简介概要

Phosphate enrichment mechanism in CaO–SiO2–FeO–Fe2O3–P2O5 steelmaking slags with lower binary basicity

来源期刊:International Journal of Minerals Metallurgy and Materials2016年第5期

论文作者:Jin-yan Li Mei Zhang Min Guo Xue-min Yang

文章页码:520 - 533

摘    要:The addition of silica to steelmaking slags to decrease the binary basicity can promote phosphate enrichment in quenched slag samples. In this study, we experimentally investigated phosphate enrichment behavior in CaO–SiO2–FeO–Fe2O3–P2O5 slags with a P2O5 content of 5.00% and the binary basicity B ranging from 1.0 to 2.0, where the(%FetO)/(%Ca O) mass percentage ratio was maintained at 0.955. The experimental results are explained by the defined enrichment degree 2 3C S C PR- of solid solution 2CaO·SiO2–3CaO·P2O5(C2S–C3P), where 2 3C S C PR- is a component of the developed ion and molecule coexistence theory(IMCT)–Ni model for calculating the mass action concentrations Ni of structural units in the slags on the basis of the IMCT. The asymmetrically inverse V-shaped relation between phosphate enrichment and binary basicity B was observed to be correlated in the slags under applied two-stage cooling conditions. The maximum content of P2O5 in the C2S–C3P solid solution reached approximately 30.0% when the binary basicity B was controlled at 1.3.

详情信息展示

Phosphate enrichment mechanism in CaO–SiO2–FeO–Fe2O3–P2O5 steelmaking slags with lower binary basicity

Jin-yan Li1,Mei Zhang1,Min Guo1,Xue-min Yang2

1. State Key Laboratory of Advanced Metallurgy, School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing2. Key Laboratory of Green Process and Engineering, Institute of Process Engineering, Chinese Academy of Sciences

摘 要:The addition of silica to steelmaking slags to decrease the binary basicity can promote phosphate enrichment in quenched slag samples. In this study, we experimentally investigated phosphate enrichment behavior in CaO–SiO2–FeO–Fe2O3–P2O5 slags with a P2O5 content of 5.00% and the binary basicity B ranging from 1.0 to 2.0, where the(%FetO)/(%Ca O) mass percentage ratio was maintained at 0.955. The experimental results are explained by the defined enrichment degree 2 3C S C PR- of solid solution 2CaO·SiO2–3CaO·P2O5(C2S–C3P), where 2 3C S C PR- is a component of the developed ion and molecule coexistence theory(IMCT)–Ni model for calculating the mass action concentrations Ni of structural units in the slags on the basis of the IMCT. The asymmetrically inverse V-shaped relation between phosphate enrichment and binary basicity B was observed to be correlated in the slags under applied two-stage cooling conditions. The maximum content of P2O5 in the C2S–C3P solid solution reached approximately 30.0% when the binary basicity B was controlled at 1.3.

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