Full
Outline
Large quantities of coal gasification slag are generated during the exploitation and utilization of coal resources, and the efficient and green disposal of this slag is one of the key issues that urgently needs to be resolved in the coal sector. Through an orthogonal experimental system, the working and mechanical properties of coal gasification slag paste filling materials were systematically studied, and their compliance with current standard specifications was compared. Using range analysis, the optimal mix proportion was determined as follows: a slag-to-gypsum ratio of 2.5∶1.5, a fly ash blending ratio of 2∶2, a slurry mass concentration of 76%, and a corresponding coal gasification slag content of 11.7%. The static leaching method was adopted to conduct immersion tests on this material, and the water quality indicators of the leachate at different immersion ages were examined. The results show that the indicators of the leachate stabilize in the later stage, comply with the Class III groundwater quality standard, and meet the basic requirements for groundwater quality. The F-value method was employed for a comprehensive water quality assessment. The results indicate that the groundwater quality grade for different immersion durations is predominantly "Good". Although the water quality declines slightly with prolonged immersion time, it remains in a safe state overall. Compared with traditional paste filling materials, the cost of the coal gasification slag paste filling material is reduced by 16%, and the comprehensive performance is significantly enhanced. This provides an important basis for the engineering application of coal gasification slag paste filling technology and holds great significance for realizing the resource utilization of coal-based solid waste and the protection of groundwater quality.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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