赤铁矿微波还原焙烧-弱磁选工艺研究  

Study on Technology of Microwave Reduction Roasting-Low Intensity Magnetic Separation of Hematite

作　　者：李解[1] 韩腾飞[1] 李保卫[1] 韩继铖[1] 王少炳 

机构地区：[1]内蒙古科技大学白云鄂博矿多金属资源综合利用国家重点实验室,内蒙古包头014010

出　　处：《矿冶工程》2014年第1期82-86,共5页Mining and Metallurgical Engineering

基　　金：内蒙古自然科学基金项目(2012MS0714);内蒙古自治区高等学校科学研究项目(NJZY13149);内蒙古科技大学创新基金(2011NCL064);白云鄂博矿多金属资源综合利用国家重点实验室资助项目(BO-13-001)

摘　　要：以活性炭为还原剂，氩气为保护气，采用微波还原焙烧的方法，将3种低品位赤铁矿还原为磁铁矿，并研究了微波还原焙烧温度、碳含量、保温时间及微波输出功率对其磁选指标的影响规律。结果发现：相同质量3种赤铁矿进行微波还原焙烧，随配碳量的增加，其升温速率加快，且3种赤铁矿具有相似的微波还原焙烧规律，即：在570—650℃、理论配碳量、微波输出电压220V及保温10min的条件下，其还原产物弱磁选后的品位和回收率均达到最佳，且磁铁精矿经细磨．二次磁选后，铁品位均能提高到60％以上。该研究对开发低品位赤铁矿的选冶技术新流程有重要的指导意义。Three kinds of low grade hematite were changed into magnetite by microwave reduction roasting process with argon as protective gas and active carbon as reductant. The influences of roasting temperature, carbon content, holding time and microwave output power on magnetic separation results were investigated. It was showed that heating rates of three kinds of hematite ores of same mass increased with the increase of C content during microwave heating. There was a similar microwave reduction roasting law for three kinds of hematite, that is, the grade and recovery of the sinters after low intensity magnetic separation were optimum at a roasting temperature of 570 - 650 ℃, with theoretical carbon content, holding time of 10 mins and microwave output voltage of 220 V. Furthermore, the iron grades of three kinds of magnetic concentrates all reached up to 60% after the process of fine grinding-secondary magnetic separation. This work has great instructive significance for the development of new dressing and metallurgical processes for low grade hematite.

关 键 词：赤铁矿 微波加热 还原焙烧 磁选 

分 类 号：TF111[冶金工程—冶金物理化学]