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在实验室模拟高炉条件下研究球团还原过程,采用X射线衍射仪(XRD)测定球团在不同还原温度下的物相组成,通过光学显微镜和扫描电镜(SEM)观察球团还原过程中微观结构的变化。研究结果表明:球团在还原过程中出现分层现象,由低温下外层磁铁矿-核心赤铁矿逐渐转变为高温下外层金属铁-核心浮士体;球团还原停滞现象首先由生成的渣膜包裹铁氧化物颗粒,引起还原速率降低,之后生成密实金属铁壳阻碍还原气体进入球团内部,进一步减慢还原速率。
The pellet reduction process was studied in a laboratory simulated blast furnace. The phase composition of the pellets was measured by X-ray diffraction (XRD) at different reduction temperatures. The microstructure of pellets was observed by optical microscope and scanning electron microscope (SEM) Structural changes. The results show that the pellets delaminate during the reduction process, and gradually transform from the outer magnetite-core hematite to the outer metallic iron-core buoyant at high temperature. The pellet restrain phenomenon firstly consists of The resulting slag film encapsulates the iron oxide particles, causing a reduction in the reduction rate, followed by the formation of a dense metallic iron shell impeding the reduction gas from entering the interior of the pellet, further slowing down the reduction rate.