1 18 RESEARCH ON RESOURCE RECYCLING OF COAL-MEASURE MINING WASTE AND FORESTRY, AGRICULTURAL, AND LIVESTOCK RESIDUES Liu Jing, Yang Zihai, Wang Kexin, Kong Suli, Li Yifeng (CCTEG Tangshan Research Institute Co., Ltd., Tangshan, Hebei, 063012) (Presenting author: 18903389888@189.cn) ABSTRACT Coal gangue is a solid waste generated during the processes of coal mining and coal preparation. At present, the main treatment method is landfill, which has a significant impact on the environment. In this study, thermophilic aerobic microbial strains are selected and optimized for the rapid and complete fermentation of forestry, agricultural, and livestock residues, such as livestock manure, tree leaves, and crop straw, within 24 hours to produce organic microbial fertilizer; the organic microbial fertilizer is blended with -6 mm coal gangue and tailing coal slime according to a scientific formulation to produce efficient artificial soil. This artificial soil can be used independently as a soilless cultivation substrate. It can also be used to improve low-productivity land such as saline-alkali land, desert land, and loess land. Laboratory tests and small-scale field trials have demonstrated notable effectiveness. Innovative coal preparation technology and equipment are utilized to separate +6 mm coal gangue for underground backfilling, thereby ensuring that gangue is not lifted to the surface. This series of technologies are conducive to the reduction, large-scale reuse, and recycling of coal gangue. This approach holds significant importance for the ecological restoration of mining areas, improvement of low-productivity land, and advancement of agricultural production. KEYWORDS Coal gangue treatment; Organic microbial fertilizer; Resource utilization; Improvement of lowproductivity land The primary chemical components of coal gangue are SiO2 and Al2O3. As a mixture of carbonaceous, argillaceous, and sandy shale, coal gangue contains a small amount of carbon and a certain amount of organic matter and humic acid, along with approximately 30 trace elements, including nitrogen, phosphorus, and potassium. It accounts for 15% to 30% of raw coal production. According to surveys, China's accumulated stockpile of coal gangue exceeds 7 billion tons, with an annual addition of 500 to 700 million tons. Due to constraints in economic conditions, technological capabilities, and external factors, the utilization of coal gangue is primarily limited to applications such as collapse pit backfilling, power generation, and production of building materials. However, the disposal capacity of these applications remains insufficient. Consequently, most coal gangue continues to be stockpiled, leading to a series of issues, including land occupation and environmental pollution. With the increasingly stringent environmental
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