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菱鐵礦在煤基直接還原條件下的轉化過程

Transformation process of siderite under the conditions of coal-based direct reduction

  • 摘要: 為研究菱鐵礦在強還原氣氛下加熱過程中鐵礦物的轉化過程和規律,采用熱重分析、X射線衍射和掃描電鏡等手段研究了嘉峪關某菱鐵礦石在煤基直接還原過程中菱鐵礦的熱行為和不同條件下焙燒產物中鐵礦物的存在形式等.結果表明,菱鐵礦在煤基直接還原條件下轉化為金屬鐵的歷程為FeCO3→Fe3O4→FeO→Fe.轉化過程分為菱鐵礦分解和鐵氧化物還原兩個階段;熱分解階段在556.6℃時基本結束,最終產物為Fe3O4;鐵氧化物的還原階段在556.6℃以后、1200℃時完全結束,最終產物為金屬鐵.

     

    Abstract: 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.

     

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