Abstract

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.

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