铁酸锌钙化碳热还原的热力学行为  

Thermodynamic behavior of calcified carbothermal reduction of zinc ferrite

作　　者：祁德兴 余水 郭秋月 文应江 邱家用[1,3] 毛瑞 QI Dexing;YU Shui;GUO Qiuyue;WEN Yingjiang;QIU Jiayong;MAO Rui(School of Metallurgical and Materials Engineering,Jiangsu University of Science and Technology,Zhangjiagang 215600,Jiangsu,China;Ironmaking Environment Research Office of Jiangsu Shagang Iron and Steel Research Institute,Zhangjiagang 215625,Jiangsu,China;Institute of Fine Metallurgy,Industrial Technology Research Institute,Jiangsu University of Science and Technology,Zhangjiagang 215600,Jiangsu,China)

机构地区：[1]江苏科技大学冶金与材料工程学院,江苏张家港215600 [2]江苏省沙钢钢铁研究院炼铁环境研究室,江苏张家港215625 [3]张家港江苏科技大学产业技术研究院精细冶金研究所,江苏张家港215600

出　　处：《有色金属科学与工程》2024年第4期505-512,共8页Nonferrous Metals Science and Engineering

基　　金：2022年江苏省研究生科研创新计划资助项目(KYCX22_3803)。

摘　　要：通过热力学计算和实验相结合,分析了含锌电炉粉尘中铁酸锌钙化碳热还原过程热力学行为,讨论还原温度和碳氧摩尔比对铁酸锌钙化碳热还原行为的影响。结果表明,与传统碳热还原相比,ZnFe_(2)O_(4)钙化碳热还原可在较低温度生成ZnO,并可在1100 K直接由ZnFe_(2)O_(4)得到部分单质Zn。当温度高于1221 K时,ZnFe_(2)O_(4)钙化还原出的单质Zn以及由ZnO还原的Zn均以锌蒸气形式挥发,并随着配碳量及温度的升高还原挥发增强。钙化碳热还原不仅降低ZnFe_(2)O_(4)消失的温度,而且降低其还原产出金属铁和锌的温度和碳耗。CaO可重构物相从而明显降低铁酸锌反应产出ZnO、Zn和Fe的温度点,使得ZnFe_(2)O_(4)提前反应完全。当温度为1270 K,碳氧摩尔比n(C)/n(O)=0.7时,ZnFe_(2)O_(4)中锌铁还原与分离效果较好,此时Zn以蒸气形式挥发,Fe以金属单质形式被还原出来。By combining thermodynamic calculations and experimental study,the thermodynamic behavior of calcified carbothermal reduction of zinc ferrite in zinc-containing electric arc furnace dust was analyzed,and the effect of reduction temperature and the molar ratio of carbon to oxygen on the calcified carbothermal reduction behavior of zinc ferrite were discussed.The results showed that compared with traditional carbothermal reduction,calcified carbothermal reduction of ZnFe_(2)O_(4)can produce ZnO at a lower temperature,and some elemental Zn can be directly obtained from ZnFe_(2)O_(4)at 1100 K.When the temperature was higher than 1221 K,both elemental Zn reduced from ZnFe_(2)O_(4)and Zn reduced from ZnO were volatilized in the form of zinc vapor,and the volatilization was enhanced with the increase of carbon ratio and temperature.Furthermore,calcified carbothermic reduction not only lowered the temperature at which ZnFe_(2)O_(4)disappeared but also reduced the temperature and carbon consumption required for the reduction to produce metallic iron and zinc.CaO can reconstruct the phase of the material,significantly reducing the temperature points at which the reaction of zinc ferrite with iron oxide produced ZnO,Zn,and Fe,thus allowing ZnFe_(2)O_(4)to react completely earlier.At a temperature of 1270 K and a molar ratio of carbon to oxygen(n(C)/n(O))of 0.7,optimal reduction and separation of zinc and iron in ZnFe_(2)O_(4)were achieved,with Zn volatilizing in vapor form and Fe being reduced to metallic form.

关 键 词：铁酸锌 钙化碳热还原 热力学 锌还原 铁还原 

分 类 号：TF09[冶金工程—冶金物理化学]