PDF
Full
Outline
To address issues of high cost of traditional cement-based filling materials and poor bonding of ultra-fine tailings as a component, a solid-waste-based cementitious material was developed for the backfill of a molybdenum mine in Shaanxi Province. Steel slag, slag, and desulfurization gypsum were used as main raw materials, formulated with a performance modifier. The formulation of the solid-waste-based cementitious material was studied by varying the content and fineness of slag powder. The optimal formulation was selected to investigate application performance of backfill bodies and micromorphology of hydration products of the cementitious material. Results showed that the optimal formula of the solid-waste-based cementitious filling material was 60% slag powder (407 m2/kg), 20% steel slag powder, 20% desulfurization gypsum, and 0.6% performance regulator. Under this ratio, compressive strength of backfill bodies at all curing ages was superior to that of P·O 42.5 cement, with 28-day compressive strength reaching up to twice that of the cement group. Moreover, when cement-sand ratios were 1∶7, 1∶15, and 1∶16, respectively, strength requirements of different backfill zones were satisfied. Meanwhile, the material exhibited excellent fluidity and volume stability. Leaching toxicity indexes of all backfill bodies were lower than the limits specified in GB 8978—1996, indicating favorable environmental safety. Main hydration products were acicular-rod ettringite and fibrous gel-like C-S-H gel, which were interwoven to form a dense structure. The solid-waste-based cementitious filling material developed in this study had potentials of realizing resource utilization of solid waste and reducing backfill costs, providing technical support for green and efficient backfill of mines.
PDF
36
9
| 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 |
关闭全屏
No. 86 Xueyuan South Road, Haidian District, Beijing
010-62199257
qkjq@cast.org.cn
Copyright © 2025 China Association for Science and Technology. All rights reserved. For all open access content, the relevant licensing terms apply.
Sponsored by the Office of the Leading Group for Cybersecurity and Informatization of CAST, and supported by Science and Technology Review Publishing House
