Research on the technology for large-scale and hierarchical utilization of coal gasification slag
ZHANG Jixiong
GU Xiaowei
ZHOU Nan
YU Guangsuo
HAO Nanjing
XIAO Yaomeng
Abstract：The large-scale utilization and disposal of coal gasification slag(CGS)constitute ma-jor challenges for China's coal chemical industry,which significantly restrains the coordinated development of coal gasification technology and environmental protection.Existing CGS utili-zation technologies,including cyclic co-combustion,value-added applications,and construction material conversion,face issues such as high costs and limited implementation scale.Current backfill technologies primarily handle coal gangue and fly ash,with limited practical applica-tion specifically for CGS-based backfill materials.This paper reviews the current utilization status and existing challenges,while breaking through the technical bottlenecks in its large-scale application and disposal.Besides,the concept and key technical issues associated with the hierarchical and differentiated large-scale utilization of CGS are systematically addressed,in-cluding the mechanisms of structural activation and synergistic regulation of aluminosilicates,the gasification reaction of carbon-rich CGS in high-temperature and the corresponding en-hancement mechanisms,the multi-dynamic activation and hydration mechanisms of low-carbon CGS,and spatiotemporal evolution of the mined-out space as well as the controlling mecha-nisms of strata movement with backfilling body subjected to Multiphysics loading.Moreover,this study also analyzes the key challenges in the development of self-sustained decarbonization and aluminosilicate pre-enrichment of CGS,micro-chemical fabrication of high-value materials,non-auxiliary fuel atmospheric pressure gasification of carbon-rich CGS,environment-friendly production of cementitious materials with low-carbon CGS,and fully integrated green intelli-gent backfilling with coal-based solid wastes.The study innovates CGS utilization technology,enhances the technical framework for comprehensive utilization and disposal of CGS,and pio-neers a new direction for resource recovery of solid waste in China's coal chemical industry.It holds broad application prospects and contributes to the recycling of CGS,which will foster the green development of the coal chemical industry.
Keywords：coal gasification slaghierarchical utilizationdifferentiated activationsolid waste disposal
Publication Date：2025-05-30
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：14( 471-484 )