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<p>This study investigates the reduction behavior and effect of refractories applied to reduction furnaces during hydrogen reduction steelmaking. Refractories composed of mullite and/or andalusite were heat treated for 72&#xa0;h at 1100&#xa0;°C in a 100% hydrogen atmosphere, considering the actual environment. Bar specimens were then prepared with mullite chamotte, andalusite, and SiO<sub>2</sub> along with other impurities such as Fe<sub>2</sub>O<sub>3</sub> and TiO<sub>2</sub> via sintering at 1350&#xa0;°C in air. Hydrogen reduction had a significant effect on some properties of the refractory, and the following changes were observed: (1) there was a color change due to the reduction of Fe<sub>2</sub>O<sub>3</sub> and TiO<sub>2</sub>, and (2) there was a change in fracture strength due to weight loss caused by the volatilization of reduction products (SiO and H<sub>2</sub>O). The change in strength of the amorphous SiO<sub>2</sub>-free refractory was negligible, owing to the obstruction of crack growth by the crystalline phase, despite the weight loss caused by hydrogen reduction.</p>

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Mechanical degradation of mullite- and andalusite-based refractories in hot hydrogen environment

  • 期刊论文

  • 发表日期：

    2025年4月15日

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  • Sung-Hyun Kim,
  • Jong-Won Woo,
  • Eun-Hee Kim,
  • Rae-Hyeong Park,
  • Sang-Bae Choi,
  • Sang-Chae Jeon

摘要

This study investigates the reduction behavior and effect of refractories applied to reduction furnaces during hydrogen reduction steelmaking. Refractories composed of mullite and/or andalusite were heat treated for 72 h at 1100 °C in a 100% hydrogen atmosphere, considering the actual environment. Bar specimens were then prepared with mullite chamotte, andalusite, and SiO2 along with other impurities such as Fe2O3 and TiO2 via sintering at 1350 °C in air. Hydrogen reduction had a significant effect on some properties of the refractory, and the following changes were observed: (1) there was a color change due to the reduction of Fe2O3 and TiO2, and (2) there was a change in fracture strength due to weight loss caused by the volatilization of reduction products (SiO and H2O). The change in strength of the amorphous SiO2-free refractory was negligible, owing to the obstruction of crack growth by the crystalline phase, despite the weight loss caused by hydrogen reduction.