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    • 70. 发明授权
    • Autogenous roasting of iron ore
    • 自动焙烧铁矿石
    • US5244494A
    • 1993-09-14
    • US851964
    • 1992-03-16
    • Patrick E. Cavanagh
    • Patrick E. Cavanagh
    • C01G49/06C22B1/04
    • C22B1/04
    • Iron ore concentrate is converted to magnetic gamma hematite in an autogenous roasting operation which is self-sustaining. The iron ore concentrate is preheated and contained magnetite is oxidized to hematite. Hematite is reduced to magnetite using carbon monoxide. After cooling, the magnetite is oxidatively exothermically converted to magnetic gamma hematite. The thermal energy resulting from the latter step is recycled to the preheating and reduction steps while thermal energy resulting from the cooling step also is recycled to those steps. The magnetic gamma hematite may be subjected to magnetic separation to produce a very low silica high purity iron oxide concentrate, which may be blended with high silica concentrate to provide a pellet feed for making blast furnace feed pellets.
    • 在自发焙烧操作中,铁精矿转化为磁性γ赤铁矿,这是自给自足的。 铁精矿被预热,含铁矿被氧化成赤铁矿。 使用一氧化碳将赤铁矿还原成磁铁矿。 冷却后,磁铁矿氧化放热转化为磁性γ赤铁矿。 由后一步产生的热能再循环到预热和还原步骤,而由冷却步骤产生的热能也被再循环到那些步骤。 可以对磁性γ赤铁矿进行磁选分离以产生非常低的二氧化硅高纯度氧化铁浓缩物,其可与高二氧化硅浓缩物混合以提供用于制备高炉进料颗粒的颗粒进料。