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<p>This study aims to develop a processing route to beneficiate manganiferrous iron ore and recover iron values for pellet-making. Studies on the separation of Mn from Fe have described the failure of gravity separation methods owing to the similar physical characteristics of Mn and Fe ores. Therefore this, the manganese-rich iron ores from the Sandur area, Karnataka, India, assayed 52.5% Fe, 5.2% Mn, 4.5% silica, 3.1% Al2O3, and 8.7% LOI and contained significant amounts of hematite, martitized magnetite, and goethite as iron ore minerals with subordinate amounts of psilomelane and pyrolusite as manganese gangue minerals and minor amounts of clay and quartz were subjected to beneficiation. The low manganese content in the iron ore concentrate acts as a good additive in iron ore pelletization to improve pellet strength. The beneficiation of such waste manganiferous ores has solved multiple resource utilization problems in the iron and steel industries. Manganiferous iron ores in the study area showed a lower response to conventional beneficiation routes. Hence, the laboratory experimental design steps comprised dry grinding to &lt; 1&#xa0;mm, reduction roasting at 800&#xa0;°C for 2&#xa0;h, followed by water quenching. Wet grinding of the reduced products to &lt; 0.1&#xa0;mm, followed by wet low-intensity magnetic separation (WLIMS). The final concentrate contained 64.8% Fe, 1.35% Mn, 4.6% acid insoluble, and 0.9% LOI, with 88.5% Fe Recovery and 71.7% yield (by weight). The final iron ore concentrate with 1.35%Mn could be used as a pellet feed because the Mn content of the iron ore concentrates enhances the drop strength of the iron pellets and reduces the induration temperature.</p>

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Beneficiation of Manganiferous Iron Ores from Sandur, Karnataka: A Novel Processing ROUTE for Pellet Feed

  • 期刊论文

  • 发表日期：

    2026年5月4日

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  • P. S. Kumar,
  • R. Bhima Rao,
  • U. M. Reddy

摘要

This study aims to develop a processing route to beneficiate manganiferrous iron ore and recover iron values for pellet-making. Studies on the separation of Mn from Fe have described the failure of gravity separation methods owing to the similar physical characteristics of Mn and Fe ores. Therefore this, the manganese-rich iron ores from the Sandur area, Karnataka, India, assayed 52.5% Fe, 5.2% Mn, 4.5% silica, 3.1% Al2O3, and 8.7% LOI and contained significant amounts of hematite, martitized magnetite, and goethite as iron ore minerals with subordinate amounts of psilomelane and pyrolusite as manganese gangue minerals and minor amounts of clay and quartz were subjected to beneficiation. The low manganese content in the iron ore concentrate acts as a good additive in iron ore pelletization to improve pellet strength. The beneficiation of such waste manganiferous ores has solved multiple resource utilization problems in the iron and steel industries. Manganiferous iron ores in the study area showed a lower response to conventional beneficiation routes. Hence, the laboratory experimental design steps comprised dry grinding to < 1 mm, reduction roasting at 800 °C for 2 h, followed by water quenching. Wet grinding of the reduced products to < 0.1 mm, followed by wet low-intensity magnetic separation (WLIMS). The final concentrate contained 64.8% Fe, 1.35% Mn, 4.6% acid insoluble, and 0.9% LOI, with 88.5% Fe Recovery and 71.7% yield (by weight). The final iron ore concentrate with 1.35%Mn could be used as a pellet feed because the Mn content of the iron ore concentrates enhances the drop strength of the iron pellets and reduces the induration temperature.