Occurrence Relationship between Sodium and Maceral Groups in Subbituminous Coal: A Case Study on Zhundong Coal and Shenfu Coal

The occurrence characteristics of sodium and its potential relationship with macerals in Zhundong coal, as well Shenfu coal average levels, are investigated this study. A new five-step sequential extraction method was first conducted for determination. status related samples determined by microscope SEM–EDS (scanning electron microscope–energy dispersive X-ray spectroscopy). Soluble salts (H2O-Na) make up the primary proportion at approximately 50%, while various species distributed nonobvious differences. Inertinite contains more than vitrinite does both coals, highest enrichment degree discovered inertinite from which presented primarily NaCl crystals fusinite cells, a local weight percentage over 15%. More specifically, H2O-Na insoluble Na tend to enrich fusinite. Additionally, it is found that maceral-rich products can be gathered using triboelectrostatic separation, portion thus removed removing inertinite. This study may provide insights references regarding removal coal.