Quality of Coal Characteristics and Usability Evaluation of Wenquan Minefield in Yanbian County
The degree of geological investigation of the Wenquan minefield in Yanbian county can no longer satisfy the feasibility study of medium-sized mines.Therefore,it is necessary to carry out further research on the quality characteristics and process performance of the coal.The main coal-bearing stratum of Wenquan minefield is the Upper Triassic Daqiaodi formation,with a simple coal seam structure,containing a total of 7 layers of recoverable coal seams(3 layers in the whole area,4 layers locally),and the average thickness ranges 0.41 m to 0.83 m.The macroscopic components of coalstone are mainly semi-dark coal,followed by semi-light coal.Most of these coalstone occur irregularly in the form of fine to medium strips and lineaments.The microscopic components are mainly mirror group,with high content of organic materials,large variation of ash,low sulfur,low moisture,high content of volatile fraction of floating coal,and large calorific value.The flow temperature and softening temperature are mainly medium,and the compositions of the coal ash are mainly composed of SiO2,Al2O3 and Fe2O3.The reactivity of the coal to carbon dioxide has positive correlation with temperature,while the viscosity of the coal ash exhibit negative correlation with temperature.Therefore,it is concluded that the main recoverable coal seams in minefield are low to medium ash,extra low sulfur to low sulfur,medium to high to high calorific value coal.The main utilization direction could be used as high-quality coking coal blending for the production of metallurgical coke.
NETL
NSTL
万方数据
