(东北大学 材料与冶金学院，沈阳 110819)
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Fe2+而形成含镁磁铁矿(Fe，Mg)O·Fe2O3，Mg2+的含量随着MgO含量的提高而增多，其迁移历程为：FeO·Fe2O3→(Fe, Mg)O·Fe2O3→(Mg, Fe)O·Fe2O3→MgO·Fe2O3。
关键字: 含铬型钒钛磁铁矿；MgO；熔化特性；迁移；烧结
（School of Materials and Metallurgy, Northeastern University, Shenyang 110819, China）
Abstract: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 Mg2+, which diffuses into crystal lattice of magnetite and forms (Fe, Mg)O·Fe2O3，and the content of Mg2+ in magnetite increases with increasing MgO content. The course of transference of MgO is FeO·Fe2O3→(Fe, Mg)O·Fe2O3→(Mg, Fe)O·Fe2O3→ MgO·Fe2O3.
Key words: Cr-bearing V-Ti magnetite; MgO; melting characteristics; transference; sintering
