外加电势条件下MgO–C耐火材料表面的电沉积行为  

Electro-deposition Behaviour on Surface of MgO–C Refractory in Applied Electric Field

作　　者：徐英君 王德永[1] 王慧华[1] 徐周[1] 屈天鹏[1] 

机构地区：[1]苏州大学沙钢钢铁学院,江苏苏州215021

出　　处：《硅酸盐学报》2017年第3期453-458,共6页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(51604179;51674172);江苏省自然科学基金(BK20140346)资助

摘　　要：以高温熔渣为电解质、MgO–C砖为阴极和阳极,1823K条件下研究了外加电势对阴极耐火材料表面电沉积效果的影响。结果表明:合理电压范围内,熔渣会发生电解,阴极表面单质Si和Fe析出是诱发熔渣组分偏移的驱动力,也是导致电沉积的内在因素,高熔点沉积层的形成可为耐火材料抗熔渣侵蚀提供良好的物理和化学保护;在CaO–SiO_2–Al_2O_3渣系中,单质硅的析出电位约为–6.1V,CaO–SiO_2–Fe_2O_3渣系中,单质铁的析出电位约为–1.25V,硅的析出电位为–5.85V,可以为优选合理电势提供基础;阴极耐火材料形成沉积物的类型与熔渣组成密切相关。The effect of applied voltage on the electro-deposition on the surface of cathode refractory was investigated at 1 823 K when molten slag was used as an electrolyte and MgO-C refractory was prepared as cathode and anode. The results show that the electrolytic reaction occurs in molten slag in a reasonable voltage range. The separation of elemental Si and Fe can induce the shifting of slag composition around the cathode and the electro-deposition. The formation of high-melting product layer is an effective physical and chemical protection for the refractory. According to the measurement of linear sweep voltanunetry （LSV） curves, the deposition potential of Si is -6.1 V in the slag of CaO-SiO2-A1203 system. In the CaO-SiO2-Fe2O3 system, the deposition potential of Fe is -1.25 V and the deposition potential of Si is -6.1 V. The formation of cathode electrodeposit is closely related to the slag type and composition.

关 键 词：外加电势 镁碳砖 电沉积 渗透 

分 类 号：TQ175[化学工程—硅酸盐工业]