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用精细还原方法对拜尔法赤泥进行了处理,以铁氧化物的还原度为考察指标,取其影响因素及变化范围为:赤泥颗粒平均尺度1.24~2.43μm、气态还原剂CO-H2、还原温度700~1 000℃、还原时间2~4 h。研究结果表明,还原温度对还原度的影响最为显著,其他因素影响不显著;最佳还原工况为:还原温度1 000℃、赤泥颗粒平均尺度1.236μm、气态还原剂为H2,还原时间4 h;在最佳工况条件下进行还原,还原度高达99%以上;精细还原过程中赤泥颗粒间未发生烧结,有利于采用物理方法将铁元素与其他杂质元素进一步分离;分离铁以后的尾渣可用于炼钢用脱硫渣。
By using the method of fine reduction, the red mud of Bayer process was treated, and the reduction degree of iron oxide was taken as the index. The influence factors and the range of variation were as follows: the average size of red mud particles was 1.24 ~ 2.43μm, the gaseous reductant CO-H2 , Reduction temperature 700 ~ 1 000 ℃, reduction time 2 ~ 4 h. The results show that the reduction temperature has the most significant effect on the reduction degree, while the other factors have no significant effect. The optimum reduction conditions are: the reduction temperature is 1 000 ℃, the average size of the red mud particles is 1.236μm, the gaseous reductant is H2, the reduction time is 4 h. The reduction degree is up to over 99% under the optimal working conditions. No sintering occurs between the red mud particles during the fine reduction process, which is conducive to the further separation of iron and other impurity elements by physical methods. Tailings can be used for steelmaking desulfurization slag.