鲕状赤铁矿悬浮焙烧的磁性研究  

Research on Magnetic Properties of Oolitic Hematite Roasted by Suspension Roasting Furnace

作　　者：王儒[1] 韩跃新[1] 李艳军[1] 张裕书[2] 

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819 [2]中国地质科学院矿产综合利用研究所,四川成都610041

出　　处：《东北大学学报（自然科学版）》2015年第7期1024-1028,共5页Journal of Northeastern University(Natural Science)

基　　金："十二五"国家科技支撑计划项目(2012BAB14B02);国土资源部地质调查项目(12120113087600)

摘　　要：针对鄂西某鲕状赤铁矿进行悬浮焙烧研究,并采用振动样品磁强计、X射线衍射分析仪、穆斯堡尔谱仪分析还原温度、还原时间、氧化温度、颗粒粒度对焙烧物料磁性和物相组成的影响规律.结果表明：铁矿石经悬浮焙烧后磁性明显增强,且焙烧物料磁性与强磁性铁矿物的含量呈正比.当还原温度为550~650℃时,还原物料的磁化强度和比磁化率随还原温度的升高而升高,超过700℃后则随之降低.延长还原时间可提高还原物料的磁化强度和比磁化率.焙烧物料中γ-Fe2O3含量随氧化温度升高而增加,在氧化温度为350℃时物料中γ-Fe2O3的含量达到最大值.当焙烧物料颗粒粒度小于15μm时,颗粒的磁化强度和比磁化率随之降低,而剩磁和矫顽力则随之增加.Suspension roasting test result of oolitic hematite from west part of Hubei province was investigated. The effects of reduction temperature,reduction time,oxidation temperature,particle size on the magnetic properties and phase composition of reduced iron ore were investigated by using vibrating sample magnetometer,X-ray diffraction,Mssbauer spectrometer. The results showthat magnetic properties of iron ore enhanced obviously after suspension roasting and directly proportional to the content of strong magnetic iron minerals. Both the magnetization intensity and magnetic susceptibility of reduced ore increased with increase of reduction temperature when reduction temperature range from 550 ℃ to 650 ℃. However,when reduction temperature rose to over 700 ℃,both the magnetization intensity and magnetic susceptibility decreased accordingly.The magnetization intensity and magnetic susceptibility of reduced ore increased with reduction time extending. The content of γ-Fe2O3 in roasted ore increased with the increase of oxidation temperature and reached the maximum value when oxidation temperature was at 350 ℃. When particle size is smaller than 15 μm,the magnetization intensity and magnetic susceptibility of particle decreased with the decrease of particle size,while remenance and corecivity of particle increased correspondingly.

关 键 词：鲕状赤铁矿 悬浮焙烧 穆斯堡尔谱 磁化强度 比磁化率 

分 类 号：TD95[矿业工程—选矿]