Progress on Resource Application of Coal Gangue and Soil Reconstruction Technology of Coal Gangue Slag Hill
The coal mining process will be accompanied with the production of coal gangue as a solid waste.A large number of coal gangue discharged is piled up in the open areas to form coal gangue slag hills,which not only occu-py lots of land,but also destroy the local ecosystem,causing the irreversible harm,such as the serious degradation of the soil and ruination of vegetation and so on.The reclamation utilization rate of coal gangue in my country is significantly lower than the output rate.Additionally,the current restoration technology of coal gangue slag mountains primarily relies on soil reconstruction technologies,which are extensively employed in low-altitude min-ing areas,but are extremely challenging regarding the high-cold and high-altitude mining areas in ecologically frag-ile state.In this paper,the physicochemical properties and existing application techniques of coal gangue are intro-duced.The differences between soil reconstruction technologies of coal gangue slag mountains at home and abroad are compared.The application of soil reconstruction technologies based on topsoil backfill,guest soil mulching and artificial soil in low-altitude mining zones are discussed in detail,as well as the current soil reconstruction methods in high-altitude mining areas represented by Muli coalfield in Qinghai.Meanwhile,the paper points out the shorta-ges of existing utilization technology with coal gangue and the issues of soil reconstruction approaches.The opportu-nities and challenges of soil reconstruction in high-altitude mining regions are prospected.The recycling utilization of coal gangue should be focused on achieving its high added value.Soil reconstruction technology should essentially take advantage of the virtue of high organic matter in coal gangue,and there is an urgent need to improve the cost,safety,and sustainability of this technology in order to promote its development in the resource application of coal gangue and the restoration of coal gangue slag piles.
coal gangueresource utilizationrestoration of slag mountainsoil reconstruction
国家科技期刊平台
NSTL
万方数据
维普
