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On March 28, 2023, the Zhongguancun Green Mine Industry Alliance organized relevant experts to report on the 2022 Green Mine Major Engineering Award (Ministry of Science and Technology Record No. 0265) project declared by Jizhong Energy Fengfeng Group Co., Ltd. and Hebei Environmental Engineering Institute - "Jizhong China Energy Fengfeng Group gangue dump rapid treatment and greening project" conducted on-site field research.
Jizhong Energy Fengfeng Group has a coal mining history of more than 100 years. As one of the country's important coal production bases, while making outstanding contributions to national energy security and modernization, it has also left piles of gangue. The existing large and small gangue piles 18, the total amount of waste dumps is about 50.774 million tons, covering an area of about 147.2hm2, of which 7 have been decommissioned, 11 are involved in the production of gangue, the production area covers an area of about 20.94hm2, and the non-production area covers an area of about 123.06 hm2. With the increase of gangue piles, not only land resources are occupied, but also the ecological and environmental problems derived from it are gradually emerging. For this reason, the ecological restoration and comprehensive management of gangue dumps are imminent, and have become a major problem that must be overcome for the development of coal mining enterprises.
The gangue dumps of this project are all located in low plain areas, and the accumulation area of gangue is limited, the slope is large, the degree of surface weathering is low, and the climate is dry and rainless, making ecological management difficult. Jizhong Energy Fengfeng Group, in the process of implementing the fast treatment and greening project of gangue dumps, has carried out scientific, reasonable, practical and harmless disposal of gangue dumps according to the characteristics of coal gangue dumps in various mines, and completed the ecological restoration of gangue dumps and governance. Taking main measures such as enclosure, watering and dust reduction, soil covering and greening, gangue power generation, gangue brick making, and gangue backfilling, etc., the treatment has achieved preliminary results; construction of dust prevention and dust reduction technology + slope stabilization technology + soil stabilization technology + vegetation establishment technology + The "five-in-one" technical system of gangue hill rapid treatment and green-covered ecological restoration of maintenance and management technology; integrates the technical model of multi-phase coupling of gangue layer-covering soil layer-vegetation layer with soil-covering and biological slope protection, The governance purpose of "one policy for one mountain, one policy for each side" has been realized.
At the same time, in view of the steep slope of the coal gangue pile, which is higher than 30°, the flexible slope cutting and graded treatment technology is adopted to carry out multi-level slope separation engineering and graded horseway construction, and a variety of drainage ditch systems are used according to different slopes, effectively It curbs water and soil loss and ensures the stability of the interface of the unstable foundation of the gangue hill. For the first time, the "high-grade clay aggregate" slope spraying greening technology was applied to gangue hills, which ensured the continuous and stable effect of bioremediation.
In recent years, the party and government leaders of Fengfeng Group have attached great importance to the construction of enterprise ecological civilization, actively practiced Xi Jinping's ecological civilization thought, and carried out large-scale governance and ecological restoration of gangue hills, which have achieved remarkable results. Through nearly three years of governance, a total investment of 107 million yuan has been made, with 1.092 million square meters of greening, 201,000 trees planted, 1.352 million cubic meters of slope cut, 253,000 cubic meters of soil covered, 16,442 meters of enclosure, 31,224 meters of ditches, and 6,136 meters of pools. Cubic meters, 1.098 million square meters of thatch, 47,610 meters of sprinkler pipelines and 1,100 sets of spray guns have been installed, achieving full green coverage of idle gangue hills and a greening rate of more than 80% of production mine gangue hills.
The waste rock hills in the past have a new look now; every step is full of green, and every step is full of scenery. Greening is planted on the stone hill, trees are planted in the slag pile, the waste rock hill that was once desolate and gray is now covered with green clothes, and it is full of vitality. A beautiful microcosm of the Group's ecological civilization construction effectiveness.
Experts who participated in the on-site investigation include: relevant leaders of the former Ministry of Land and Resources, researcher Guan Fengjun, former director of the Geological Environment Department of the Ministry of Land and Resources, Song Yongqi, secretary of the party committee and chairman of China Geological Mining Co., Ltd., professor-level senior engineer, and the Development Research Center of China Geological Survey Researcher Qi Yabin, director and deputy secretary of the party committee, and Yang Sen, director of the Industry-University-Research Collaborative Innovation Center of China Green League.