Transformation process of siderite under the conditions of coal-based direct reduction
Transformation process of siderite under the conditions of coal-based direct reduction
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发表时间：
2012
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通讯作者：
Xu Yan
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作者：
Xu Yan
为了研究菱铁矿在强还原气氛下加热过程中的转化过程和转化途径，采用热重分析、X射线衍射（XRD）、扫描电镜（SEM）、扫描电子显微镜（SEM）等分析手段，对甘肃嘉峪关菱铁矿在煤基直接还原条件下的热行为进行了研究，研究了不同焙烧条件下焙烧产物中铁矿物的存在形式，结果表明菱铁矿转化为铁的途径为FeCO_3 → Fe_3O_4 →FeO→Fe，菱铁矿的转化过程为FeCO_3 → Fe_3O_4 →FeO→Fe。包括两个阶段：菱铁矿的热分解阶段在556.6 ℃结束，产物为Fe3O4，铁氧化物的还原在556.6 ℃后开始，在1200 ℃完全结束，最终产物为金属铁。
In order to research the transformation process and transformation path of siderite during heating process in strong reduction atmosphere,the thermal behaviors of siderite from Jiayuguan Mine in Gansu Province of China under coal-based direct reduction conditions were studied by thermogravimetry,X-ray diffraction(XRD),scanning electron microscopy(SEM),etc.The existence form of iron minerals in roasting products in different roasting conditions was observed.It is shown that the path of transforming siderite into iron is FeCO3→Fe3O4→FeO→Fe.The transformation process includes two stages: siderite decomposition and iron oxide reduction.The thermal decomposition stage of siderite finishes at 556.6 ℃,and the product is Fe3O4;the reduction of iron oxides comes out after 556.6 ℃ and finishes completely at 1 200 ℃,and the final product is metallic iron.