Effect of Al₂O₃ on the Glass-Ceramics of CaO-SiO₂-MgO-Al₂O₃ System Based on BOF Slag

Abstract:

Directly recycling residual iron element in modified BOF slag after reduction and manufacturing glass-ceramics from these remaining inorganic slag materials is an effective way to reuse the waste heat and slag materials of hot BOF slag. In the glass-ceramics, the Al₂O₃ has an important influence on the slag viscosity and the physical and chemical properties of glass-ceramics. In this paper, glass-ceramics with a basicity of 0.7 and a MgO content of 9~12% were prepared by using chemically pure reagents according to the CaO-SiO₂-MgO phase diagram, and the effect of different Al₂O₃ content on the parent glass crystallization and glass-ceramic performances was studied. Results show that the flexural strength of glass-ceramics is mainly affected by the sintering shrinkage. When the weight content of Al₂O₃ exceeds 15%, both the flexural strength and the shrinkage rate reached the maximum, and dense microstructure was obtained. In addition, the original dominant crystal structure is affected while Al₂O₃>12%, with the anorthite crystal phase appearing consequently.

• Periodical: Advanced Materials Research (Volume 833)
• Pages: 208-212
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.833.208
• Online since: November 2013
• Authors: Wen Bin Dai, Yu Li, Yuan Yuan Zhou, Da Qiang Cang, Yong Fan
• Keywords: Al₂O₃, BOF Slag, Chemically Pure Reagent, Glass-Ceramics

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