Correlation between reduciblity and composition of natural wolframite in Argentinian ore deposits

Thermal reduction in wolframite (composition: Fe1-xMnxWO4 (0.08<x<0.87)) fr om different deposits in Argentina, was analysed using a temperature-progra mmed reduction (TPR) technique. X-ray powder diffraction analysis (XRPD), v ibrational spectroscopy (IR and Raman), scanning electron microscopy (SEM) and electron microprobe analysis (EDAX) were used to assess the relationshi p between reactivity degree in a reducing atmosphere (H-2 10% - N-2 90%) an d chemical composition of wolframite. Similar studies were carried out with other related minerals, especially the ones found in natural deposits as a lteration or association products. Stability of the solid solution serial m embers is correlated with redox properties of divalent cations.