect on the Structural and Chemical Transformations of Base Minerals of Eudialyte Concentrate in Nitric Acid Leaching
V. A. Chanturiya, E. V. Koporulina, V. G. Minenko, A. L. Samusev
Research Institute for Comprehensive Exploitation of Mineral Resources, Russian Academy of Sciences, Moscow, 111020 Russia
Keywords: азотнокислотное выщелачивание, эвдиалитовый концентрат, морфология, фазовый состав, цирконий, редкоземельные металлы, механоактивация, энергетические воздействия, Nitric acid leaching, eudialyte concentrate, morphology, phase composition, zirconium, rare-earth metals, mechanical activation, energy effects
Abstract
Using the methods of X-ray phase analysis, analytical scanning electron microscopy and inductively coupled plasma mass spectrometry, the influence of preliminary energy effects on transformations of eudialyte concentrate base minerals during nitric acid leaching, their micromorphology, and phase composition of the surface was studied. It was established that preliminary mechanical activation of the concentrate provides a 34-45% increase in the extraction of zirconium and the amount of rare-earth metal oxides into pregnant solution. Electrochemical treatment of mineral suspension during nitric acid leaching and, to a greater extent, ultrasonic effects contribute to an additional increase in the extraction of these elements into pregnant solution by 12-23% due to the cleaning of mineral grain surface from amorphous phases and formation of structural inhomogeneities.
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