Current situation and prospects of coal gangue's comprehensive utilization

LI Yadi

Abstract：Coal gangue is a solid waste generated during coal mining and washing processes.Improper disposal of coal gangue can cause serious land occupation and ecological environment damage.At present,coal gangue as the largest industrial solid waste discharged in China,has accumulated over 7 billion tons in storage and occupies about 15 000 hectares of land.Comprehensive treatment and utilization of coal gangue is urgent.In 2022,China's coal gangue production reached 808 million tons,with a comprehensive utilization of 596 million tons and a comprehensive utilization rate of 73.8％.At present,the increment of coal gangue in China is constantly increasing,and China prohibits the discharge of gangue.The comprehensive utilization rate of coal gangue is still low,and the multi component cascade utilization model has not been established.The scale and capacity of harmless disposal and comprehensive utilization of coal gangue clearly cannot meet the relevant requirements of the country for ecological environment protection and comprehensive utilization of coal under the goal of carbon peak and carbon neutral.In order to improve the comprehensive utilization rate of coal gangue and promote the development process of large-scale harmless disposal and utilization of coal gangue,this article systematically introduces the current situation and main problems in the comprehensive utilization of coal gangue in China from the aspects of coal gangue power generation,production of building materials,underground filling,high value-added utilization,and ground backfilling and land reclamation.It also analyzes the development direction of coal gangue utilization from the perspectives of national policy encouragement and preferential subsidies.Finally,the future industrialization development direction of coal gangue is proposed,including the construction of a multi-level coal gangue comprehensive utilization industry chain,the introduction of supervision measures for the entire process of coal gangue utilization,improving the standard system for comprehensive utilization of coal gangue,promoting research and demonstration of comprehensive utilization technology of coal gangue,and carrying out comprehensive utilization of coal gangue and high standard ecological construction projects.