Full
Outline
To address the problems of weak research on solidification and slurry properties of classified overflow fine tailings and slow progress in underground backfill treatment of fine tailings, a small spread cylinder was used to measure the spread value to determine the paste backfill concentration. Using slag-based cementitious materials, solidification tests and slurry property studies were carried out on ultrafine tailings from middling overflow of an iron mine, classified overflow fine tailings from some gold mines, and unclassified tailings from several iron mines. The results show that the use of slag-based cementitious powder can effectively solve the problems related to the solidification and strength requirements of classified overflow ultrafine tailings. Ultrafine tailings have high porosity and low bulk density, and the slurry mass concentration can be as low as below 50%. Under the same binder dosage, the cement-tailing ratio of ultrafine tailings is relatively high, but the 28-day strength loss of the backfill is limited, and the increase in backfill cost is not significant. The slurry mass concentration has a significant effect on solidification strength. Under a filling line of 3.5 to 4.0, the ultrafine tailings backfill slurry can achieve gravity flow transportation without pumping.
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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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