(東北大學(xué) 材料與冶金學(xué)院，沈陽(yáng) 110819)
摘 要: 研究在含鉻型釩鈦礦燒結(jié)過(guò)程中MgO對(duì)燒結(jié)礦轉(zhuǎn)鼓強(qiáng)度(TI)及低溫還原粉化指數(shù)(RDI)的影響，采用熔點(diǎn)熔速儀和SEM-EDS研究MgO對(duì)含鉻型釩鈦礦熔化特性的影響，并探討MgO在燒結(jié)過(guò)程的遷移行為。結(jié)果表明：當(dāng)MgO含量為1.95%~2.63%(質(zhì)量分?jǐn)?shù))時(shí)，MgO含量的提高對(duì)含鉻型釩鈦礦熔化特性未產(chǎn)生不利影響；當(dāng)MgO含量由1.95%增加到2.63%時(shí)，燒結(jié)礦轉(zhuǎn)鼓強(qiáng)度由50.33%提高到53.40%，RDI+3.15由80.57%上升到82.71%；MgO的遷移主要以Mg2+的形式通過(guò)類質(zhì)同象形式取代Fe2+而形成含鎂磁鐵礦(Fe，Mg)O·Fe2O3，Mg2+的含量隨著MgO含量的提高而增多，其遷移歷程為：FeO·Fe2O3→(Fe, Mg)O·Fe2O3→(Mg, Fe)O·Fe2O3→MgO·Fe2O3。
關(guān)鍵字: 含鉻型釩鈦磁鐵礦；MgO；熔化特性；遷移；燒結(jié)
（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
