熔分过程中铌、磷在渣铁两相间的分配比

以白云鄂博铌精矿经预还原后在电炉内熔分所形成的渣铁体系为研究对象，通过实验考察了熔分过程中铌、磷在渣铁两相间分配比的变化规律.结果表明，在本实验条件下，铌、磷的分配比随铁液中碳质量分数的增加而减小，当碳达到饱和时，铌氧化物会在渣铁界面处被还原为碳化铌，熔分终点w［C］应控制在342%以下;铌、磷的分配比随温度升高而减小，熔分温度可控制在1450℃左右;铌、磷的分配比随渣中FeO质量分数的增加而增大，熔分终点w(FeO)应控制在585%左右;铌、磷的分配比随熔渣光学碱度的升高而增大，添加MgO可明显降低磷的分配比.

Distribution Ratio of Niobium and Phosphorus Between Slag and Iron in the Melting Separation Process

The slag iron system which was formed in melting separation process of the pre reduction niobium concentrate of Bayan Obo with electric furnace was taken as a research object. The variation rule of the distribution ratio of niobium and phosphorus between the slag and iron during the melting separation process was investigated by experiment. The results showed that the distribution ratios of niobium and phosphorus decreased with the increase of w［C］， and w［C］should be controlled below 342% at end point of the melting separation process. The niobium oxides was reduced to NbC at the slag iron interface when carbon dissolved in iron saturated. The distribution ratios of niobium and phosphorus decreased with the increase of temperature， the temperature should be controlled at 1450℃ in the melting separation process. The distribution ratios of niobium and phosphorus increased with the increase of w(FeO)，and w(FeO)should be 585% at end point of the melting separation process. The distribution ratios of niobium and phosphorus increased with the increase of the optical basicity of the slag， the addition of MgO in slag greatly decreased the distribution ratio of phosphorus.