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Conference Proceedings

Iron Ore and Open Pit Operators Conference Proceeding 2026

Conference Proceedings

Iron Ore and Open Pit Operators Conference Proceeding 2026

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Characterisation of low-grade and complex iron ore stockpile (Thabazimbi, South Africa) and identification of possible beneficiation strategies

As high-grade iron ore reserves continue to decline, attention shifts towards the beneficiation of low grade, complex iron ores to supply the growing demand for steel. This study presents a comprehensive characterisation of low-grade iron ore deposits using optical microscopy, X-ray diffraction (XRD), geo-elemental analysis, and liberation size determination through SEM-based automated mineralogy (AMICS). The results reveal hematite and goethite as the major iron-bearing minerals, with quartz and kaolinite as the principal gangue phases, and notable occurrences of Fe bearing silicates and carbonates such as aegirine, biotite, and siderite. Bulk chemical analysis indicates an average composition of approximately 40 wt per cent Fe, 32 wt per cent SiO2, and 3 wt per cent LOI. Liberation analysis shows that effective mineral liberation occurs below 250 µm and 80 µm for the two ore types examined. Based on these findings, a beneficiation flow sheet was proposed, incorporating spiral concentration as a pre-concentration stage followed by reverse cationic flotation as the primary concentration step. The developed process produced concentrates containing over 60 wt per cent Fe and less than 10 wt per cent combined SiO2 + Al2O3, demonstrating its potential for generating high-quality iron ore suitable for direct reduction (DRI) feed.
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  • Characterisation of low-grade and complex iron ore stockpile (Thabazimbi, South Africa) and identification of possible beneficiation strategies
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  • Published: 2026
  • Pages: 6
  • PDF Size: 0.409 Mb.
  • Unique ID: P-05397-K2W5P4

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