Original scientific paper

Reaction mechanism analysis of the Al₂O₃ in blast furnace (BF) slag

J. H. Liu ; University of Science and Technology Liaoning, Anshan, China
Q. Wang ; University of Science and Technology Liaoning, Anshan, China
Z. J. He ; University of Science and Technology Liaoning, Anshan, China
C. Y. Sun ; University of Science and Technology Liaoning, Anshan, China
Z. Zhuang ; University of Science and Technology Liaoning, Anshan, China

Abstract

Al₂O₃ is one of the main component in blast furnace (BF) slag, which the reaction mechanism influence on the metallurgical performance directly in the process of the slag forming. In the paper, ΔG_fθ was used to analyzed the slag formation reaction process of the Al₂O₃, at the same time, the phase diagram and activity were calculated by Fact-Sage with CaO - MgO – SiO₂ - Al₂O₃ slag system, it can be found that the complete liquid phase region temperature is about 1 500°C and the content of the Al₂O₃ is 11%. Activity of CaO is stronger than the others, from which the liquid phase can be formed easily in the high temperature, meantime the reaction energy barrier between CaO and SiO₂ is lower and stabilization of the product is better. By the high temperature experiment, a lot of Ca₂Al₂SiO₇ was separated out with the high content of Al₂O₃ and slag basicity, as a result, the transformation of the solid phase to the liquid phase was effected by the constantly increasing the content of Al₂O₃ .

Keywords

blast furnace; Al₂O₃ content; slag formation reaction; crystallization; melting temperature

Hrčak ID:

224737

URI

https://hrcak.srce.hr/224737

Publication date:

1.1.2020.

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