煤气化渣在土壤改良中的资源化利用进展OA

As the scale of the coal chemical industry continues to expand,the annual output of coal gasification slag has exceeded 6.0×107 tons,and its environmentally friendly disposal and high-value utilization become an important issue in the field of solid waste resource utilization.Based on the dual needs of collaborative governance of coal-based solid waste and improvement of soil quality,this paper systematically sorted out the physical and chemical properties of coal gasi-fication slag,clarified its key mechanisms in soil improvement,and then focused on discussing the environmental risks and scientific challenges of multi-objective improvement technologies,in or-der to provide a theoretical basis and technical route reference for promoting the coordinated de-velopment of resource utilization of coal gasification slag and sustainable soil management.Exist-ing studies showed that relying on its characteristics such as multi-level pore structure and high specific surface area,coal gasification slag could effectively improve the physical and chemical properties of sandy soil,saline-alkali soil and acidic soil,optimize soil structure,and enhance soil water and fertilizer retention performance through the triple synergistic mechanism of physical regulation,chemical improvement and pollution control.However,existing studies had bottleneck problems such as imperfect risk assessment systems,insufficient long-term effect data,and un-clear multi-medium synergistic mechanisms.Therefore,this paper proposed research directions such as constructing risk assessment models,establishing long-term positioning observation sys-tems,developing multi-source material collaborative improvement paths,and exploring supporting pH buffering technologies for acidic soil.