Abstract：Aluminum ash was one of important auxiliary materials for iron making. It could absorb the inclusions in molten steel to improve the quality. Moreover, the metallic aluminum in aluminum ash played the role of deoxidization, thus reducing the gas contents and inclusions in steel, and also improving the cleanliness and mechanical property of steel. Therefore, the phase separation of metallic aluminum and aluminum oxide in aluminum ash had important significance for the accurate determination of metallic aluminum content. The sample was dissolved with ferric trichloride solution under electromagnetic stirring to separate metallic aluminum and aluminum oxide. Metallic aluminum was transferred into the solution in the form of ions. The interference elements such as iron and manganese were separated from the solution by strong base. Al3+ was complexed with excessive EDTA, and the excessive EDTA was titrated with zinc standard solution at pH 4.5-5.5 using xylenol orange as the indicator. Then F- was added to complex EDTA to replace Al3+, and the released EDTA was titrated with zinc standard solution. Consequently, the content of metallic aluminum could be calculated. The sample dissolution conditions were obtained by orthogonal test as follows: the mass concentration and dosage of ferric trichloride solution was 100g/L and 100mL, respectively; the mass of sample was 0.5000g; the stirring time was 60min. The results showed that the relative standard deviations (RSD, n=8) of determination results were between 0.45% and 0.78%. The recoveries were between 96% and 101%. The proposed method could meet the determination requirements of aluminum ash with metallic aluminum in range of 10%-30% (mass fraction).
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