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<p>Mixed magneto-hematite is one of the most typical iron ores in China. The standard beneficiation process involves stage grinding, coarse and fine classification, gravity–weak magnetic–strong magnetic separation, and anionic reverse flotation. Here, to improve the sorting efficiency of this iron ore type, vibrating sample magnetometry is used to analyze the magnetization characteristics of various magnetite, hematite, and gangue minerals at different mixed ratios and grinding fineness levels. Moreover, a three-product magnetic separator is developed for sorting both magnetite and hematite. The three-product magnetic separator has a unique magnetic system structure designed to target strongly magnetic magnetite and weakly magnetic hematite respectively. The experimental results show that, when the feeding concentration is set to 50%, the cylinder rotation speed is 20&#xa0;rpm, the cylinder angle is 5°, and the unloading pipe water pressure is 0.2&#xa0;MPa, the concentrate and tailings exhibit grades of 44.63% and 10.17%, respectively, with a concentrate recovery rate of 72.14%. The separation of both magnetite and hematite particles in the three products magnetic separator is facilitated by different responses of ore particles to various forces, including magnetic force, centrifugal force, fluid traction, and other composite force fields.</p>

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Magnetization Characteristics and Magnetic Separation Behavior of Mixed Magneto-Hematite in a Three-Product Magnetic Separator

  • 期刊论文

  • 发表日期：

    2025年10月17日

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  • Xingyu Ma,
  • Gaige Yuan,
  • Zihao Li,
  • Shujuan Dai,
  • Xiaofei Guo

摘要

Mixed magneto-hematite is one of the most typical iron ores in China. The standard beneficiation process involves stage grinding, coarse and fine classification, gravity–weak magnetic–strong magnetic separation, and anionic reverse flotation. Here, to improve the sorting efficiency of this iron ore type, vibrating sample magnetometry is used to analyze the magnetization characteristics of various magnetite, hematite, and gangue minerals at different mixed ratios and grinding fineness levels. Moreover, a three-product magnetic separator is developed for sorting both magnetite and hematite. The three-product magnetic separator has a unique magnetic system structure designed to target strongly magnetic magnetite and weakly magnetic hematite respectively. The experimental results show that, when the feeding concentration is set to 50%, the cylinder rotation speed is 20 rpm, the cylinder angle is 5°, and the unloading pipe water pressure is 0.2 MPa, the concentrate and tailings exhibit grades of 44.63% and 10.17%, respectively, with a concentrate recovery rate of 72.14%. The separation of both magnetite and hematite particles in the three products magnetic separator is facilitated by different responses of ore particles to various forces, including magnetic force, centrifugal force, fluid traction, and other composite force fields.