Abstract：Sintered slag of pyrite is a kind of solid waste which is forbidden to be imported in China. Since the appearance and element composition are very close to hematite, its attribute should be accurately identified. The sample characteristics were comprehensive characterized in experiments by the means of X-ray fluorescence spectrometry (XRF), X-ray diffraction (XRD), scanning electron microscope (SEM), bulk density analysis and pH detection. Compared with the hematite, the sintered slag of pyrite had the following characteristics: (1) the main elements were Fe, Si, Al, S; S content was usually higher than that of hematite; (2) the phases mainly included hematite (Fe2O3), magnetite (Fe3O4) and silica (SiO2), and a small amount of pyrite (FeS2) as well as a small amount of sulfate phases such as semi-hydrated gypsum (Ca(SO4)(H2O)0.5) and gypsum (CaSO4·2H2O); the sulfates such as gypsum were rare minerals in hematite; (3) SEM and XPS analysis showed that the sample contained many spherical particles of Fe2O3, which were very tiny and often agglomerated; (4) the pH of aqueous leaching solution was 4, showing weakly acidic; (5) the bulk density was less than 1.60 t/m3. The solid waste attribute of sintered slag of pyrite could be accurately identified according to the characteristics above.
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