Impact of large sized inertinite particles on thermo-swelling and volatile release of coking coals

Wei Xie, Rohan Stanger, Quang Anh Tran, Merrick Mahoney, John Lucas, Jianglong Yu, Terry Wall

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5 Citations (Scopus)


A reflux classifier system was employed to concentrate large sized inertinite-rich particles (1.6–2.0 mm)from two different ranked coking coals A and B. The impact of these concentrates on swelling, permeability and volatile evolution rates of another two coking coals C and D was investigated using the Computer Aided Thermal Analysis (CATA)and Dynamic Elemental Thermal Analysis (DETA)techniques. The results indicated that the concentrated inertinite-rich particles contained inertinite up to 75% for both coals A and B. When 25% inertinite particles were blended with 75% coal C or D by mass, the low rank inertinite concentrates A caused higher extents of effect on swelling and permeability than the high rank inertinite concentrates B, leading to higher softening temperatures with smaller plastic ranges. During swelling, inertinite concentrates B can compress volatile evolution rates of both coals C and D, however, inertinite concentrates A promoted volatile evolution rate of coal C. Concentrates from both coals A and B can compress the utilization of volatiles for driving swelling, the blend containing concentrate A used nearly half of volatiles that coals C and D themselves used for driving swelling. This study suggested that the additive internite concentrates not only provided a pathway for gas diffusion, but also interacted with the blended coals, which affected thermoplasticity of the whole blends.

Original languageEnglish
Pages (from-to)63-72
Number of pages10
JournalFuel Processing Technology
Publication statusPublished - Oct 2019
Externally publishedYes


  • Coking
  • Inertinite concentrate
  • Permeability
  • Swelling
  • Volatile release

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