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MAGNESIUM, TITANIUM, RARE METALS, SEMICONDUCTORS
ArticleName Estimation of efficiency of preliminary mechanical activation of low-grade tungstenite concentrate by X-ray diffraction analysis. Part 2
ArticleAuthor Bogatyreva E. V., Ermilov A. G.
ArticleAuthorData

Chair of Non-Ferrous Metals and Gold, National University of Science and Technology “MISiS”, Moscow, Russia:

E. V. Bogatyreva, Assistant Professor, e-mail: Helen_Bogatureva@mail.ru
A. G. Ermilov, Ex-employee

Abstract

This work demonstrates the possibility of forecasting of reactivity of low-grade tungstenite concentrate after preliminary mechanical activation, using X-ray analysis. Application of chemical and physical methods leads to disintegration of the sample and requires significant amounts of activated material. That's why, application of X-ray analysis is more efficient. This work presents X-ray diffraction analysis for unactivated and activated low-grade tungstenite concentrate with different grain size. According to X-ray diffraction analysis, there was estimated the influence of the following energies on total energy, stored during mechanical activation:
— energy, spent for changing of interplanar spacing of crystal lattice (ΔEd);
— energy, stored in the form of freshly formed crystallite surfaces (ΔEs);
— energy, stored in microstrain form (ΔEε).
This approach is unique, because it offers both possibility of evaluation of energy, stored in the system, and forecasting of reactivity of materials from X-ray diffraction analysis, without chemical or physical characterization, with typically lead to the sample disintegration and requires significant amounts of activated material. Process tests confirmed the foregoing, because extraction degree depended not on the total stored energy, but on the type of energy. Research results confirmed the fact that the energy, stored in the forms of ΔEs and ΔEε during mechanical activation, makes an influence on leaching behavior of low-grade tungstenite concentrate. There was studied the influence of ΔEs and ΔEε in tungstenite phase during mechanical activation on WO3 extraction into solution through low temperature alkaline leaching. Evaluation of reactivity of milled tungstenite concentrate from X-ray diffraction analysis allowed to optimize mechanical activation conditions and to reach tungsten extraction into solution at the level of 99%.

keywords Tungstenite concentrate, mechanical activation, alkaline leaching, X-ray analysis, intensification, coarseness of concentrate, activation energy, stored energy
References

1. Bogatyreva E. V., Ermilov A. G., Sviridova T. A., Savina O. S., Podshibyakina K. V. Neorganicheskie materialy — Inorganic materials. 2011. Vol. 47, No. 6. pp. 877–883.
2. Voldman G. M., Zelikman A. N. Teoriya gidrometallurgicheskikh protsessov (Theory of hydrometallurgical processes). Moscow : Intermet Engineering, 2003. 464 p.

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