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To investigate the synergistic mechanism of uranium tailings reinforced by sodium silicate synergized with Sporosarcina pasteurii, a uranium tailings was taken as the research object. By measuring the OD value and pH of Sporosarcina pasteurii in the environment containing sodium silicate, the effects of sodium silicate solutions with different modulus and different mass fraction on the growth law of Sporosarcina pasteurii were analyzed. Based on the microbial induced carbonate precipitation (MICP) technology, the experiment of uranium tailings column reinforced by sodium silicate synergized with Sporosarcina pasteurii was carried out, and the unconfined uniaxial compressive strength of uranium tailings columns in each group was compared and analyzed. The results show that sodium silicate with an appropriate mass fraction and modulus can significantly improve the unconfined uniaxial compressive strength of uranium tailings columns. The effect of sodium silicate solution with a modulus of 2.3 and a mass fraction of 5% is the best, and the corresponding unconfined uniaxial compressive strength of the uranium tailings column reaches 284 Pa, which is 11.8% higher than that of the single Sporosarcina pasteurii reinforcement group of 254 Pa. The results of X-ray diffraction ( XRD ) show that the precipitates formed in all experimental groups are mainly calcium carbonate crystals. Compared with the single Sporosarcina pasteurii control group, the calcite crystals formed therein have a higher proportion and better crystallization thermodynamic stability. Scanning electron microscopy (SEM) images combined with energy dispersive spectroscopy (EDS) results further confirm that after the addition of sodium silicate solution, more calcium carbonate crystals are formed, the crystal surface are smoother and flatter, and the structure is more compact. The research results provide theoretical guidance for improving the reinforcement technology of uranium tailings reservoir.
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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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