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<p>The growing demand for efficient resource utilization and risk management in the global mining and mineral processing sectors requires the integration of ore body characterization and geometallurgical characteristics. A spatial geometallurgical domain is key to identifying resource variability and addressing challenges in mineralogy and mineral processing. This study focuses on banded hematite jasper (BHJ) from the Precambrian Bonai-Keonjhar (BK) belt of eastern India, a mine overburden with significant potential, characterized by challenging mineralogical and geometallurgical attributes. BHJ comprises euhedral and specularitic hematite embedded in a fine siliceous matrix, requiring substantial energy for grinding and mineral liberation. The feed sample contained 42.84% Fe(T), 34.61% SiO<sub>2</sub>, 1.05% Al<sub>2</sub>O<sub>3</sub>, and 0.79% loss on ignition (LOI). A novel method involving magnetization roasting followed by water quenching enhances the separation of iron minerals by converting weakly magnetic minerals into strongly magnetic minerals. It is designed to enhance the dissociation of iron minerals while inducing porosity and fractures through thermal shock. Optimal results were achieved at 800&#xa0;°C, yielding 64.56% Fe(T) with significant recovery, while the reject shows a notable reduction in iron content. This study highlights the role of mineral phase transformations and geometallurgical texture modifications, enhancing beneficiation and providing energy-efficient solutions for sustainable resource utilization. Furthermore, this study will be a benchmark for future gas-based magnetization roasting technology, particularly concerning geometallurgical prospects, where CO and H<sub>2</sub> will act as reductants.</p>

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Magnetization Roasting for Enhancing the Iron Values of Banded Hematite Jasper: A Geometallurgical Case Study

  • 期刊论文

  • 发表日期：

    2025年5月22日

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  • Jyotirmayee Mahanta,
  • Subhabrata Mishra,
  • Chita Ranjan Mahanta,
  • Devananda Beura,
  • Prabhas Chandra Beuria

摘要

The growing demand for efficient resource utilization and risk management in the global mining and mineral processing sectors requires the integration of ore body characterization and geometallurgical characteristics. A spatial geometallurgical domain is key to identifying resource variability and addressing challenges in mineralogy and mineral processing. This study focuses on banded hematite jasper (BHJ) from the Precambrian Bonai-Keonjhar (BK) belt of eastern India, a mine overburden with significant potential, characterized by challenging mineralogical and geometallurgical attributes. BHJ comprises euhedral and specularitic hematite embedded in a fine siliceous matrix, requiring substantial energy for grinding and mineral liberation. The feed sample contained 42.84% Fe(T), 34.61% SiO2, 1.05% Al2O3, and 0.79% loss on ignition (LOI). A novel method involving magnetization roasting followed by water quenching enhances the separation of iron minerals by converting weakly magnetic minerals into strongly magnetic minerals. It is designed to enhance the dissociation of iron minerals while inducing porosity and fractures through thermal shock. Optimal results were achieved at 800 °C, yielding 64.56% Fe(T) with significant recovery, while the reject shows a notable reduction in iron content. This study highlights the role of mineral phase transformations and geometallurgical texture modifications, enhancing beneficiation and providing energy-efficient solutions for sustainable resource utilization. Furthermore, this study will be a benchmark for future gas-based magnetization roasting technology, particularly concerning geometallurgical prospects, where CO and H2 will act as reductants.