Study on coal quality characteristics and comprehensive utilization of main mining seams in Guishan coal mine, Yunnan province

It is of great significance to study the distribution characteristics of coal quality and associated minerals for improving the comprehensive utilization level of coal resources and the construction of clean energy.Based on the sample test data, this paper analyzes and studies the coal quality characteristics, main useful elements, harmful elements and CBM occurrence of recoverable coal seams in Guishan coal mine.The research results show that the main minable coal seams in Guishan coal mine are extra low moisture, medium ash, medium volatile and medium sulfur coking coal (JM24 and JM25), which are relatively high-quality coking coal or blending coal.The sulfur composition of coal seam is mainly pyrite sulfur, with less organic sulfur; the ash composition is mainly acid oxides, with small ash composition index, indicating that the coal forming environment is a weak reduction type close to the terrigenous area.Ga and In elements in coal seams are relatively enriched, Ga content is 4.70-7.11 times of the average Ga content in China's coal mines, and 5.31-8.03 times of the average Ga content in the world's coal mines; In content is 3.80-4.60 times of the average In content in China's coal mines, and 6.33-7.67 times of the average In content in the world's coal mines, which has potential value for the development of high element coal seams.CBM resource is about 2.1 billion m³, which is a small gas reservoir with comprehensive utilization value.However, the harmful elements such as phosphorus(PD) and chlorine(CLD) are relatively enriched in the coal seam.Therefore, attention should be paid to the early washing and later discharge recovery of harmful elements in the mining process.