A systematic study of the preparation and metallurgical properties of magnesia flux pellets was used to elucidate the mechanism for oxidation and consolidation occurring during oxidative roasting. The compressive strength of the finished pellets was 3545 N/P. With sufficient basicity and MgO contents, magnetite (Fe)[Fe]O and maghemite γ-FeO with spinel-type crystal structures combined with MgO/CaO to form nonstoichiometric MgFeFeO (0 < x < 1) and CaFeFeO (0 < y < 1). With higher basicity and MgO contents, the participation of CaO/MgO was the driving force for gradient conversion from olivine FeSiO to olivine MgCaSiO. The CaO/MgO combined with magnetite (Fe)[Fe]O and maghemite γ-FeO to form stable (Ca, Mg)FeFeO, CaFeO and CaFeO, thereby inhibiting recrystallization of the pellets and resulting in poorer metallurgical properties of the magnesia flux pellets.

中文翻译：

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关于用于助熔球团生产的 Fe3O4-CaO-MgO-SiO2 系统中 Fe2O3 固结行为的新见解：相变和形态演化


对氧化镁熔剂球团的制备和冶金性能进行了系统研究，以阐明氧化焙烧过程中发生氧化和固结的机理。成品颗粒的抗压强度为 3545 N/P。当碱度和 MgO 含量足够时，尖晶石型晶体结构的磁铁矿 (Fe)[Fe]O 和磁赤铁矿 γ-FeO 与 MgO/CaO 结合形成非化学计量的 MgFeFeO (0 < x < 1) 和 CaFeFeO (0 < y < 1) ）。在较高的碱度和MgO含量下，CaO/MgO的参与是橄榄石FeSiO2梯度转化为橄榄石MgCaSiO的驱动力。 CaO/MgO与磁铁矿(Fe)[Fe]O和磁赤铁矿γ-FeO结合形成稳定的(Ca,Mg)FeFeO、CaFeO和CaFeO，从而抑制球团的再结晶，导致镁熔剂球团冶金性能较差。