钒钛铁精矿润湿程度对高压辊磨机械活化的影响  

Effect of wetting degree of vanadium-titanium-iron concentrate on mechanical activation in high pressure roller grinding

作　　者：范晓慧[1] 李诗娴 甘敏[1] 吕浩 文小平[2] 谢路奔 FAN Xiaohui;LI Shixian;GAN Min;LÜHao;WEN Xiaoping;XIE Luben(School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,Hunan,China;Hunan Valin Xiangtan Iron and Steel Co.,Ltd.,Xiangtan 411101,Hunan,China;Xiangtan Ruitong Pellet Co.,Ltd.,Xiangtan 411101,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 [2]湖南华菱湘潭钢铁有限公司,湖南湘潭411101 [3]湘潭瑞通球团有限公司,湖南湘潭411101

出　　处：《钢铁研究学报》2024年第9期1142-1151,共10页Journal of Iron and Steel Research

基　　金：国家自然科学基金资助项目(52174330);国家重点研发计划资助项目(2023YFC3707002);湖南省研究生科研创新资助项目(QL20220069)。

摘　　要：高压辊磨预处理可改善球团矿质量,然而其机械活化效果受许多参数影响。研究了不同给料水分下高压辊磨对钒钛铁精矿性质、成球与焙烧性能的影响,确定了钒钛铁精矿高压辊磨机械活化的适宜润湿程度。结果表明:当给料水分质量分数由5.5%提高至8.5%,高压辊磨后钒钛铁精矿粒径先减小后趋于稳定,比表面积增大,亲水性和成球性增强。但给料水分含量的增加不利于含铁矿物与脉石之间的解离,钛磁铁矿解离度降低。当给料水分质量分数为6.5%~7.5%时,高压辊磨机械活化作用最强,此时钛磁铁矿晶粒尺寸最小,晶格畸变率最大,并且制备的钒钛铁精矿球团质量指标最优。适宜的钒钛铁精矿高压辊磨给料水分质量分数为6.5%~7.5%。相对应地,在高压辊磨前需将钒钛铁精矿润湿至毛细水质量分数为4.4%~5.4%。High pressure roller grinding(HPRG)pretreatment can improve the quality of pellets,but its mechanical activation effect is affected by many parameters.The effects of HPRG pretreatment on the properties,pelletizing and roasting properties of vanadium-titanium-iron concentrate under different water contents were studied,and the suitable wetting degree for mechanical activation of vanadium-titanium-iron concentrate by HPRG pretreatment was determined.The results show that when the water content increases from 5.5 wt.%to 8.5 wt.%,the particle size of vanadium-titanium-iron concentrate decreases firstly and then tends to be stable after HPRG pretreatment,the specific surface area increases,and the hydrophilicity and billability are enhanced.However,the increase of water content is not conducive to the dissociation between iron ore and gangue,and the mineral liberation degree of titanomagnetite decreases.When the water content is 6.5 wt.%-7.5 wt.%,the mechanical activation of HPRG is the strongest.At this time,the grain size of titanomagnetite is the smallest,the lattice distortion rate is the largest,and the quality index of the prepared vanadium-titanium-iron concentrate pellets is the best.The suitable water content of vanadium-titanium-iron concentrate in HPRG pretreatment is 6.5 wt.%-7.5 wt.%.Correspondingly,the vanadium-titanium-iron concentrate needs to be wetted to a capillary water content of 4.4 wt.%-5.4 wt.%before HPRG pretreatment.

关 键 词：钒钛铁精矿 润湿程度 高压辊磨 表面性质 机械活化 氧化球团 

分 类 号：TF52[冶金工程—钢铁冶金]