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Effect of Al 2 O 3 on the Melting, Viscosity, and Phosphorus Distribution of CaO–SiO 2 –Fe 2 O 3 –P 2 O 5 Slag System
Author(s) -
Xie Senlin,
Wang Wanlin,
Pan Zihang,
Li Hongchao,
Huang Daoyuan,
Du Yong
Publication year - 2018
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201700516
Subject(s) - slag (welding) , viscometer , viscosity , materials science , phase (matter) , phosphorus , analytical chemistry (journal) , melting temperature , thermocouple , metallurgy , precipitation , mineralogy , chemistry , composite material , chromatography , physics , organic chemistry , meteorology
An investigation is conducted to study the effect of Al2O3 on the melting, viscosity, and phosphorus distribution of CaO–SiO2–Fe2O3–P 2 O 5 slag system by using Single Hot Thermocouple Technique and rotating cylinder viscometer. The results show that with the addition of Al 2 O 3 content, the melting temperature range of slag system is first reduced and then increased, as the added Al 2 O 3 may react with CaO to form different compounds with varied melting points. The slag viscosity increases with the addition of Al 2 O 3 content, due to the fact that the polymerization degree of the melt slag is getting increased. Besides, the addition of Al 2 O 3 can improve the mass percentage of P 2 O 5 in the solid phase, but it may reduce the dephosphorization capacity of the slag due to the reduction of the total solid phase solution (2CaO · SiO 2 –n3CaO · P 2 O 5 ) precipitation. The results of this study can elucidate the effect of Al 2 O 3 on the property of dephosphorization slag and provide guidelines for the new slag design to achieve a better hot metal dephosphorization efficiency.