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<p>The refractory castables significantly improved in density by incorporating micro-powders and high-efficiency dispersants in the past two decades, which was believed to contribute to corrosion resistance and bonding strength. However, the accompanying low permeability became a significant challenge for the workability of bulk and has a potential explosion risk during the initial baking. In this work, the influence of aluminum lactate additive on the hydration-dehydration behaviors of the cement bonded Al<sub>2</sub>O<sub>3</sub>-MgO refractory castables was investigated. The results indicated that adding aluminum lactate to the Al<sub>2</sub>O<sub>3</sub>-MgO castables affected the hydration pathway of cement by reducing the formation of gel-like AH<sub>3</sub>. It decreased blockage in exhaust channels and promoted the formation of irregular calcium aluminate hydrates (instead of C<sub>3</sub>AH<sub>6</sub> phases) which decomposed at a lower and broader temperature ranges. The hydration behaviors led to a significant improvement in the resistance to spalling during the heating phase. Furthermore, the addition of aluminum lactate also had an impact on the setting time and mechanical strength of the aluminum lactate-containing sample, due to the altered hydration-dehydration phases in the castable’s matrix.</p>

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An approach to optimize the drying behavior and explosion resistance in Al2O3-MgO refractory castables: role of aluminum lactate

  • 期刊论文

  • 发表日期：

    2025年9月9日

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  • Yulong Wang,
  • Yaping Cao,
  • Hui Yang,
  • Yanan Song,
  • Yaoying Wu,
  • Guoping Wei,
  • Binxiang Fang,
  • Wen Yan,
  • Nan Li,
  • Junfeng Chen

摘要

The refractory castables significantly improved in density by incorporating micro-powders and high-efficiency dispersants in the past two decades, which was believed to contribute to corrosion resistance and bonding strength. However, the accompanying low permeability became a significant challenge for the workability of bulk and has a potential explosion risk during the initial baking. In this work, the influence of aluminum lactate additive on the hydration-dehydration behaviors of the cement bonded Al2O3-MgO refractory castables was investigated. The results indicated that adding aluminum lactate to the Al2O3-MgO castables affected the hydration pathway of cement by reducing the formation of gel-like AH3. It decreased blockage in exhaust channels and promoted the formation of irregular calcium aluminate hydrates (instead of C3AH6 phases) which decomposed at a lower and broader temperature ranges. The hydration behaviors led to a significant improvement in the resistance to spalling during the heating phase. Furthermore, the addition of aluminum lactate also had an impact on the setting time and mechanical strength of the aluminum lactate-containing sample, due to the altered hydration-dehydration phases in the castable’s matrix.