Migration Behavior of Components in Converter Slag during Smelting Reduction Process Using Aluminum Dross

Abstract

In order to efficiently recycle valuable element from the molten converter slag and enhance utilization ratio and added value of the slag, a novel aluminothermic smelting reduction process using aluminum dross as reductant was investigated from component migration and reduction kinetics, meanwhile the reduction mechanism of smelting reduction process of molten converter slag using aluminum dross was discussed. The results showed that the reduction of FeO firstly occurred with the Al/(FeO+MnO+P₂O₅) mass ratio≤0.27, and MnO began to be reduced with the ratio increasing to 0.33. Further increasing the ratio to 0.40, P₂O₅ could be reduced from the molten slag. Moreover, the contents of FeO, MnO and P₂O₅ in molten slag decreased sharply within the first 4 min, 6 min, and 6 min respectively and stabilized thereafter, and the Al₂O₃ content was increased dramatically over the first 6 min and followed by a continuity increase. Recovery of metal was increased to a maximum of 99.32% with the mass ratio increasing, and the crude alloy content containing Fe, Mn, and P was up to 93.31%, 1.98%, and 4.72%, respectively.