低镁钒钛磁铁矿的还原机理  

Reduction mechanism of low-magnesium vanadium ilmenite

作　　者：闫占辉[1] 张建良[1] 邢相栋[1,2] 王振阳[1] 刘兴乐[1] 任山[1] 

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083 [2]西安建筑科技大学冶金工程学院,西安710055

出　　处：《材料与冶金学报》2015年第1期18-23,共6页Journal of Materials and Metallurgy

基　　金：国家重点基础研究发展计划资助(2012CB720400)

摘　　要：为开发利用辽宁朝阳地区低镁钒钛磁铁矿资源,本文以石墨粉为还原剂,研究还原温度、碳氧比等因素对内配碳球团还原过程的影响,并采用X射线衍射(XRD)和扫描电镜(SEM)等分析方法对还原机理进行分析.研究结果表明,低镁钒钛磁铁矿与攀西地区钒钛磁铁矿相比,易于还原.当还原温度超过1 150℃时,球团均能快速进行反应;配碳比增加有利于反应分数的提高.随着反应时间的延长,球团内部先后出现浮氏体、新生钛铁矿和FeTi2O5等过渡相,还原产生的金属铁从矿物颗粒外表面到内部依次析出,金属铁相不断增加并聚集长大,球团内部新生相界面逐渐清晰.In order to exploit the low- magnesium vanadium- ilmenite resources in Chaoyang area of Liaoning province,the influences of reduction temperature,n（C） /n（O）（ carbon oxygen mole ratio） and etc. on the reduction process for carbon- containing pellets were studied taken graphite as a reducing agent,and the reduction mechanism was analyzed by mean of X- ray diffraction（ XRD）,scanning electron microscope（SEM）. The results showed that the low- magnesium vanadium ilmenite is easier to be reduced compared with one in panxi area. The pellets could be quickly reduced at temperatures above 1 150 ℃. It is beneficial for the reduction process when the n（C） /n（O） increases. With increment of the reduction time,some transitional phases such as wustite,the renewed ilmenite and FeTi2O5 appear successively in the internal of pellets. Metallic iron formed form the reduction growing up and gathering continually precipitates from outer surface and interior of the mineral particles. The newly formed phase interface inside the pellets become clear gradually.

关 键 词：低镁钒钛磁铁矿 还原温度 还原机理 碳氧比 

分 类 号：TF111.13[冶金工程—冶金物理化学]