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Effect of Low-Melting-Point Calcium Aluminate Flux Prepared by Electrofusion Method on the Fluxing Capability and Desulfurization Capability of CaO-Al2O3- Based Desulfurizers

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Abstract:

This study investigates the synthesis of low-melting-point calcium aluminate fluxes via the electrofusion of recycled aluminum dross and CaO, aiming to develop a sustainable alternative to CaF2 in secondary steel refining. Seven flux formulations with a target CaO/Al2O3 ratio of 0.92 and varying additions of B2O3 (0–5 wt.%) and MgO (0–3 wt.%) were characterized using XRD and DTA. The results indicate that the synergistic effect of B2O3 and MgO promotes the formation of the C12A7 phase, effectively lowering the melting point by up to 167°C compared to additive-free formulations. When integrated into CaO/Al2O3-based desulfurizers, the optimal flux (3 wt.% B2O3 and 3 wt.% MgO) demonstrated superior fluxing kinetics and achieved a desulfurization efficiency of 52–55% within 20 minutes, which is highly comparable to the performance of conventional 10 wt.% CaF2-bearing agents (57%). This research provides a dual solution for high-value aluminum dross recycling and the development of eco-friendly, fluoride-free steel refining agents.

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Periodical:

Advances in Science and Technology (Volume 180)

Pages:

83-88

DOI:

https://doi.org/10.4028/p-Lj9VlX

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Online since:

July 2026

Authors:

Shao Feng Luo*, Weite Wu, Chi Ming Lin

Keywords:

C12A7 Phase, Desulfurization Ability, Fluxing Ability, Low Melting Point Calcium Aluminate Electrofusion Parameters, Recycled Aluminum Dross

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© 2026 Trans Tech Publications Ltd. All Rights Reserved

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