Iron recovery and active residue production from basic oxygen furnace (BOF) slag for supplementary cementitious materials

Abstract In this study, a new method for recycling basic oxygen furnace (BOF) slag was proposed. An additive mixture containing kaolin and carbon powder was designed and mixed with BOF slag to induce the reduction of ferric oxides. Iron metal was then recovered from the BOF slag. The additives acted as a component regulator to improve the reactivity of the residue after recovering iron. The results showed that as the basicity of the mixture of BOF slag and additives decreased, the melting temperature of the mixture decreased, whereas the iron recovery efficiency was significantly improved. In fact, when the basicity ranged from 0.97 to 1.31, the iron recovery efficiency reached more than 95%. Additionally, decreasing the basicity of the mixture increased the viscosity of the melt and the extent of the glassy phase formed in the residue during water quenching The maximum percentage of the glassy phase in the residue could reach more than 95%. Accordingly, the reactivity index was high, indicating that the residue from the mixture of BOF slag and the additives after recovering iron can be used as an active supplementary cementitious material.

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