温度对鲕状赤铁矿石深度还原特性的影响  

Effect of temperature on coal-based reduction of an oolitic iron ore

作　　者：孙永升[1] 韩跃新[1] 高鹏[1] 王琴 

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819 [2]中信重工机械股份有限公司,河南洛阳471003

出　　处：《中国矿业大学学报》2015年第1期132-137,共6页Journal of China University of Mining & Technology

基　　金：国家自然科学基金重点项目(51134002);中央高校基本科研业务费专项资金项目(N120601004)

摘　　要：深度还原-磁选技术可以高效回收鲕状赤铁矿石中的有价组分铁.为查明还原温度对鲕状赤铁矿石还原特性的影响规律,采用热重差热分析、X射线衍射和扫描电子显微镜等对不同还原温度下鲕状赤铁矿石还原产物的物相组成及微观结构进行研究.结果表明:鲕状赤铁矿石具有良好的热稳定性,其熔化温度为1 312℃;还原过程中还原产生的FeO会与脉石矿物反应,生成铁橄榄石和尖晶石;还原温度是影响该矿石还原过程中物相转变和微观结构破坏的关键;还原温度越高,还原产物的物相组成越简单,矿石鲕粒结构破坏程度越严重.Coal-based reduction followed by magnetic separation is an effective technology to recovery iron from oolitic iron ore.In order to investigate the effect of reduction temperature on reduction features of oolitic iron ore,the phase composition and microstructure of reduced materials at different reduction temperatures were researched using a thermogravimetry-differential thermal analysis（TG-DTA）,X-ray diffraction（XRD）and scanning electron microscopy（SEM）.The results indicate that the oolitic iron ore with melting temperature of 1 312℃ have agood thermal stability.During reduction,the FeO produced by reduction reacts with gangue minerals and generates fayalite and spinel.Reduction temperature plays an important role in the phase transformation and microstructure destroying of oolitic iron ore.The higher the reduction temperature is,the simpler the phase composition of reduced materials,and more serious the destruction of the oolitic structure is.

关 键 词：鲕状赤铁矿石 深度还原 物相组成 微观结构 相变 

分 类 号：TD925.7[矿业工程—选矿]