含碳酸盐赤铁矿石浮选中矿深度还原试验研究  

Iron recovery from flotation middling produced in carbonates-bearing hematite ore using coal-based reduction

作　　者：高鹏[1] 纪新[2] 任多振[1] 韩跃新[1] 

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819 [2]鞍钢集团矿业设计研究院,辽宁鞍山114002

出　　处：《中国矿业大学学报》2013年第5期812-816,共5页Journal of China University of Mining & Technology

基　　金："十二五"国家科技支撑计划项目(2012BAB14B05);国家高技术研究发展计划(863)项目(2012AA062401)

摘　　要：采用深度还原技术将东鞍山含碳酸盐赤铁矿石浮选中矿中的铁矿物还原为金属铁颗粒,再经磁选实现了铁的高效回收利用.热力学分析表明:在煤基深度还原过程中,当温度高于737℃时,FeCO3将按FeCO3→Fe3O4→FeO→Fe和FeCO3→FeO→Fe的顺序还原成金属铁;研究了还原温度、还原时间、料层厚度对还原物料金属化率的影响规律,确定了适宜的深度还原条件为:还原温度1 250℃、还原时间70min、料层厚度25mm,制备了金属化率88.71%的深度还原物料.采用预先脱碳-细磨-两段磁选的分选流程,获得了铁品位90.27%、金属化率91.18%、铁回收率91.95%的铁粉.Coal-based reduction followed by magnetic separation was used to recover iron from middlings produced in flotation process of carbonates-bearing hematite ore in Donganshan. The thermodynamic analysis indicate that the siderite was reduced to metallic iron in the sequence of FeCO3→Fe304→FeO→Fe and FeCO3→FeO→Fe when reduction temperature was above 737 ℃ during the reduction. The effects of reduction temperature, reduction time and feed layer thickness on the metallization rate were investigated in detail. The reduced material with met- allization rate of 88.71% could be obtained under the reduction temperature of 1 250 ℃, reduc- tion time of 70 min and feed layer thickness of 25 mm. By the process of pre decarburization, grinding and two-stage magnetic separation, the iron powder containing 90.27% Fe with met- allization rate of 91.18% and iron recovery of 91.95% was obtained.

关 键 词：含碳酸盐赤铁矿石 深度还原 金属化率 金属铁颗粒 

分 类 号：TD925.7[矿业工程—选矿]