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<p>Bauxite residue is an alkaline solid waste generated during alumina production, characterized by substantial quantities and low utilization rates, which pose significant threats to ecological health and the safety of human life and property. The reductive Bayer digestion process has produced a novel type of bauxite residue, simultaneously improving alumina extraction ratio and creating more opportunities for the resource recovery of bauxite residue. This study employs the Tescan Integrated Mineral Analyzer system (TIMA), as the primary methodology to characterize the mineral composition and elemental distribution of Guinea high-iron bauxite, and its lime-digested and reductive Bayer bauxite residues. The research contrasts the concentration and particle size of specific minerals present in lime-digested and reductive Bayer bauxite residues. By accurately analyzing the phase transformations of minerals such as Al-goethite and rutile during the reductive Bayer digestion process, the mechanisms on the enhancement of the alumina digestion ratio and the separation efficiency of iron minerals can be better demonstrated. The percentage of hematite liberation degree over 70% was found to be 70.34% and 97.55%, respectively. The hematite in The authors declare that they have no conflict of interest. Reductive Bayer bauxite residue exhibits a coarser particle size. Utilizing gravity and magnetic separation for the beneficiation of iron minerals, the yield and total iron grade (TFe) of concentrates were 28.30% and 54.35% for the lime-digested bauxite residue and 65.05% and 55.98% for the reductive bauxite residue, respectively. Guinea bauxite exhibits a rich content of iron (Fe), vanadium (V), titanium (Ti), and rare-earth elements, with V, Ti, Ce, La, and other elements co-enriched in rutile/anatase and ilmenite. During the reductive Bayer digestion process, some valuable elements retain their original mineralization, leading to an increased concentration. This paper provides data on the mineral evolution and iron mineral separation from bauxite residue.</p>

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Critical Mineral Evolution and Beneficiation Properties of a Novel Gibbsitic Bauxite Residue: A TIMA-Based Characterization

  • 期刊论文

  • 发表日期：

    2026年1月5日

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  • Yuguan Zhang,
  • Guotao Zhou,
  • An Yang,
  • Yong Wang,
  • Tiangui Qi,
  • Qiusheng Zhou,
  • Yilin Wang,
  • Xiaobin Li

摘要

Bauxite residue is an alkaline solid waste generated during alumina production, characterized by substantial quantities and low utilization rates, which pose significant threats to ecological health and the safety of human life and property. The reductive Bayer digestion process has produced a novel type of bauxite residue, simultaneously improving alumina extraction ratio and creating more opportunities for the resource recovery of bauxite residue. This study employs the Tescan Integrated Mineral Analyzer system (TIMA), as the primary methodology to characterize the mineral composition and elemental distribution of Guinea high-iron bauxite, and its lime-digested and reductive Bayer bauxite residues. The research contrasts the concentration and particle size of specific minerals present in lime-digested and reductive Bayer bauxite residues. By accurately analyzing the phase transformations of minerals such as Al-goethite and rutile during the reductive Bayer digestion process, the mechanisms on the enhancement of the alumina digestion ratio and the separation efficiency of iron minerals can be better demonstrated. The percentage of hematite liberation degree over 70% was found to be 70.34% and 97.55%, respectively. The hematite in The authors declare that they have no conflict of interest. Reductive Bayer bauxite residue exhibits a coarser particle size. Utilizing gravity and magnetic separation for the beneficiation of iron minerals, the yield and total iron grade (TFe) of concentrates were 28.30% and 54.35% for the lime-digested bauxite residue and 65.05% and 55.98% for the reductive bauxite residue, respectively. Guinea bauxite exhibits a rich content of iron (Fe), vanadium (V), titanium (Ti), and rare-earth elements, with V, Ti, Ce, La, and other elements co-enriched in rutile/anatase and ilmenite. During the reductive Bayer digestion process, some valuable elements retain their original mineralization, leading to an increased concentration. This paper provides data on the mineral evolution and iron mineral separation from bauxite residue.