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<p>To address the challenge of directly measuring zinc dross during the hot-dip galvanizing process, an immersion-type direct measurement method was developed based on the Coulter principle. Considering the working conditions of industrial galvanizing lines, a measurement probe, support structure, and molten zinc circulation system were designed to operate under high-temperature molten zinc environments. The direct measurement of zinc dross size and concentration in molten zinc under different temperatures and chemical composition conditions has been achieved. This study further presents quantitative data that demonstrate the distribution and evolution of zinc dross under conditions ranging from 462&#xa0;°C to 501&#xa0;°C and varying iron content (0.06 to 0.14 pct). At 462&#xa0;°C, the zinc dross concentration in the molten zinc without the addition of an iron sheet was 30.98&#xa0;k/kg. After adding the iron sheet, the concentration rapidly increased to 39.55&#xa0;k/kg. As the temperature increased, the dross concentration reached 48.67&#xa0;k/kg at 501&#xa0;°C, and further increased to 54.97&#xa0;k/kg during the cooling process, indicating that the formation of zinc dross is irreversible. These results provide a direct basis for the analysis of the forming mechanism of zinc dross and key support for the dynamic and precise control and process optimization of the hot-dip galvanizing process.</p>

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Study on the Mimic Measurement of Zinc Dross in the Hot-Dip Galvanizing Process and the Influence of Temperature on Its Formation

  • 期刊论文

  • 发表日期：

    2025年12月29日

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  • Xudong Wang,
  • Jincan Zheng,
  • Zehua Yu,
  • Xingde Zhu,
  • Xiaodong Wang

摘要

To address the challenge of directly measuring zinc dross during the hot-dip galvanizing process, an immersion-type direct measurement method was developed based on the Coulter principle. Considering the working conditions of industrial galvanizing lines, a measurement probe, support structure, and molten zinc circulation system were designed to operate under high-temperature molten zinc environments. The direct measurement of zinc dross size and concentration in molten zinc under different temperatures and chemical composition conditions has been achieved. This study further presents quantitative data that demonstrate the distribution and evolution of zinc dross under conditions ranging from 462 °C to 501 °C and varying iron content (0.06 to 0.14 pct). At 462 °C, the zinc dross concentration in the molten zinc without the addition of an iron sheet was 30.98 k/kg. After adding the iron sheet, the concentration rapidly increased to 39.55 k/kg. As the temperature increased, the dross concentration reached 48.67 k/kg at 501 °C, and further increased to 54.97 k/kg during the cooling process, indicating that the formation of zinc dross is irreversible. These results provide a direct basis for the analysis of the forming mechanism of zinc dross and key support for the dynamic and precise control and process optimization of the hot-dip galvanizing process.