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During the 2023 shutdown/excavation/rebuild works at the Rio Tinto KennecottRio Tinto Kennecott copperCopper flashFlash smelterSmelter, worn magnesia-chromia-type refractoryRefractories bricks and copperCopper metalMetal/speissSpeiss/matteMatte buildups were removed and analyzed to evaluate the mechanism of refractoryRefractories penetration and wear. Microstructural and phase characterization was performed using scanning electron microscopy-based techniques, and the results were interpreted based on the predicted phase-equilibria between the chemical constituents of the samples. Based on the analysesAnalysis, the oxidation of the infiltrating hot matteMatte/metalMetal was found to increase its arsenicArsenic concentration—leading to the formationFormation of speissSpeiss. Subsequent oxidation of the speissSpeiss in the presence of magnesia resulted in the formationFormation of magnesium arsenates and chemical degradationDegradation of the original refractory materialRefractory material.

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Post-mortem Investigation of Magnesia-Chromium Brick Corrosion by Speiss in a Copper Smelting Furnace: Key Findings

  • 会议论文

  • 发表日期：

    2025年

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  • X. Wen,
  • M. Shevchenko,
  • D. Gregurek,
  • J. Schmidl,
  • L. Konrad,
  • R. Walton,
  • E. Jak

摘要

During the 2023 shutdown/excavation/rebuild works at the Rio Tinto KennecottRio Tinto Kennecott copperCopper flashFlash smelterSmelter, worn magnesia-chromia-type refractoryRefractories bricks and copperCopper metalMetal/speissSpeiss/matteMatte buildups were removed and analyzed to evaluate the mechanism of refractoryRefractories penetration and wear. Microstructural and phase characterization was performed using scanning electron microscopy-based techniques, and the results were interpreted based on the predicted phase-equilibria between the chemical constituents of the samples. Based on the analysesAnalysis, the oxidation of the infiltrating hot matteMatte/metalMetal was found to increase its arsenicArsenic concentration—leading to the formationFormation of speissSpeiss. Subsequent oxidation of the speissSpeiss in the presence of magnesia resulted in the formationFormation of magnesium arsenates and chemical degradationDegradation of the original refractory materialRefractory material.