Comparison study on hot state modification of converter slag by adding Al2O3 or SiO2

Yu-feng Tian; Guang-qiang Li; Yong-qian Li; Yu Liu

doi:10.1007/s42243-023-01172-4

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Journal of Iron and Steel Research International ›› 2024, Vol. 31 ›› Issue (11) : 2684-2692. DOI: 10.1007/s42243-023-01172-4

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Comparison study on hot state modification of converter slag by adding Al₂O₃ or SiO₂

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Abstract

The value-added utilization of converter steel slag is crucial, with China’s annual production having reached 100 million tons. The utilization of converter slag in the construction materials sector is limited as it undergoes volume expansion during the aging process, mainly caused by the hydration reaction of free calcium oxide present in the slag. The influence of alumina addition on the mineral transformation of typical industrial converter slag was investigated. Different quantities of alumina were introduced into the slag, and the original and modified slags were remelted under argon atmosphere, followed by quenching. The experimental results were compared with thermodynamic simulation calculations for further analysis. As the alumina content increases, it reacts with the free calcium oxide in slag, leading to the formation of lowmelting- point calcium aluminoferrite. Additionally, alumina addition effectively reduces slag viscosity. Finally, an assessment of the energy consumption for alumina-modified and silica-modified converter slags was presented.

Key words

Converter slag / Free calcium oxide / Alumina addition / Viscosity / Energy consumption

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Yu-feng Tian, Guang-qiang Li, Yong-qian Li, et al. Comparison study on hot state modification of converter slag by adding Al₂O₃ or SiO₂[J]. Journal of Iron and Steel Research International, 2024, 31(11): 2684-2692 https://doi.org/10.1007/s42243-023-01172-4

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