Abstract

CHOQUE FERNANDEZ, Oscar Jesús; CASSEB GUIMARAES, Emanuelle  and  POLLMANN, Herbert. Phases quantification by Rietveld Methode in copper ore processing products of Sossego mine, Carajás, Brazil. Rev. Met. UTO [online]. 2014, n.35, pp. 3-12. ISSN 2078-5593.

The characterization and quantification of phases in copper ore processing products of Sossego mine, Carajás were carried out. The work focused on the application of X-ray diffraction (XRD) and Rietveld method to quantification of the phases. The Rietveld method uses a least squares approach to refine a theoretical line profile until it matches the measured profile, using a set of model parameters. Were refined the unit cell, 26 displacement, background profile and texture parameters. The accuracy of the Rietveld method was compared with other analytical techniques, as chemical analysis and image analysis. Chalcopyrite and pyrite are the main sulfides and Mg-hornablenda, albite, microcline, clinochlore, magnetite and quartz are the gangue minerals, being the main phases in the processing products of copper mine. These phases properly quantified by the Rietveld method show small percentage variations between each sample. The quantification of phases indicated by the Rietveld method is consistent with the results obtained in other tests.

Keywords : Copper; Sossego; X-ray diffraction; Rietveld method.