Influence of Fe x O y and Al 2 O 3 Contents on the Thermal Stability of Iron Ore-Waste Fibers: Key Mechanisms and Control

• Published in: Materials Vol. 17; no. 14
• Main Authors: Li, Xiaoguang, Wang, Xiaohui, Fang, Xianju, Shen, Xianglong, Huang, Liding, Qin, Jinyi, Fu, Wanzhang, Li, Weiguang
• Format: Journal Article
• Language: English
• Published: Switzerland 14-07-2024
• Subjects: iron-ore waste; FexOy; thermal stability; bridged oxygen; glass transition temperature
• ISSN: 1996-1944; 1996-1944

Traditional rock wool fibres are susceptible to crystallization and pulverization. To mitigate this, glass fibres were produced from iron ore waste (IOW). When the ratio of Fe
and Fe
is 1:3 and the Al
O
content is 10 wt.%, increasing the Fe
O
content enhances the thermal stability.At an Fe
O
content of 17-19% and an Al
O
content of 10-13%, the glass transition temperature (Tg) peaked. Increasing the Fe
O
content from 10% to 20% enhanced the stability of Si-O and Al-O bonds and increased bridged oxygen, stabilizing the structure. Here, Fe
balances structural charges, while Fe
replaces some Al atoms in the network. When the Al
O
content is 10-13% and the Fe
O
content is 17-19%, the thermal stability of the IOW rock glass reaches its optimal level. At 20% Fe
O
content, the structure becomes three-dimensional and cyclic, increasing polymerization. Consequently, incorporating Fe
O
alongside a 10% Al
O
content improves thermal stability, supporting the development of high-stability rock wool from IOW. This approach also enhances the refractory properties of rock wool fibres within the Fe
O
-Al
O
-SiO
-MgO-CaO system.