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Effect of Magnetite on Mineral Phase Formation in Sintering Process

机译：磁铁矿对烧结过程中矿物相形成的影响

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Mineral phase formation behavior in the sintering process is one of the most important factors for quality and productivity of iron ore sinter. As resource of high-grade hematite ore is exhausting, it is expected that hematite ore can replaced by magnetite in iron-making. So that, the purpose of this study is to investigate the effect of magnetite on mineral phase formation. To clarify the effects of magnetite on mineral phases formation, sintering experiments using hematite and magnetite reagent were carried out. To research the effects of atmosphere and temperature, samples were sintered under oxidizing (air) and reducing (CO–CO_(2)) atmosphere at 1250°C and 1350°C respectively. The results were analyzed by microscopic observation and image processing. Under both oxidizing and reducing atmosphere, the shapes of each phase after sintering of magnetite samples are likely to hematite samples. From the image processing results, the ratio of each phases formed after sintering of samples were at the same level. So, it is expected that magnetite can be used as raw material instead of hematite in sintering process. Under Air atmosphere, both hematite and magnetite samples formed more calcium ferrite phase when the sintering temperature was higher. Moreover, under Air atmosphere, the calcium ferrite formation ratio of both hematite and magnetite samples was larger than that of under CO–CO_(2) atmosphere. Therefore, it is very important to keep oxidation state in sintering process.
机译：烧结过程中矿物相的形成行为是影响铁矿石烧结矿质量和生产率的最重要因素之一。随着高级赤铁矿矿石资源的枯竭，预计在炼铁中赤铁矿矿石可以被磁铁矿替代。因此，本研究的目的是研究磁铁矿对矿物相形成的影响。为了阐明磁铁矿对矿物相形成的影响，进行了使用赤铁矿和磁铁矿试剂的烧结实验。为了研究气氛和温度的影响，分别在1250°C和1350°C的氧化（空气）和还原（CO-CO_（2））气氛下烧结样品。通过显微镜观察和图像处理来分析结果。在氧化和还原气氛下，磁铁矿样品烧结后各相的形状很可能是赤铁矿样品。从图像处理结果来看，样品烧结后形成的各相之比处于相同水平。因此，期望在烧结过程中磁铁矿可以代替赤铁矿作为原料。在空气气氛下，当烧结温度较高时，赤铁矿和磁铁矿样品均形成更多的铁酸钙相。此外，在空气气氛下，赤铁矿和磁铁矿样品的铁酸钙形成比例均比在CO-CO_（2）气氛下大。因此，在烧结过程中保持氧化态非常重要。

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