MgO在含铬型钒钛烧结矿制备中的迁移及作用  

Transference and influences of MgO in sintering of Cr-bearing vanadium and titanium magnetite

作　　者：周密[1] 杨松陶[1] 姜涛[1] 薛向欣[1] 

机构地区：[1]东北大学材料与冶金学院,沈阳110819

出　　处：《中国有色金属学报》2014年第12期3108-3114,共7页The Chinese Journal of Nonferrous Metals

基　　金：国家高技术研究发展计划资助项目(2012AA062302;2012AA062304);国家自然科学基金重大项目(51090384);国家自然科学基金资助项目(51174051);科技部重大国际合作项目(2012DFR60210)

摘　　要：研究在含铬型钒钛矿烧结过程中MgO对烧结矿转鼓强度（TI）及低温还原粉化指数（RDI）的影响,采用熔点熔速仪和SEM-EDS研究MgO对含铬型钒钛矿熔化特性的影响,并探讨MgO在烧结过程的迁移行为。结果表明：当MgO含量为1.95%-2.63%（质量分数）时,MgO含量的提高对含铬型钒钛矿熔化特性未产生不利影响;当MgO含量由1.95%增加到2.63%时,烧结矿转鼓强度由50.33%提高到53.40%,RDI＋3.15由80.57%上升到82.71%;MgO的迁移主要以Mg2＋的形式通过类质同象形式取代Fe^2＋而形成含镁磁铁矿（Fe,Mg）O·Fe2O3,Mg^2＋的含量随着MgO含量的提高而增多,其迁移历程为：Fe O·Fe2O3→（Fe,Mg）O·Fe2O3→（Mg,Fe）O·Fe2O3→MgO·Fe2O3。The influences of MgO on the tumbler index （TI）, reduction degradation index （RDI） and melting characteristics of V-Ti-Cr magnetite sinter were studied. The transference and interaction mechanism of MgO in sintering of V-Ti-Cr magnetite were investigated by melting point-rate measuring and SEM-EDS. The results show that, when MgO content （mass fraction） increases from 1.95%to 2.63%,the melting characteristic of V-Ti-Cr magnetite does not become worse. Furthermore, TI increases from 50.33%to 53.40%and RDI＋3.15 increases from 80.57%to 82.71%with increasing MgO content from 1.95%to 2.63%. The transference of MgO is mainly in the form of Mg^2＋, which diffuses into crystal lattice of magnetite and forms （Fe, Mg）O·Fe2O3,and the content of Mg^2＋ in magnetite increases with increasing MgO content. The course of transference of MgO is FeO→Fe 2 O 3→（Fe, Mg）O→Fe 2 O 3→（Mg, Fe）O→Fe 2 O 3→MgO→Fe2O3.

关 键 词：含铬型钒钛磁铁矿 MGO 熔化特性 迁移 烧结 

分 类 号：TF521[冶金工程—钢铁冶金]