钒钛磁铁矿煤基还原熔分及钒回收率优化试验  

Optimization Experiment of Coal-Based Reduction Smelting and Vanadium Recovery of Vanadium-Titanium Magnetite

作　　者：杨双平[1] 何少红 王苗[1] 赵永喆 杨尚琦 李江菡 Yang Shuangping;He Shaohong;Wang Miao;Zhao Yongzhe;Yang Shangqi;Li Jianghan(School of Metallurgical Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China)

机构地区：[1]西安建筑科技大学冶金工程学院,陕西西安710055

出　　处：《稀有金属》2024年第7期989-998,共10页Chinese Journal of Rare Metals

基　　金：陕西省科技厅-基础处-企业联合基金项目(2019JLP-15)资助。

摘　　要：以新疆葱岭钒钛磁铁矿为原料,焦炭为还原剂,开展了造球、金属化焙烧和还原熔分试验,在此基础上探究了影响钒回收率的因素(碱度、配碳量和熔分温度)。结果表明,生铁中的钒含量随着碱度和熔分温度的升高而增加,钒回收率随着配碳量、碱度和熔分温度的增高呈先增大后降低的趋势。提高碱度,渣中的复杂阴离子结构被破坏,钒回收动力学改善。当碱度过大时,渣中生成辉石族低熔点化合物,生铁质量下降,造成钒回收率降低。当熔分温度高于1500℃,配碳量高于15%时,渣中生成了尖晶石、钛酸钙等高熔点化合物,不利于渣铁分离。钒钛磁铁矿煤基还原熔分的最佳参数为:碱度为1.2,总配碳量为15%,熔分温度为1500℃,在此条件下渣铁分离效果较好,钒元素几乎都以金属钒的形式固溶在生铁中,钒回收率达98.07%。Vanadium-titanium magnetite is an important polymetallic iron ore in China,the main valued elements are Fe,V,and Ti.Currently,the main method for processing vanadium-titanium magnetite is the blast furnace-converter furnace method,but it has the disadvantages of low vanadium recovery and the need to add common iron ore in the smelting process.Therefore,metallurgists have conducted much research on non-blast furnace methods such as reduction-magnetic separation,roasting-leaching,bioleaching,reduction-magnetic separation,and melting separation.However,these methods still suffer from low vanadium recovery(≤90%)and extended recovery time.In order to recover vanadium from vanadium-titanium magnetite more efficiently,vanadium-titanium magnetite from Wuling,Xinjiang,as raw material and coke as the reducing agentwere used to investigate the effects of basicity,carbon content,and melting separation temperature on vanadium recovery and slag phasein this study.The phase composition of the raw material and slag was analyzed using X-ray diffraction(XRD).The microstructure of pig iron and slag was characterized using scanning electron microscopy(SEM)and energy dispersive spectroscopy(EDS).The metallization rate of the pellets was 73.56%when 5%coke was first added for pellet making,followed by roasting at 1250℃for 60 min.XRD pattern of the pellets showed that magnetite and ilmenite were still present in the metalized pellets,probably due to the insufficient amount of carbon content,which would continue to be increased in the melting separation experiments.The melting test showed that basicity,carbon content,and melting separation temperature could improve vanadium recovery,the main factor affecting vanadium recovery was the melting separation temperature,basicity,and carbon content were secondary factors.XRD pattern of the slag showed that CaSiTiO5 and W1-p(X,Y)1+pZ2O6 were produced at a basicity of 1.2,which reduced the melting point and viscosity of the slag and facilitates the melting separation of vanadium-titanium magn

关 键 词：钒钛磁铁矿 钒回收率 碱度 配碳量 熔分温度 

分 类 号：TF555[冶金工程—钢铁冶金]