Thermodynamic analysis of copper residue components reduction and the calculation of (FeO) activity as the slag of molten was researched. X-ray diffraction pattern reveals that fayalite(2FeO · SiO2) is the main phase presented in the slag. Thermodynamic analysis shows that the iron carbon reduction starting temperature decreases from 1042. 23K to 757. 47K when certain amount of CaO added to this copper slag; reduction of Mg, Al, Si and Ca can not take place; reduction degree of Fe2+ increases as O2- activity elevates. Activity calculation model for slag system of CaO-FeO-SiO2 indicates that activity of (FeO) increases to the maximum of 0.14 as the basicity of 2. 0.%对铜渣还原炼铁过程中各元素的反应热力学及渣处于熔融状态时(FeO)组分作用浓度分别进行了理论分析.XRD分析结果显示铜渣中含铁物相主要为铁橄榄石(2FeO·SiO2).热力学分析结果表明,铜渣中添加一定量CaO,(2FeO · SiO2)还原反应理论起始温度由1042.23K降至757.47K;渣中Mg、Al、Si和Ca 4种元素的还原反应不能发生；增加熔池中O2-浓度,Fe2+还原限度升高.FeO-SiO2-CaO三元渣系作用浓度模型计算结果显示,熔池碱度为2.0时,(FeO)组分作用浓度达到最大0.14.
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