Classifica?§?￡o de min??rio de ferro por DRX-Rietveld e an??lise de agrupamento

摘要

This study establishes a routine for quantitative phase analysis by X-ray diffraction (XRD-Rietveld) in iron ore samples. Studied samples came from Quadril??tero Ferr?-fero, Southeastern Brazil, and are mainly composed by hematite, magnetite, goethite, quartz and kaolinite, being divided in three clusters cluster 1 (n = 8), characterized by the presence of hydrated phases goethite (25 to 72 wt %), kaolinite (& 25 wt %) and gibbsite (& 10 wt %), plus hematite (7 to 54 wt %) and quartz (2 to 19 wt %); cluster 2 (n = 16), which consists of hematite (22 to 81 wt %) and quartz (2 to 58 wt %) and smaller proportions of goethite (& 22 wt %) and kaolinite (& 13 wt %); and cluster 3 (n = 3), that has a predominance of quartz (62 to 74??wt??%)??and??smaller??amounts??of??hematite??(17??to??33??wt??%)??and??kaolinite??(&??5??wt??%).??Classification??of??ores??by??XRD-Rietveld?? and??cluster??analysis??is??a??fast,??low-cost??and??reliable??option??for??substituting??ore??classification??with??chemical??analysis.