添加Fe2O3对碳热还原含钛高炉渣的影响  

Effect of Fe2O3 addition on the carbothermic reduction of titanium-bearing blast furnace slag

作　　者：王凯飞 张国华 王璐 周国治 Kaifei WANG;Guohua ZHANG;Lu WANG;Guozhi ZHOU(University of Science and Technology Beijing,State Key Laboratory of Advanced Metallurgy,Beijing 100083,China)

机构地区：[1]北京科技大学钢铁冶金新技术国家重点实验室

出　　处：《过程工程学报》2018年第6期1276-1282,共7页The Chinese Journal of Process Engineering

基　　金：北京科技大学钢铁冶金新技术国家重点实验室自主研发项目(编号:41600006)

摘　　要：以攀枝花含钛高炉渣为原料,针对碳热还原含钛高炉渣的还原产物TiC晶粒粒径较小而难以分离的问题,在原料中添加不同比例的Fe2O3促进TiC与渣相分离.结果表明,原料中加入Fe2O3后,还原产物中Fe在渣中呈弥散分布,渣中TiC晶粒依附Fe相生长.Fe2O3添加量为5wt%时,依附于Fe相形核长大的TiC明显沉降,富集于还原产物底部,含钛高炉渣还原产物中TiC初步富集.Titanium is a very kind of important and useful metal, which is widely used in the aerospace and chemical industries. By the beneficiation process of Panzhihua Iron and Steel Co., titanomagnetite concentrates and ilmenite concentrates are produced.The titanomagnetite concentrates are widely used as the raw materials for the blast furnace process now,by which most of the iron and vanadium can be reduced into the hot metal. However,almost all of the titanium remain in the slag to form the high titanium bearing slag,which contains about 21wt%-25wt% of TiO2.In the present study,the carbothermic reduction experiments of titanium-bearing blast furnace slag were carded out in argon atmosphere at high temperature.The main subject was to separate the reduction product TiC from the remaining slag considering the small grain size of the produced TiC during the carbothermic reduction process.The influences of adding Fe2O3 on the reaction process were studied by XRD and SEM-EDS.The results showed that during the carbothermic reduction process,it can be known that the changes of standard Gibbs free energy was negative at 1773K.Adding a small amount of Fe2O3 into the raw material was beneficial for the dispersion of Fe phase in the liquid slag as well as the growth of TiC particle size.When the content of Fe2O3 was increased to 5wt%,TiC which grows attached to the Fe phase will settle down and concentrate at the bottom of the reduction product to achieve the preliminary enrichment of TiC.This finding may contribute to the seperation and extraction of titanium from titanium bearing blast furnace slag in the form of TiC phase.

关 键 词：碳热还原 含钛高炉渣 三氧化二铁 形核长大 富集 

分 类 号：TF111[冶金工程—冶金物理化学]