Thermodynamic Activity of B2O3 in CaO–SiO2–Al2O3–B2O3–MnO–MgO Molten Slags at 1723 K

This study aimed to investigate the thermodynamic characteristics of the reaction between Al and B 2 O 3 in the continuous casting process of high-aluminum steel. The activity coefficient of B 2 O 3 in molten slag of (31.1 to 58.4) pct CaO–(0.2 to 16.7) pct SiO 2 –(14.7 to 49.2) pct Al 2 O 3 –(0 to...

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Bibliographic Details
Published in:Metallurgical and materials transactions. B, Process metallurgy and materials processing science Process metallurgy and materials processing science, 2023-10, Vol.54 (5), p.2737-2746
Main Authors: Chen, Jian-bin, Che, Hao-jie, Zhao, Ming-hui, Pan, Wen-bo, Chen, Zhi-yu, Liu, Hai-dong
Format: Article
Language:English
Subjects:
Activity coefficients
Aluminum
Aluminum oxide
Basicity
Boron oxides
Calcium fluoride
Calcium oxide
Characterization and Evaluation of Materials
Chemistry and Materials Science
Continuous casting
Heat treating
Magnesium oxide
Manganese oxides
Materials Science
Metallic Materials
Nanotechnology
Optimization
Original Research Article
Regression analysis
Silicon dioxide
Slag
Steel making
Structural Materials
Surfaces and Interfaces
Thermodynamics
Thin Films
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Summary:This study aimed to investigate the thermodynamic characteristics of the reaction between Al and B 2 O 3 in the continuous casting process of high-aluminum steel. The activity coefficient of B 2 O 3 in molten slag of (31.1 to 58.4) pct CaO–(0.2 to 16.7) pct SiO 2 –(14.7 to 49.2) pct Al 2 O 3 –(0 to 30.3) pct B 2 O 3 –(0 to 10.5) pct CaF 2 –(2.1 to 4.7) pct MgO–(0 to 1.8) pct MnO slags was measured at 1450°C using B equilibrium experiments between liquid copper and molten slag in a graphite crucible under the mixed gas atmosphere of CO and Ar. The effects of B 2 O 3 , Al 2 O 3 , SiO 2 , and CaF 2 and the basicity ( B  = mass pct CaO/(mass pct SiO 2 +mass pct Al 2 O 3 ) on the activity coefficient of B 2 O 3 in molten slag were discussed. Regression analysis was used to investigate the quadratic relationship between the activity coefficient of B 2 O 3 and the concentrations of components in the slag. The results indicated that (a) the activity coefficient of B 2 O 3 increased with an increase in B 2 O 3 when B 2 O 3  > 7 pct and B   7 pct and B  > 1. (b) When B  > 0.9 and Al 2 O 3  > 26 pct, the activity coefficient of B 2 O 3 went up with the increase of Al 2 O 3 , but decreased when B  
ISSN:1073-5615
1543-1916
DOI:10.1007/s11663-023-02870-w