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<p>The rapid detection of heavy metal elements in coal is crucial for environmental pollution assessment. X-ray fluorescence (XRF) analysis proves particularly advantageous as it eliminates the need for complex pretreatment processes. However, its detection accuracy is fundamentally constrained by the surface roughness of pressed pellets. This study systematically investigates the effects of pressing pressure, holding time, and coal powder quantity on surface roughness while employing response surface methodology to elucidate the interaction effects among these parameters. Experimental results show that pulverized coal pretreatment significantly reduces surface roughness; a threshold effect exists for pressing pressure, with roughness increasing beyond 15&#xa0;MPa; synergistic control of holding time and powder quantity effectively regulates the minimum thickness limit of pressed pellets. The response surface model reveals that pressure-powder quantity interaction constitutes the most significant factor. Under optimized conditions (15&#xa0;MPa pressure, 80&#xa0;s duration, 5&#xa0;g sample mass), surface roughness (Ra) was minimized to 0.0232&#xa0;μm. This research establishes a high-precision sampling protocol for coal XRF analysis and provides theoretical guidance for parameter optimization in powder material compaction processes.</p>

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Research on the Mechanism of Multi-factor Coupling Effect on Surface Roughness of Pulverized Coal Briquettes

  • 期刊论文

  • 发表日期：

    2025年9月9日

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  • Ning Han,
  • Jiahao Fang,
  • Yanfeng Li

摘要

The rapid detection of heavy metal elements in coal is crucial for environmental pollution assessment. X-ray fluorescence (XRF) analysis proves particularly advantageous as it eliminates the need for complex pretreatment processes. However, its detection accuracy is fundamentally constrained by the surface roughness of pressed pellets. This study systematically investigates the effects of pressing pressure, holding time, and coal powder quantity on surface roughness while employing response surface methodology to elucidate the interaction effects among these parameters. Experimental results show that pulverized coal pretreatment significantly reduces surface roughness; a threshold effect exists for pressing pressure, with roughness increasing beyond 15 MPa; synergistic control of holding time and powder quantity effectively regulates the minimum thickness limit of pressed pellets. The response surface model reveals that pressure-powder quantity interaction constitutes the most significant factor. Under optimized conditions (15 MPa pressure, 80 s duration, 5 g sample mass), surface roughness (Ra) was minimized to 0.0232 μm. This research establishes a high-precision sampling protocol for coal XRF analysis and provides theoretical guidance for parameter optimization in powder material compaction processes.