“变废为宝”，把煤基固废玩出新花样

Core Viewpoint - The coal-based solid waste, including coal gangue, fly ash, and gasification slag, poses significant environmental challenges due to its difficult disposal and low utilization efficiency, leading to land occupation and potential pollution risks. The industry is under pressure to enhance the comprehensive utilization rate of these wastes to 60% by 2025 as per government guidelines [1]. Group 1: Industry Challenges and Policy Requirements - The coal industry faces a critical issue with the disposal of coal-based solid waste, which is difficult to manage and has low utilization efficiency, leading to environmental concerns [1]. - The "14th Five-Year Plan" mandates a significant increase in the comprehensive utilization capacity of coal-based solid waste by 2025, aiming for a 60% utilization rate and a reduction in existing waste [1]. Group 2: Technological Innovations and Solutions - The company has developed a "coal gangue + modified gasification slag + fly ash" paste material for underground disposal, successfully applied in various mining scenarios, achieving an annual disposal capacity of 1 million tons of coal gangue [2]. - Innovative technologies such as suspended calcination and high-temperature balling have been developed to convert coal-based solid waste into high-value chemical products, including metakaolin and silica fume [3][4]. - The establishment of a particle size distribution model for kaolinite has enabled the separation of high-alumina coal gangue into different raw materials, laying the groundwork for high-value utilization [5]. Group 3: Environmental and Economic Impact - The company is exploring the use of coal-based solid waste in ecological restoration and resource supplementation, creating a "full-chain recycling" model [6]. - Microbial technology is being utilized to activate nutrients in coal gangue for soil improvement, contributing to a sustainable ecosystem and enhancing economic benefits in mining areas [8]. - The approach of "quality classification and tiered utilization" transforms coal-based solid waste from an environmental burden into an economic resource, aligning with the dual carbon goals and promoting the upgrade of the coal industry [8].