1673 K下SiO2-CaO-MgO-Al2O3熔渣中 Ni2+的电化学行为*
录用日期: 2015-04-27
网络出版日期: 2015-05-25
基金资助
*国家自然科学基金项目51174148和武汉科技大学大学生科技创新基金研究项目14ZRA004资助
ELECTROCHEMICAL BEHAVIOR OF Ni2+ IN SiO2-CaO-MgO-Al2O3 MOLTEN SLAG AT 1673 K
Accepted date: 2015-04-27
Online published: 2015-05-25
Supported by
Supported by National Natural Science Foundation of China (No.51174148)
利用MgO部分稳定的ZrO2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、方波伏安、计时电位、恒电位电解等电化学测试技术研究了1673 K高温下SiO2-CaO-MgO-Al2O3熔渣中Ni2+的电化学行为. 结果表明, O2-在熔渣中的扩散和在ZrO2固体电解质内的电迁移不是熔渣中电活性物质还原的限制性环节, 在本实验条件下利用构建的可控氧流电解池研究熔渣中Ni2+的电化学行为是可行的. 熔渣中Ni2+在Ir电极上还原到Ni是受扩散控制的一步还原的可逆过程, 利用循环伏安和计时电位测试技术所得数据计算得出了含有3%NiO的熔渣中Ni2+的扩散系数分别为(3.50±0.18)×10-6和(2.80±0.22)×10-6 cm2/s, 与相关文献结果基本吻合.
洪川,高运明,杨创煌,童志博 . 1673 K下SiO2-CaO-MgO-Al2O3熔渣中 Ni2+的电化学行为*[J]. 金属学报, 2015 , 51(8) : 1001 -1009 . DOI: 10.11900/0412.1961.2015.00065
The modern iron and steel industry produces large emissions of CO2 annually. Electrolytic reduction of molten slag containing iron oxide at high temperature using an inert oxygen evolving anode is an alternative process to reduce or eliminate the formation of CO2. In order to establish reasonable process parameters of electrolytic method for steel containing Ni, it is necessary to master the electrochemical behavior of Ni2+ in molten slag. However, investigations on the electrochemical behavior of Ni2+ in molten slag at higher temperatures were very limited, which can probably be attributed to the experimental difficulties associated with the operation of high-temperature electrochemical cells. An electrolytic cell with a controlled oxygen flow and Pt, O2(air)|ZrO2 used as reference electrode was constructed integrally through a one-end-closed magnesia partially stabilized ZrO2 solid electrolyte tube. Electrochemical behavior of Ni2+ on Ir electrode was investigated in SiO2-CaO-MgO-Al2O3 molten slag at 1673 K by means of electrochemical techniques such as cyclic voltammetry (CV), square wave voltammetry (SWV), chronopotentiometry (CP) and potentiostatic electrolysis. The results show that both diffusion in the molten slag and electromigration in the ZrO2 solid electrolyte for the O2- are not rate-determining steps of electrochemical reduction reaction process of electroactive ions. It is feasible to study electrochemical behavior of Ni2+ in the molten slag with the aid of the electrolytic cell with a controlled oxygen flow under the present experimental conditions. The reduction of Ni2+ on the Ir electrode in the molten slag is found to be a reversible reaction with a single step, and the rate of the process is diffusion controlled. Two diffusion coefficients of Ni2+ in the molten slag containing 3%NiO derived respectively from CV and CP are (3.50±0.18)×10-6 and (2.80±0.22)×10-6 cm2/s, which are consistent with records in the relevant literatures.
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