电解含有铁氧化物的熔融电解质提铁是一种钢铁冶炼短流程新工艺,该工艺可以减少甚至消除CO2排放.为测定熔渣中铁氧化物的分解电压,采用一端封闭的氧离子传导的氧化锆基固体电解质管内装熔渣,并以烧结在固体电解质管封闭端外侧表面的多孔铂金作为阳极,构建一种阴、阳极相互隔离的新型管状电解池.将该电解池的多孔铂金阳极置于恒定氧分压的气氛下,在熔渣中分别插入铱丝、铁棒作为阴极,利用线性扫描伏安法测定了1 723 K下SiO2CaO-MgO Al2O3熔渣中FeO的分解电压,研究了熔渣碱度、阴极材料以及阳极气氛氧分压等因素对FeO分解电压的影响.结果表明,增大熔渣碱度、阴极还原合金化以及降低电解产物气体O2的分压,均可降低FeO的分解电压,有利于FeO的电解.测定结果与采用FactSage 6.1热力学软件理论计算的结果一致.证实采用氧离子传导的固体电解质管构建新型管状电解池,测定固体电解质管内熔渣中氧化物的分解电压是可行的.
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