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<p>Guinean bauxite is considered a raw material for alumina production characterized by high iron and low silica content. However, the significant presence of aluminous goethite in the ore exhibits chemical inertness under conventional Bayer digestion conditions, leading to low alumina extraction efficiency. Additionally, the bauxite contains substantial amounts of hematite. Both minerals are lost in the bauxite residue during digestion, which not only results in low comprehensive resource utilization but also exacerbates environmental pressures and land occupation issues associated with residue stockpiling. Therefore, achieving efficient co-recovery of aluminum and iron resources from Guinean bauxite holds significant practical value and implications for resource conservation, environmental management, and economic enhancement. This study establishes a novel sugarcane bagasse-reducing digestion system. Bagasse serves as a key component of this system, and the reducing sugars naturally present in bagasse, along with those released during thermal decomposition, act as the primary driving force for the reduction process, functioning as efficient additives. Under digestion conditions of 260&#xa0;°C and 60&#xa0;min, the conversion of aluminous goethite improves the alumina recovery rate by 3.3%. Simultaneously, goethite and hematite in the residue undergo reduction and magnetization. Through magnetic separation at a field intensity of 300–400&#xa0;mT, an iron concentrate with a total iron grade &gt; 60% can be recovered from the bauxite residue, achieving an iron recovery rate exceeding 70%. This process not only reduces bauxite consumption by 85&#xa0;kg/t-AO but also yields a high-quality iron concentrate with a total iron grade &gt; 60% as a by-product. Furthermore, it effectively alleviates bauxite residue storage pressure and enhances comprehensive resource utilization, thereby achieving a balance among technical feasibility, environmental friendliness, and economic rationality.</p> Graphical Abstract <p></p>

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Research on Bauxite Residue Reduction Technology: Simultaneous Recovery of Aluminum and Iron Resources from Guinea Bauxite

  • 期刊论文

  • 发表日期：

    2026年2月25日

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  • Zegang Wu,
  • Jingjing Zhong,
  • Mingzhuang Xie,
  • Huaitao Zhang,
  • Hongliang Zhao,
  • Fengqin Liu

摘要

Guinean bauxite is considered a raw material for alumina production characterized by high iron and low silica content. However, the significant presence of aluminous goethite in the ore exhibits chemical inertness under conventional Bayer digestion conditions, leading to low alumina extraction efficiency. Additionally, the bauxite contains substantial amounts of hematite. Both minerals are lost in the bauxite residue during digestion, which not only results in low comprehensive resource utilization but also exacerbates environmental pressures and land occupation issues associated with residue stockpiling. Therefore, achieving efficient co-recovery of aluminum and iron resources from Guinean bauxite holds significant practical value and implications for resource conservation, environmental management, and economic enhancement. This study establishes a novel sugarcane bagasse-reducing digestion system. Bagasse serves as a key component of this system, and the reducing sugars naturally present in bagasse, along with those released during thermal decomposition, act as the primary driving force for the reduction process, functioning as efficient additives. Under digestion conditions of 260 °C and 60 min, the conversion of aluminous goethite improves the alumina recovery rate by 3.3%. Simultaneously, goethite and hematite in the residue undergo reduction and magnetization. Through magnetic separation at a field intensity of 300–400 mT, an iron concentrate with a total iron grade > 60% can be recovered from the bauxite residue, achieving an iron recovery rate exceeding 70%. This process not only reduces bauxite consumption by 85 kg/t-AO but also yields a high-quality iron concentrate with a total iron grade > 60% as a by-product. Furthermore, it effectively alleviates bauxite residue storage pressure and enhances comprehensive resource utilization, thereby achieving a balance among technical feasibility, environmental friendliness, and economic rationality.

Graphical Abstract