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Abstract <p>In this study, mullite was synthesized using the solid-phase sintering method, with coal gangue acid leaching residue serving as the silicon source and analytically pure alumina as the aluminum source. A critical aspect of the solid-phase sintering process is the effective mixing of raw materials containing silicon and aluminum components, which include hydroxides, silicon-aluminum oxides, and various types of silicates. During the calcination process, these raw materials undergo a diffusion reaction at elevated temperatures, where silicon, aluminum, and oxygen ions interdiffuse, ultimately leading to the formation of a mullite crystal structure. This paper investigates the effects of calcination temperature, holding time, and the Al/Si ratio on the synthesis of mullite products.</p>

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Study on Preparation of Mullite Refractory from Acid Leaching Residue of Coal Gangue

  • 期刊论文

  • 发表日期：

    2025年7月1日

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  • Ai-Chun Zhao,
  • Chen-Hui Zhao,
  • Chen-Jia Liu,
  • Lin-Jie Qin,
  • Tian-Rui Yun,
  • Bao-Ren Wang,
  • Wen-Yan Tian

摘要

Abstract

In this study, mullite was synthesized using the solid-phase sintering method, with coal gangue acid leaching residue serving as the silicon source and analytically pure alumina as the aluminum source. A critical aspect of the solid-phase sintering process is the effective mixing of raw materials containing silicon and aluminum components, which include hydroxides, silicon-aluminum oxides, and various types of silicates. During the calcination process, these raw materials undergo a diffusion reaction at elevated temperatures, where silicon, aluminum, and oxygen ions interdiffuse, ultimately leading to the formation of a mullite crystal structure. This paper investigates the effects of calcination temperature, holding time, and the Al/Si ratio on the synthesis of mullite products.