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<p>Regarding the problems of low aluminum–iron separation efficiency and serious pollution of red mud emission in the traditional treatment process of high iron bauxite, this study adopts an innovative one-step calcification–biomassification transformation means to treat high-iron bauxite, which synchronously realizes the dissolution of high-iron bauxite, the transformation of calcification, and the magnetic transformation of the iron phase. At the optimal reduction conditions with an experimental temperature of 280&#xa0;°C, a Na<sub>2</sub>O concentration of 250&#xa0;g/L, a Ca/Si of 1.5, an L/S of 4, and a biomass ratio of 1:4, the dissolution rate of Al<sub>2</sub>O<sub>3</sub> in the transformed slag reached 89.7%. All of the Fe<sub>2</sub>O<sub>3</sub> was reduced to Fe<sub>3</sub>O<sub>4</sub>. In addition, the red mud, ω(Na<sub>2</sub>O), produced by treating bauxite ore by this method was reduced to 0.38 wt%, which can be used in the fields of construction and environmental protection to make cement, adsorbents, and other materials. This study provides a theoretical foundation and technological framework for the eco-friendly low-carbon processing of high-iron bauxite, while advancing the development of a circular economy model characterized by “waste-to-resource utilization in mineral processing”.</p>

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One-Step Calcification–Biomaterialization Transformation Process for Treating High-Iron Bauxite Ore

  • 期刊论文

  • 发表日期：

    2025年6月23日

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  • Yifan Fu,
  • Yiyong Wang,
  • Zhe Ning,
  • Xingjian Wang,
  • Qiushi Chai,
  • Renyun Zhang

摘要

Regarding the problems of low aluminum–iron separation efficiency and serious pollution of red mud emission in the traditional treatment process of high iron bauxite, this study adopts an innovative one-step calcification–biomassification transformation means to treat high-iron bauxite, which synchronously realizes the dissolution of high-iron bauxite, the transformation of calcification, and the magnetic transformation of the iron phase. At the optimal reduction conditions with an experimental temperature of 280 °C, a Na2O concentration of 250 g/L, a Ca/Si of 1.5, an L/S of 4, and a biomass ratio of 1:4, the dissolution rate of Al2O3 in the transformed slag reached 89.7%. All of the Fe2O3 was reduced to Fe3O4. In addition, the red mud, ω(Na2O), produced by treating bauxite ore by this method was reduced to 0.38 wt%, which can be used in the fields of construction and environmental protection to make cement, adsorbents, and other materials. This study provides a theoretical foundation and technological framework for the eco-friendly low-carbon processing of high-iron bauxite, while advancing the development of a circular economy model characterized by “waste-to-resource utilization in mineral processing”.