【作者】 孙永升； 韩跃新； 栗艳锋； 李艳军；

【Author】 Sun Yongsheng;Han Yuexin;Li Yanfeng;Li Yanjun;School of Resources and Civil Engineering, Northeastern University;

【机构】 东北大学资源与土木工程学院；

【摘要】 采用深度还原高效分选新技术处理高磷鲕状赤铁矿,在深度还原热力学分析的基础上,主要考察了还原温度、还原时间和配碳系数对还原效果和分选指标的影响。结果表明:铁矿物的还原历程为Fe₂O₃→Fe₃O₄→FeO（Fe₂SiO₄,FeAl₂O₄）→Fe,并在还原过程中出现了2FeO×SiO₂、FeSiO₃、Fe₂Al₂O₄和CaFe₂O₄等含铁复杂化合物。经过对还原温度、还原时间和配碳系数的考察,最终确定适宜的还原条件为:还原温度1250℃,还原时间50min,配碳系数2.0。经两段磨矿两段磁选可得到金属化率91.41%、铁品位90.41%、回收率91.27%的磁选铁粉。更多还原

【Abstract】 The coal-based reduction followed by magnetic separation process adopting for high-phosphorus oolitic hematite ore was investigated. On the basis of coal-based reduction thermodynamic analysis, the effects of reduction temperature, reduction time and distribution coefficient of carbon on the reduction and separation indexes. The results showed that the iron oxides in the oolitic ore were reduced to metallic iron following the route of Fe₂O₃→Fe₃O₄→FeO（Fe₂SiO₄,FeAl₂O₄）→Fe, as well as some iron complex compounds like 2FeO×SiO₂、FeSiO₃、Fe₂ Al₂O₄和 CaFe₂O₄, etc, were generated in reduction process. The reduction temperature, reduction time and distribution coefficient of carbon were investigated to explore the appropriate reduction conditions, finally, reduction temperature 1250℃, reduction time 50 min and distribution coefficient of carbon 2.0 were intended to be the most suitable conditions. The reduced sample was treated via two stages grinding and magnetic separation, the magnetic iron powder which metallization ratio was 91.41%, iron grade was 90.41% and iron recovery was 91.27%, respectively, was obtained.更多还原