煤气化灰渣规模化分质梯级利用与高效处置技术研究

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 utilization 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 application 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. including the mechanisms of structural activation and synergistic regulation of aluminosilicates, the gasification reaction of carbon-rich CGS in high-temperature and the corresponding enhancement 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 mechanisms 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.