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The aim of this study is to evaluate the effect of slagSlag infiltrationInfiltration on the thermal properties of magnesia-chromite refractoriesRefractories. The samples studied in this work were obtained from a precious metalsPrecious metals top-blown rotary converter. The bricks were collected from three locations inside the furnaceFurnace. The structure, slagSlag infiltrationInfiltration, and porosity of the bricks were studied using X-ray computed tomography (XCT), after which the thermal diffusivities of slagSlag-infiltrated and as-delivered MgO–Cr2O3 refractoryRefractories bricks were measured using laser flashFlash analysisAnalysis (LFA). The diffusivities were obtained as a function of temperature, from 20 to 700 °C. After LFA, the sample microstructuresMicrostructure were analyzed with scanning electron microscope-energy dispersive X-ray spectrometer to investigate changes in the microstructureMicrostructure and degradationDegradation of the bricks. Changes in thermal diffusivity were evaluated in relation to structural changes and degradationDegradation. XCT imaging showed that the brick samples from the bottom and cylinder contained notable amounts of infiltrated slagSlag throughout their length, but the slagSlag infiltrated to a lesser extent in the cone. The porosity of the samples decreased significantly after slagSlag interaction, and the structure was densified towards the hot face. Changes in the microstructureMicrostructure occurred through chemical dissolutionDissolution, slagSlag penetration, and hot erosion. The MgO was corroded by the reaction between MgO and SiO2 in the slagSlag, consequently forming a new phase, forsterite. The slagSlag infiltrationInfiltration causes changes in the thermal diffusivities in comparison to an unused refractoryRefractories. These changes, however, are rather slight. The highest increase in diffusivities was observed in samples near the cold face, but the differences in the slagSlag volume at that penetration depth showed a surprisingly small impact on the diffusivity.

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Thermal Properties of Magnesia-Chromite Refractories in a Precious Metals Top-Blown Rotary Converter

  • 会议论文

  • 发表日期：

    2025年

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  • Lotta Kleemola,
  • Lassi Klemettinen,
  • Jukka Kuva,
  • Daniel Lindberg

摘要

The aim of this study is to evaluate the effect of slagSlag infiltrationInfiltration on the thermal properties of magnesia-chromite refractoriesRefractories. The samples studied in this work were obtained from a precious metalsPrecious metals top-blown rotary converter. The bricks were collected from three locations inside the furnaceFurnace. The structure, slagSlag infiltrationInfiltration, and porosity of the bricks were studied using X-ray computed tomography (XCT), after which the thermal diffusivities of slagSlag-infiltrated and as-delivered MgO–Cr2O3 refractoryRefractories bricks were measured using laser flashFlash analysisAnalysis (LFA). The diffusivities were obtained as a function of temperature, from 20 to 700 °C. After LFA, the sample microstructuresMicrostructure were analyzed with scanning electron microscope-energy dispersive X-ray spectrometer to investigate changes in the microstructureMicrostructure and degradationDegradation of the bricks. Changes in thermal diffusivity were evaluated in relation to structural changes and degradationDegradation. XCT imaging showed that the brick samples from the bottom and cylinder contained notable amounts of infiltrated slagSlag throughout their length, but the slagSlag infiltrated to a lesser extent in the cone. The porosity of the samples decreased significantly after slagSlag interaction, and the structure was densified towards the hot face. Changes in the microstructureMicrostructure occurred through chemical dissolutionDissolution, slagSlag penetration, and hot erosion. The MgO was corroded by the reaction between MgO and SiO2 in the slagSlag, consequently forming a new phase, forsterite. The slagSlag infiltrationInfiltration causes changes in the thermal diffusivities in comparison to an unused refractoryRefractories. These changes, however, are rather slight. The highest increase in diffusivities was observed in samples near the cold face, but the differences in the slagSlag volume at that penetration depth showed a surprisingly small impact on the diffusivity.