Research on the combination model of water-soluble elements in coal from eastern Xinjiang

The high content of water-soluble sodium, chlorine and sulfate ions in Xinjiang’s high-alkali coal seriously affects the clean and efficient utilization of Xinjiang’s coal. The combination mode of water-soluble elements in high-alkali coal and the influence on coal quality has become a basic problem to be solved in the scientific understanding and evaluation of Xinjiang’s coal. We collected coal seam and commercial coal samples from Dajing, Xiheishan, Santanghu, Naomaohu and Shaerhu mining areas in eastern Xinjiang, as well as surface soil overlying on the coal seams, roof and gangue samples in different mining areas, including surface salt rock samples from some mining areas. The content of water-soluble ions in relevant samples was determined by the leaching experiment. Based on the method of coal ash composition, proportion of water-soluble ions, water-soluble ions ratio parameter and Piper trilinear diagram, the difference of the combined characteristics of water-soluble elements in coal in different mini