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In this paper is carried out a discussion about the influence of mineralogical, physical and chemical characteristics of four low-grade iron ores from Quadrilatero Ferrifero-MG on the performance of inverse cationic flotation to concentrate them. For the three iron ore typologies of lowest iron grade, it was obtained concentrates with Fe and SiO 2 grades with standard sinter feed specifications. The values of selectivity indices (S.I.) between Fe and SiO 2 for Jangada ore, which had higher Fe content (44.04%), are smaller than the values obtained for the others ores, probably due the smaller liberation degree of quartz of this ore compared with the others studied ores.

ASPECTOS MINERALÓGICOS, FÍSICOS E QUÍMICOS NA FLOTAÇÃO CATIÔNICA INVERSA DE MINÉRIOS DE FERRO DE BAIXOS TEORES, DO QUADRILÁTERO FERRÍFERO-MG