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Simultaneous Fabrication of Ti–Si Alloy and CA–CA2 Based Tailing Slag Cement via Aluminothermic Reduction of Ferrotitanium Slag

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Simultaneous Fabrication of Ti–Si Alloy and CA–CA2 Based Tailing Slag Cement via Aluminothermic Reduction of Ferrotitanium Slag

Xifei Zhang 1,2 Tu Long 1,2 Ding Chen 1,2,* Huazhi Gu 1,2 Ao Huang 1,2 Lvping Fu 1,2 Yongshun Zou 1,2 Shenghao Li 1,2 Xin Xiao 3

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1
State Key Laboratory of Advanced Refractories, Wuhan University of Science and Technology, Wuhan 430081, China
2
International Joint Laboratory on New Technologies of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
3
Ji’an Taihe Ecological and Environmental Monitoring Station, Ji’an 343700, China
*
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Received: 16 June 2026 Revised: 31 July 2026 Accepted: 20 August 2026 Published: 07 September 2026

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© 2026 The authors. This is an open access article under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/).

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High-Temp. Mater. 2026, 3(3), 10018; DOI: 10.70322/htm.2026.10018
ABSTRACT: Al2O3–TiO2–CaO-based ferrotitanium slag is a waste slag generated during ferrotitanium-alloy smelting. At present, the TiO2 resource (about 15 wt.%) in ferrotitanium slag has not been effectively utilized. In this study, aluminothermic reduction was used to extract Ti and prepare a Ti–Si alloy, while the low-density Al2O3–CaO-based molten tailing slag floating on the Ti–Si melt was separated to fabricate CA–CA2 tailing-slag cement. The TiO2 content decreased from 14.42 wt.% in the ferrotitanium slag to 1.63 wt.% in the tailing slag. The Ti–Si alloy was mainly composed of Ti5Si3 and Ti5Si4. The mineral composition and hydration behavior of the CA–CA2 tailing-slag cement were similar to those of commercial calcium aluminate cement Secar71. Under the adopted preparation and testing conditions, the mechanical strength of the tailing-slag cement paste reached approximately 85% of that of Secar71, indicating its potential as an alternative refractory binder. The co-production of Ti–Si alloy and CA–CA2 tailing-slag cement provides a potential route for the value-added utilization of ferrotitanium slag.
Keywords: Ferrotitanium slag; Ti extraction; Aluminothermic reduction; Ti–Si alloy; Tailing slag cement
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