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Mineralogical Magazine; June 2000; v. 64; no. 3; p. 497-505
© 2000 Mineralogical Society of Great Britain and Ireland
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Correlation between reduciblity and composition of natural wolframite in Argentinian ore deposits

I. L. Botto1,*, V. L. Barone1, M. A. Sanchez2 and I. B. Schalamuk3

1 Centro de Química Inorgánica (CEQUINOR-CONICET), Facultad de Ciencias Exactas, Universidad Nacional de La Plata, C.C. 962, La Plata (1900), Argentina
2 CINDECA-CICPBA, La Plata (1900), Argentina
3 Instituto de Recursos Minerales (INREMI) and Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, La Plata (1900), Argentina

* E-mail: botto{at}dalton.quimica.unlp.edu.ar

Thermal reduction in wolframite (composition: Fe1–xMnxWO4 (0.08<x<0.87)) from different deposits in Argentina, was analysed using a temperature-programmed reduction (TPR) technique. X-ray powder diffraction analysis (XRPD), vibrational spectroscopy (IR and Raman), scanning electron microscopy (SEM) and electron microprobe analysis (EDAX) were used to assess the relationship between reactivity degree in a reducing atmosphere (H2 10% – N2 90%) and chemical composition of wolframite. Similar studies were carried out with other related minerals, especially the ones found in natural deposits as alteration or association products. Stability of the solid solution serial members is correlated with redox properties of divalent cations.

KEYWORDS: wolframite, tungsten, Argentina, reducibility






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