钒钛磁铁矿制备镁质熔剂性球团性能研究  

Study on the properties of magnesia flux pellets prepared from vanadium-titanium magnetite

作　　者：袁壮 潘建[1] 朱德庆[1] 郭正启[1] 杨聪聪[1] 王硕 王定政 YUAN Zhuang;PAN Jian;ZHU Deqing;GUO Zhengqi;YANG Congcong;WANG Shuo;WANG Dingzheng(School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,Hunan,China)

机构地区：[1]中南大学资源加工与生物工程学院,湖南长沙410083

出　　处：《烧结球团》2021年第3期47-52,85,共7页Sintering and Pelletizing

基　　金：国家青年自然科学基金资助项目(51574281)。

摘　　要：镁质熔剂性球团因具备良好的冶金性能,越来越受到高炉的青睐。本文通过相关球团试验,研究了不同碱度与w(MgO)对钒钛磁铁矿制备的成品球团强度、冶金性能的影响;并对成品球团的微观结构及物相组成进行分析,阐述了球团的固结机理。研究结果表明:随着碱度的增加,成品球团内部孔隙率增大,导致其抗压强度降低;而w(MgO)的增加,成品球晶粒间的连接虽受到一定影响,但MgO粘附在晶粒表面抑制了钙钛矿的生成,最终使得球团抗压强度受影响较小。在碱度为0.48,w(MgO)为3.0%时,可制备出RI为75.29%,RDI+6.3 mm为97.31%,RSI为12.45%的优质镁质熔剂性球团,其可作为优质的高炉炉料。Magnesium fluxed pellets are more and more used in blast furnace smelting due to their good metallurgical performances.In this paper, the effect of basicity and w(MgO) on the properties of vanadium-titanium magnetite pellets was investigated by pelletizing tests, and the difference of consolidation mechanism of pellets was revealed by the mineralogical analysis of the pellets.The results indicate that with the increase of basicity, the porosity of the finished pellets increase, resulting in the reduction of its compressive strength.Besides, as w(MgO)increases, the increased w(MgO) is adverse to the grain connectivity of vanadium-titanium magnetite finished pellets, but the compressive strength is not obviously reduced attributing to the odhesion of MgO on the grain snrface, inhibiting the formation of perovskite.Furthermore, when the basicity and w(MgO) are 0.48 and 3.0% respectively, the high-quality magnesium fluxed pellets can be obtained with the RI,RDI+6.3 mm and RSI of 75.29%,97.31% and 12.45% respectively, and it can be used as high-quality blast furnace charge.

关 键 词：碱度 MGO 钒钛磁铁矿 固结机理 镁质熔剂性球团 

分 类 号：TF046.6[冶金工程—冶金物理化学]