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<p>Iron ore tailings (IOTs) represent a typical solid waste product of iron ore processing and are generally stockpiled in tailings dams. This study focuses on the purification of SiO<sub>2</sub> from IOTs using a superconducting high-gradient magnetic separation (S-HGMS) coupled fluorine-free acid-leaching process, effectively achieving the high-value utilization of IOTs. In small-scale S-HGMS experiments, under the conditions of a magnetic flow ratio of 0.085&#xa0;T&#xa0;s/m, the slurry concentration of 40&#xa0;g/L, and slurry flow rate of 400&#xa0;mL/min, the SiO<sub>2</sub> grade reached 96.88%, and the recovery was 40.42%. In the leaching experiments, under the conditions of HCl concentration of 4&#xa0;mol/L, H<sub>2</sub>SO<sub>4</sub> concentration of 3&#xa0;mol/L, liquid–solid ratio of 6, leaching temperature of 80°C, and a leaching time of 8&#xa0;h, a total removal rate of metal impurities was 87.69%, and the SiO<sub>2</sub> grade was 99.48%. In the pilot S-HGMS experiments, under the conditions of a magnetic flow ratio of 0.085&#xa0;T&#xa0;s/m, the slurry concentration of 1%, and slurry flow rate of 2500&#xa0;mL/min, the grade reached 96.35%, and the recovery was 46.88%. The process can effectively recover valuable components from IOTs and utilize them in a high-value-added manner while reducing secondary pollution emissions.</p>

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Study on Purification of SiO2 by S-HGMS Coupling Technology with Fluorine-Free from Iron Ore Tailings and Mechanism

  • 期刊论文

  • 发表日期：

    2025年2月10日

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  • Xuebao Tang,
  • Suqin Li,
  • Cong Li,
  • Yongkui Li,
  • Shuai Li

摘要

Iron ore tailings (IOTs) represent a typical solid waste product of iron ore processing and are generally stockpiled in tailings dams. This study focuses on the purification of SiO2 from IOTs using a superconducting high-gradient magnetic separation (S-HGMS) coupled fluorine-free acid-leaching process, effectively achieving the high-value utilization of IOTs. In small-scale S-HGMS experiments, under the conditions of a magnetic flow ratio of 0.085 T s/m, the slurry concentration of 40 g/L, and slurry flow rate of 400 mL/min, the SiO2 grade reached 96.88%, and the recovery was 40.42%. In the leaching experiments, under the conditions of HCl concentration of 4 mol/L, H2SO4 concentration of 3 mol/L, liquid–solid ratio of 6, leaching temperature of 80°C, and a leaching time of 8 h, a total removal rate of metal impurities was 87.69%, and the SiO2 grade was 99.48%. In the pilot S-HGMS experiments, under the conditions of a magnetic flow ratio of 0.085 T s/m, the slurry concentration of 1%, and slurry flow rate of 2500 mL/min, the grade reached 96.35%, and the recovery was 46.88%. The process can effectively recover valuable components from IOTs and utilize them in a high-value-added manner while reducing secondary pollution emissions.