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<p>To improve the enrichment and recycling of iron in iron-rich copper slag, the phase and microstructure of FeO–SiO<sub>2</sub>–CaO–MgO system in oxidizing atmosphere were studied after adding MgO and CaO to the iron-rich copper slag. Thermodynamic calculations by FactSage software show that the addition of MgO favors the formation of magnetite (Fe<sub>3</sub>O<sub>4</sub>) in the FeO–SiO<sub>2</sub>–CaO–MgO system and the formation of hematite (Fe<sub>2</sub>O<sub>3</sub>) is limited. The formed Fe<sub>3</sub>O<sub>4</sub> can exist stable above 1657K in air atmosphere. The calculations are proved by XRD patterns when Fe<sub>3</sub>O<sub>4</sub> is the only iron oxide in the oxidized system. Quantitative analysis by Mössbauer spectrum indicated that 96.29% iron was enriched in Fe<sub>3</sub>O<sub>4</sub> and MgFe<sub>2</sub>O<sub>4</sub> in the quaternary system, while Fe distributed in FeSiO<sub>3</sub> and Ca(Mg,Fe)Si<sub>2</sub>O<sub>6</sub> were 0.39% and 3.32%, respectively. The magnetite and bar-shaped wollastonite crystalized in molten slag were surrounded by augite formed in the solidification processing. The growth characteristics of magnetite were investigated to improve the enrichment of iron in the modified copper slag. Results show that iron was enriched in the flakes, scattered particles, and dendrite magnetite particles, which favors the iron-recycling from copper slag by magnetic-separation.</p>

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Phase and microstructure of FeO–SiO2–CaO–MgO system in oxidizing atmosphere

  • 期刊论文

  • 发表日期：

    2025年4月4日

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  • Yong-bo Ma,
  • Yang Chen,
  • Le Tang,
  • Si-yu Chen,
  • Xin-xin Zhang,
  • Qiang Li,
  • Li-qing Ren,
  • Yan-long Li,
  • Ling-na Liu,
  • Ping-qiang Gao

摘要

To improve the enrichment and recycling of iron in iron-rich copper slag, the phase and microstructure of FeO–SiO2–CaO–MgO system in oxidizing atmosphere were studied after adding MgO and CaO to the iron-rich copper slag. Thermodynamic calculations by FactSage software show that the addition of MgO favors the formation of magnetite (Fe3O4) in the FeO–SiO2–CaO–MgO system and the formation of hematite (Fe2O3) is limited. The formed Fe3O4 can exist stable above 1657K in air atmosphere. The calculations are proved by XRD patterns when Fe3O4 is the only iron oxide in the oxidized system. Quantitative analysis by Mössbauer spectrum indicated that 96.29% iron was enriched in Fe3O4 and MgFe2O4 in the quaternary system, while Fe distributed in FeSiO3 and Ca(Mg,Fe)Si2O6 were 0.39% and 3.32%, respectively. The magnetite and bar-shaped wollastonite crystalized in molten slag were surrounded by augite formed in the solidification processing. The growth characteristics of magnetite were investigated to improve the enrichment of iron in the modified copper slag. Results show that iron was enriched in the flakes, scattered particles, and dendrite magnetite particles, which favors the iron-recycling from copper slag by magnetic-separation.