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Phase transformations during the oxidation of fayalite (Fe 2 SiO 4 ) are investigated for the recovery of iron from iron-rich nickel slag by oxidation-magnetic separation. The proportions of various phases calculated by FactSage 7.1 show that augite and spinel are the major phases in the FeO-SiO 2 -MgO-CaO-O 2  system in air atmosphere. The decreased content of Fe 2+ shows that Fe 2 SiO 4  is gradually oxidized into Fe 3 O 4  with increasing oxidation time. XRD patterns demonstrate that Fe 3 O 4 and Ca(Mg,Fe)Si 2 O 6  are the dominant phases after the oxidation. The Mössbauer spectrum indicates that 93.1 wt.% of iron in oxidized nickel slag is in magnetic minerals, while a limited amount of iron is contained in non-magnetic minerals. Ca(Mg,Fe)Si 2 O 6  was formed during the heating stage in Ar atmosphere through the polymerization of SiO 4  4- and also via peritectic reaction after the isothermal oxidation.

Phase transformations during the oxidation of fayalite in iron-rich nickel slag