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Outline
Taking the graded tailings backfill of the Shishudi Gold Mine as the research object, the physical and chemical properties of graded tailings and industrial solid waste were analyzed. Using slag powder, steel slag powder and F-gypsum as the main raw materials, and sodium hydroxide, sodium silicate and aluminum sulfate as composite activators, low-carbon solid waste cementitious materials were prepared. Through the mixture design model in response surface methodology, the influence of different mass ratios of components on compressive strength was analyzed, the reliability of the model was assessed, and the optimal proportion of low-carbon solid waste cementitious materials was determined as slag powder∶steel slag∶F-gypsum∶activator=70.69∶10.52∶18.79∶5. Then, XRD, SEM-EDS, and hydration heat analysis were employed to examine the phase composition, microstructure, and hydration kinetics of the low-carbon solid waste cementitious materials. The results indicate that the hydration products of the low-carbon solid waste cementitious materials primarily consist of C-S-H gel, ettringite, and calcite, with the hydration heat release rate and total heat release being reduced by over 30% compared to cement. Pilot-scale tests demonstrate that replacing cement with low-carbon solid waste cementitious materials for gold tailings backfill under the same technical specifications can save more than 50% of cementitious materials, increase tailings utilization by over 10%, reduce backfill costs by over 30%, and cut carbon emissions by 90%, achieving favorable economic and social benefits.
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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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