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<p>To support tungsten residue recycling <i>via</i> silicothermic reduction, this study investigates the corrosion and interfacial reactions of MgO and Al<sub>2</sub>O<sub>3</sub> crucibles with slags generated from the silicothermic reduction of tungsten leaching residues. Two industrial tungsten residues with distinct compositions were studied under static melting at 1450 °C for 1 hour. Commercial MgO crucibles, characterized by high porosity, suffered deep infiltration and severe degradation—especially under CaO-rich slag—due to deep infiltration and the formation of low-density silicate phases. In contrast, dense Al<sub>2</sub>O<sub>3</sub> crucibles maintained their integrity, exhibiting only localized interfacial reactions and moderate phase changes. Spinel, forsterite, and complex aluminates were identified as the main reaction products. Thermodynamic simulations with FactSage confirmed the temperature- and composition-dependent phase evolution. These findings highlight the critical roles of refractory microstructure and slag chemistry in high-temperature corrosion and offer practical insights for refractory selection in the recycling of tungsten residues.</p>

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High-Temperature Corrosion of MgO and Al2O3 Refractories by Slags from Silicothermic Reduction of Tungsten Leaching Residues

  • 期刊论文

  • 发表日期：

    2026年1月21日

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  • Nan Zhang,
  • Chunjia Liu,
  • Zexi Huang,
  • Liuqing Huang,
  • Mingjing Li

摘要

To support tungsten residue recycling via silicothermic reduction, this study investigates the corrosion and interfacial reactions of MgO and Al2O3 crucibles with slags generated from the silicothermic reduction of tungsten leaching residues. Two industrial tungsten residues with distinct compositions were studied under static melting at 1450 °C for 1 hour. Commercial MgO crucibles, characterized by high porosity, suffered deep infiltration and severe degradation—especially under CaO-rich slag—due to deep infiltration and the formation of low-density silicate phases. In contrast, dense Al2O3 crucibles maintained their integrity, exhibiting only localized interfacial reactions and moderate phase changes. Spinel, forsterite, and complex aluminates were identified as the main reaction products. Thermodynamic simulations with FactSage confirmed the temperature- and composition-dependent phase evolution. These findings highlight the critical roles of refractory microstructure and slag chemistry in high-temperature corrosion and offer practical insights for refractory selection in the recycling of tungsten residues.