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<p>Refractory siderite ores with low iron grade and high contents of magnesium, calcium, and manganese present challenges for efficient utilization, and conventional roasting–magnetic separation often suffers from limited iron recovery and poor adaptability to complex compositions. To address these issues, an innovative reduction roasting–electromagnetic induction heating–magnetic separation (DR–EIH–MS) process was developed. The influences of reduction roasting, induction heating, and magnetic separation parameters on beneficiation performance were systematically evaluated. Under optimized conditions, a powdery reduced iron product with 90.02&#xa0;wt.% total iron, 4.05&#xa0;wt.% MgO, and 1.74&#xa0;wt.% MnO was obtained, achieving a comprehensive iron recovery above 85.42%. Compared with conventional direct reduction–magnetic separation, the DR–EIH–MS process increased iron grade by 8%–10% and recovery by 10%–15%, confirming its superior separation efficiency. Mechanism analysis using X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy revealed that induction heating promoted the migration and growth of metallic iron crystals, thereby enhancing liberation from gangue minerals and ultimately improving separation performance.</p>

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Efficient upgrading of refractory siderite ore by reduction roasting–electromagnetic induction heating–magnetic separation process

  • 期刊论文

  • 发表日期：

    2026年7月9日

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  • Gen Li,
  • Jian Pan,
  • De-Qing Zhu,
  • Zheng-Qi Guo,
  • Zhuang Yuan

摘要

Refractory siderite ores with low iron grade and high contents of magnesium, calcium, and manganese present challenges for efficient utilization, and conventional roasting–magnetic separation often suffers from limited iron recovery and poor adaptability to complex compositions. To address these issues, an innovative reduction roasting–electromagnetic induction heating–magnetic separation (DR–EIH–MS) process was developed. The influences of reduction roasting, induction heating, and magnetic separation parameters on beneficiation performance were systematically evaluated. Under optimized conditions, a powdery reduced iron product with 90.02 wt.% total iron, 4.05 wt.% MgO, and 1.74 wt.% MnO was obtained, achieving a comprehensive iron recovery above 85.42%. Compared with conventional direct reduction–magnetic separation, the DR–EIH–MS process increased iron grade by 8%–10% and recovery by 10%–15%, confirming its superior separation efficiency. Mechanism analysis using X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy revealed that induction heating promoted the migration and growth of metallic iron crystals, thereby enhancing liberation from gangue minerals and ultimately improving separation performance.