2016年6月第35卷第2期内蒙古科技大学学报Journal of Inner Mongolia University of Science and TechnologyJune,2016V01.35.No.2文章编号:2095—2295(2016)02—01 13—04DOI:10.16559/j.cnki.2095—2295.2016.02.004钾钠氟对赤铁矿球团还原膨胀性能的影响刘安康,罗果萍,王永斌,朱建国(内蒙古科技大学材料与冶金学院,内蒙古包头014010)关键词:K;Na;F;还原膨胀率中图分类号:TF046.6 文献标识码:A摘要:包头铁精矿球团中含有K,Na,F等有害元素,K,Na会造成球团的异常膨胀,而F的存在会使膨胀现象加剧,探究原因,采用分段还原法Fe:0,一Fe,0。,Fe,0。----Fe。0,Fe。0一Fe,测量各还原阶段的还原膨胀率,采用光学显微镜及SEM观察焙烧试样和还原产物的形貌.由结果可知,CaF:抑制了Fe:0,---,Fe,0。阶段的还原膨胀,但K,Na及CaF:含量较高时,CaF:反而促进了此阶段的还原膨胀;CaF2促进了Fe,0。---,Fe。O;同时CaF:促进了铁晶须的生长,加剧了Fe,0一Fe阶段还原膨胀.The influence of K,Na and F on reduction swelling of hematite pelletsUUAn—kang,LUO Guo—ping,WANG Yong—bin,ZHU Jian—guo(Materials and Metallurgy School,Inner Mongolia University of Science and Technology,Baotou 014010,China)Key words:K;Na;F;reduction swellingAbstract:The harmful elements K,Na in Baotou iron ore pellets result in unusual reduction swelling,which is aggravated by elementF.The specimens were reduced in three steps as follows:Fe203_F8304,Fe304_Fe。0,Fe。O_+Fe and their reduction swelling in eachstep was measured,respectively.The optical microscope and SEM were used to test the sintered and reduced tablets.As a result,CaF2restrains the reduction swelling of Fe203_F。304,which Was promoted byhigher content of K,Na and F.CaF2 also advanced the reduc—tion swelling of Fe304_Fe,0 and Fe。0_+Fe by producing low melting point slag and promoting the growth of iron whiskers.