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<p>A mathematical model for the blast furnace high-temperature zone was developed based on material–energy–exergy analyses to investigate thermodynamic behavior under high-alumina smelting conditions. The effects of temperature (<i>T</i>), direct reduction degree (rd), alumina content in the slag [<i>w</i>(Al<sub>2</sub>O<sub>3</sub>)], magnesium-to-alumina ratio [<i>w</i>(MgO)/<i>w</i>(Al<sub>2</sub>O<sub>3</sub>)], and basicity [<i>w</i>(CaO)/<i>w</i>(SiO<sub>2</sub>), <i>R</i>] on mineral phase evolution and exergy distribution were systematically examined. The results show that the exergy loss accounts for 8.21 pct of the total exergy input. The burden in the high-temperature zone is mainly composed of monoxide, melilite, olivine, and spinel phases. Among the investigated parameters, rd exerts a pronounced influence on both mineral phase composition and exergy distribution. Increasing <i>w</i>(Al<sub>2</sub>O<sub>3</sub>) raises the melting onset temperature and reduces the chemical exergy of the initial burden, whereas increasing<i> w</i>(MgO)/<i>w</i>(Al<sub>2</sub>O<sub>3</sub>) and <i>R</i> mitigates the decline in exergy input caused by increased <i>w</i>(Al<sub>2</sub>O<sub>3</sub>). This study provides thermodynamic insight into the high-temperature behavior of blast furnace ironmaking under high-alumina burden conditions and offers guidance for process optimization.</p>

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Mineral Phase Analysis and Exergy Distribution in High-Temperature Zone of High-Alumina Blast Furnace

  • 期刊论文

  • 发表日期：

    2026年2月4日

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  • Yan Zhang,
  • Haiyan Zheng,
  • Yahui Jiang,
  • Zhen Wang,
  • Xin Jiang,
  • Qiangjian Gao,
  • Fengman Shen

摘要

A mathematical model for the blast furnace high-temperature zone was developed based on material–energy–exergy analyses to investigate thermodynamic behavior under high-alumina smelting conditions. The effects of temperature (T), direct reduction degree (rd), alumina content in the slag [w(Al2O3)], magnesium-to-alumina ratio [w(MgO)/w(Al2O3)], and basicity [w(CaO)/w(SiO2), R] on mineral phase evolution and exergy distribution were systematically examined. The results show that the exergy loss accounts for 8.21 pct of the total exergy input. The burden in the high-temperature zone is mainly composed of monoxide, melilite, olivine, and spinel phases. Among the investigated parameters, rd exerts a pronounced influence on both mineral phase composition and exergy distribution. Increasing w(Al2O3) raises the melting onset temperature and reduces the chemical exergy of the initial burden, whereas increasing w(MgO)/w(Al2O3) and R mitigates the decline in exergy input caused by increased w(Al2O3). This study provides thermodynamic insight into the high-temperature behavior of blast furnace ironmaking under high-alumina burden conditions and offers guidance for process optimization.