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<p>Due to the global energy shortage, it has become essential to reduce energy consumption in the steelmaking process in order to promote the sustainable development of the metallurgical industry. The limitations of traditional ladle insulation materials were addressed by using kaolin as the main raw material in combination with foam-gelcasting technique for in-situ synthesis of porous anorthite thermal insulation materials. Concurrently, the effects of sintering temperature and time on the composition of the physical phases, microstructure and physical properties were elucidated. The results showed that anorthite was the main phase obtained in sintering temperature range of 1200–1450&#xa0;°C, and edges of anorthite grains were well defined and well developed, presenting a plate-like morphology, which significantly improved mechanical strength of sample. The best overall performance was achieved at a firing temperature of 1400&#xa0;°C and a holding time of 3&#xa0;h. Compared to conventional ladle thermal insulation materials, samples developed herein showed excellent performance with a porosity of 63.3%, a compressive strength of 14.51&#xa0;MPa, and an ultra-low thermal conductivity of only 0.29&#xa0;W/(m K).</p>

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High-value recycling of kaolin for preparation of ladle thermal insulation materials

  • 期刊论文

  • 发表日期：

    2025年8月14日

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  • Xiang Li,
  • Zhi Sun,
  • Wu-yang Shi,
  • Wei-wei Lu,
  • Ya-meng Wan,
  • Cheng-liang Ma

摘要

Due to the global energy shortage, it has become essential to reduce energy consumption in the steelmaking process in order to promote the sustainable development of the metallurgical industry. The limitations of traditional ladle insulation materials were addressed by using kaolin as the main raw material in combination with foam-gelcasting technique for in-situ synthesis of porous anorthite thermal insulation materials. Concurrently, the effects of sintering temperature and time on the composition of the physical phases, microstructure and physical properties were elucidated. The results showed that anorthite was the main phase obtained in sintering temperature range of 1200–1450 °C, and edges of anorthite grains were well defined and well developed, presenting a plate-like morphology, which significantly improved mechanical strength of sample. The best overall performance was achieved at a firing temperature of 1400 °C and a holding time of 3 h. Compared to conventional ladle thermal insulation materials, samples developed herein showed excellent performance with a porosity of 63.3%, a compressive strength of 14.51 MPa, and an ultra-low thermal conductivity of only 0.29 W/(m K).