利用电化学方法测定熔渣中Ni^(2+)扩散系数  

Measurement of diffusion coefficient of Ni^(2+) in molten slag by electrochemical methods

作　　者：洪川[1] 高运明[1] 杨创煌[1] 张灿磊[1] 

机构地区：[1]武汉科技大学钢铁冶金及资源利用省部共建教育部重点实验室,湖北武汉430081

出　　处：《武汉科技大学学报》2015年第4期245-249,共5页Journal of Wuhan University of Science and Technology

基　　金：国家自然科学基金资助项目(51174148);武汉科技大学大学生科技创新基金研究项目(14ZRA004)

摘　　要：利用ZrO2(MgO)固体电解质管集成构建Pt,O2(air)|ZrO2作参比电极的可控氧流电解池,采用循环伏安法和计时电流法在1773K下对含3%NiO熔渣中Ni2+的扩散系数进行测定。结果表明,在一定条件下熔渣中Ni2+在Ir电极上的还原是一步还原并受扩散控制的可逆过程;两种方法测得Ni 2+扩散系数值相近且与文献值基本吻合,分别为(8.1±0.2)×10-6和(6.8±1.5)×10-6 cm2/s。因此,可认为采用此电解池装置测定熔渣中Ni 2+的扩散系数是可行的。An electrolytic cell with controlled oxygen flow and Pt,O2（air）｜ZrO2as the reference electrode was constructed integrally through a one-end-closed magnesia partially stabilized zirconia solid electrolyte tube.Cyclic voltammetry（CV）and chronoamperometry（CA）methods were employed to determine the diffusion coefficient of Ni 2＋in molten slag containing 3% NiO.The results show that the reduction of Ni 2＋ion on Ir electrode is a one-step reduction and diffusion-controlled reversible process under given conditions.The diffusion coefficients of Ni 2＋derived from CV and CA methods are close to each other and consistent with records in the relevant literatures,which are（8.1±0.2）×10-6and（6.8±1.5）×10-6 cm2/s,respectively.Hence,it＇s feasible to measure the diffusion coefficient of Ni 2＋in molten slag with the aid of this electrolytic cell.

关 键 词：NI2+ 熔渣 扩散系数 电解池 循环伏安法 计时电流法 

分 类 号：TQ151.5[化学工程—电化学工业]