MgO对赤铁矿压团还原膨胀性能的影响  

Effect of MgO Addition on Reduction Expansion Properties of Hematite Briquetting

作　　者：孙晨晨 罗果萍[1] 王永斌[1] 朱建国[1] SUN Chen-chen;LUO Guo-ping;WANG Yong-bin;ZHU Jian-guo(School of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, Inner Mongolia, China)

机构地区：[1]内蒙古科技大学材料与冶金学院,内蒙古包头014010

出　　处：《有色金属（冶炼部分）》2019年第5期12-16,共5页Nonferrous Metals（Extractive Metallurgy)

基　　金：国家自然科学基金资助项目(51364030)

摘　　要：为探究MgO对球团还原膨胀性能的影响机理,分阶段还原了添加不同MgO纯试剂的赤铁矿压团(Fe_2O_3→Fe_3O_4、Fe_3O_4→FeO和FeO→Fe三个阶段),同时利用扫描电镜对还原产物进行表征。结果表明,当压团添加MgO含量分别为0%、2%和4%时,在还原第一阶段压团还原膨胀率分别为11.06%、5.63%、3.85%,随着MgO含量的增加压团还原膨胀率逐渐降低。还原第二阶段加入MgO的压团还原膨胀率依然随MgO含量的增加而降低。在还原第三阶段,MgO的添加抑制了铁晶须的生长,添加MgO含量分别为0%、2%和4%时,压团还原膨胀率分别为28.33%、15.21%和10.91%。In order to explore influence mechanism of MgO on reduction expansion properties of pellets, step-by-step reduction of hematite briquetting with addition of different amounts of MgO pure reagents (i.e., Fe2O3 →Fe3O4, Fe3O4→FeO and FeO→Fe) was conducted. Reduction products were characterized by SEM. The results show that when MgO addition is 0%, 2% and 4% respectively, reduction expansion rate of briquettes in the first stage of reduction is 11.06%, 5.63% and 3.85%, respectively. Expansion rate gradually drops with increasing addition of MgO. At the second reduction stage, expansion rate still gradually drops with increase of addition of MgO. In the third stage of reduction, growth of iron whiskers is restrained by addition of MgO, and expansion rate is 28.33%, 15.21% and 10.91% when MgO addition is 0%, 2% and 4% respectively.

关 键 词：MGO 逐级还原 晶型转变 还原膨胀率 铁晶须 

分 类 号：TF046[冶金工程—冶金物理化学]