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<p>This study investigated the effects of mineralogical and petrographic properties of 11 coal surrounding rock samples (sandstone and siltstone) from the Zonguldak Basin on their grindability and excavability. The average grain sizes of abrasive minerals and textural strength coefficient values were determined through petrographic analysis. The Hardgrove Grindability Index (HGI) and Bond Work Index (BWI) tests were conducted to evaluate grindability and excavability, respectively. Strong correlations were established between petrographic parameters and mechanical properties. BWI showed <i>R</i><sup>2</sup> values of 0.89 and 0.51 with grain size (d) and Textural Strength Coefficient (TSC), respectively, while HGI demonstrated <i>R</i><sup>2</sup> values of 0.77 and 0.66 with the same parameters. As grain size increased from 0.07 to 0.67 mm, HGI values decreased from 112.1 to 65.0, and BWI values increased from 13.23 to 21.08 kWh/t. These findings provide the first comprehensive correlation analysis between petrographic characteristics and energy-based excavation indices for coal surrounding rocks in the Zonguldak Basin, offering valuable insights for mining operations and equipment selection.</p>

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Investigation of the effect of mineralogical and petrographic properties of coal surrounding rocks in the zonguldak basin on grindability and excavability

  • 期刊论文

  • 发表日期：

    2025年10月22日

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  • Çağrı Aldı,
  • Olgay Yaralı

摘要

This study investigated the effects of mineralogical and petrographic properties of 11 coal surrounding rock samples (sandstone and siltstone) from the Zonguldak Basin on their grindability and excavability. The average grain sizes of abrasive minerals and textural strength coefficient values were determined through petrographic analysis. The Hardgrove Grindability Index (HGI) and Bond Work Index (BWI) tests were conducted to evaluate grindability and excavability, respectively. Strong correlations were established between petrographic parameters and mechanical properties. BWI showed R2 values of 0.89 and 0.51 with grain size (d) and Textural Strength Coefficient (TSC), respectively, while HGI demonstrated R2 values of 0.77 and 0.66 with the same parameters. As grain size increased from 0.07 to 0.67 mm, HGI values decreased from 112.1 to 65.0, and BWI values increased from 13.23 to 21.08 kWh/t. These findings provide the first comprehensive correlation analysis between petrographic characteristics and energy-based excavation indices for coal surrounding rocks in the Zonguldak Basin, offering valuable insights for mining operations and equipment selection.