Effect of the Slag Composition on the Sustainable Silicothermic Synthesis Process of Titanium Silicides

Ziyou Yu, Jie Dang () and Zhiyuan Chen ()
Additional contact information
Ziyou Yu: cMACS, M2S, KU Leuven, Celestijnenlaan 200F, 3001 Leuven, Belgium
Jie Dang: National Engineering Research Center for Magnesium Alloys, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China
Zhiyuan Chen: Electrochemistry Excellence Centre (ELEC), Materials & Chemistry Unit, Flemish Institute for Technological Research (VITO), Boeretang 200, 2400 Mol, Belgium

Sustainability, 2025, vol. 17, issue 9, 1-14

Abstract: TiSi 2 and Ti 5 Si 3 were synthesized through a simple and cost-effective process, providing a sustainable way to recycle titanium oxide and silicon wastes from industry. The reaction process was investigated at 1500 °C under various slag/silicon ratios and slag compositions. TiSi 2 was synthesized successfully under all experimental conditions, with nearly complete extraction of titanium oxide from the slag within 5 h under optimized conditions. TiSi 2 initially formed at the slag/silicon interface, followed by the formation of Ti 5 Si 3 as TiSi 2 droplets fell through the slag. The production rate of TiSi 2 was higher than that of Ti 5 Si 3 . Kinetic analysis showed that the reaction rate constant ranged from 1.2 × 10 −5 to 4.3 × 10 −4 s −1 . Viscosity and basicity were not the limiting factors of the kinetics in this work. The amount of TiO 2 in the slag significantly influenced the reaction process, with slag containing less than 30 mol% TiO 2 identified as optimal for efficient titanium extraction and a high synthesis rate.

Keywords: titanium-bearing blast furnace slag; spent SCR denitration catalyst; silicon waste; secondary resources; synthesis process (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2025
References: Add references at CitEc
Citations:

Downloads: (external link)
https://www.mdpi.com/2071-1050/17/9/3994/pdf (application/pdf)
https://www.mdpi.com/2071-1050/17/9/3994/ (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:gam:jsusta:v:17:y:2025:i:9:p:3994-:d:1645319

Access Statistics for this article

Sustainability is currently edited by Ms. Alexandra Wu

More articles in Sustainability from MDPI
Bibliographic data for series maintained by MDPI Indexing Manager ().