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The high ash content of coal is the main reason limiting its high-value utilization. The ultra-clean coalUltra-clean coal can be used as precursors for hard carbon materials, activated carbon, and carbon molecular sieves. The current methods of coal deashing are mainly physical or chemical. Bituminous coal is a commonly used precursor for carbon-based materialsCarbon-based material, of which the main component of ash is silica. In this study, a physicochemical method was used for deep deashingChemical deashing of bituminous coal to prepare ultra-clean coalUltra-clean coal. Quartz and other minerals in the coal were removed by flotation pretreatment. The coal was then deeply deashed by NaOH-HCl leaching. Residual minerals reacted with NaOH to generate water-soluble sodium silicate and sodium silicoaluminates that were soluble in acid and removed. The results indicated that ultra-clean coal with a content of 0.9% can be obtained through the flotation processFlotation process and subsequent alkali-acid leaching.

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Deep Deashing of Bituminous Coal to Prepare Ultra-Clean Coal by Physicochemical Approach

  • 会议论文

  • 发表日期：

    2025年

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  • Chenxi Xie,
  • Kun Lin,
  • Zijian Su,
  • Guang Yang,
  • Yuanbo Zhang

摘要

The high ash content of coal is the main reason limiting its high-value utilization. The ultra-clean coalUltra-clean coal can be used as precursors for hard carbon materials, activated carbon, and carbon molecular sieves. The current methods of coal deashing are mainly physical or chemical. Bituminous coal is a commonly used precursor for carbon-based materialsCarbon-based material, of which the main component of ash is silica. In this study, a physicochemical method was used for deep deashingChemical deashing of bituminous coal to prepare ultra-clean coalUltra-clean coal. Quartz and other minerals in the coal were removed by flotation pretreatment. The coal was then deeply deashed by NaOH-HCl leaching. Residual minerals reacted with NaOH to generate water-soluble sodium silicate and sodium silicoaluminates that were soluble in acid and removed. The results indicated that ultra-clean coal with a content of 0.9% can be obtained through the flotation processFlotation process and subsequent alkali-acid leaching.