Original scientific paper

Effect of ludwigite (B₂O₃) on high Al₂O₃ slag and its mechanism used as a new blast furnace welding flux

B. Dai ; State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Panzhihua, Sichuan, China
H. Long ; Key Laboratory of Metallurgical Emission Reduction & Resources Recycling, Anhui University of Technology, Ministry of Education, Maanshan, Anhui, China; Anhui Province Key Laboratory of Metallurgical Engineering & Resources Recycling, Anhui University of Technology, Maanshan, Anhui, China
Y. Wen ; State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization, Panzhihua, Sichuan, China
Y. Ji ; Key Laboratory of Metallurgical Emission Reduction & Resources Recycling, Anhui University of Technology, Ministry of Education, Maanshan, Anhui, China; Anhui Province Key Laboratory of Metallurgical Engineering & Resources Recycling, Anhui University of Technology, Maanshan, Anhui, China

Abstract

Based on the measurement of viscosities and critical temperatures of CaO-MgO-SiO₂- Al₂O₃-B₂O₃ slag system with various B2O3 contents, the slag with higher than 15 mas. % Al₂O₃ content has the lowest critical temperature and the widest solid-liquid coexisting region at about 2,0 mas. % B₂O₃. Furthermore, the X-ray diffractometer (XRD) result verified that bechilites whose melting point are low forms. Raman spectra revealed that the effect of network forming on viscosity is smaller than the effect of bechilites, which leads to the slag viscosity decrease with B₂O₃ addition. Base on the above research, so ludwigite can meet the requirements of a BF welding flux to decrease the critical temperature and improve the fluidity of the high Al₂O₃ slag.

Keywords

blast furnace; hearth activity; high Al₂O₃ slag; B₂O₃

Hrčak ID:

241158

URI

https://hrcak.srce.hr/241158

Publication date:

1.10.2020.

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