CAJ | 학술논문

通过超细粒度拜尔法赤泥的氢还原实验考察了800～1000℃还原温度条件下还原时间对还原率的影响，并根据实验结果对超细粒度铁氧化物还原动力学模型进行了计算分析。研究结果表明，还原时间长、还原温度高对应的还原率高，在1000℃条件下还原70 min还原率高达99%以上，还原过程中赤泥颗粒间未发生烧结，有利于将铁元素与其他杂质元素分离；对于超细粒度拜尔法赤泥的还原，影响反应进行的限制性因素为界面反应；常用未反应核模型不能精确描述超细粒度铁氧化物的还原率和还原时间的变化关系，研究修正了未反应核模型，使之适用于描述超细粒度下铁氧化物的还原过程。
통과초세립도배이법적니적경환원실험고찰료800～1000℃환원온도조건하환원시간대환원솔적영향，병근거실험결과대초세립도철양화물환원동역학모형진행료계산분석。연구결과표명，환원시간장、환원온도고대응적환원솔고，재1000℃조건하환원70 min환원솔고체99%이상，환원과정중적니과립간미발생소결，유리우장철원소여기타잡질원소분리；대우초세립도배이법적니적환원，영향반응진행적한제성인소위계면반응；상용미반응핵모형불능정학묘술초세립도철양화물적환원솔화환원시간적변화관계，연구수정료미반응핵모형，사지괄용우묘술초세립도하철양화물적환원과정。
The reduction experiments of ultrafine particles Bayer red mud by H2 were carried on for researching the effect of reduction time on the reduction rate under the reduction temperature scope of 800~1 000℃. According to the experimental results, the calculation analysis of dynamic model for the reduction of ultrafine particle iron oxides was given. The results were as follows. The longer reduction time and higher reduction temperature, the corresponding reduction rate is higher. When the reduction time was 70 min under the reduction temperature of 1 000℃, the reduction rate was higher than 99%. During the precise reduction process, there wasn't sintering appearance between particles, making it possible to separate the iron from other elements. For the reduction of ultrafine particle Bayer red mud, the restrictive step effecting reaction is interfacial reaction. The common unreacted core model can't describe the relation between the reduction rate of ultrafine particle iron oxides and the reduction time accurately, and study modified unreacted core model, applicable for describing the reduction process of ultrafine particle iron oxides.