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Several materials such as CaO, Mg(OH)2, Ca3(PO4)2, sepiolite, CaCO3 were used to stabilize radioactive monazite waste residue. Different dosing ratios and long-term leaching experiments were carried out, the changes in U, Th, and pH were monitored, and the stabilization mechanism of U and Th was revealed by means of XRD, SEM-EDS, and variation of the distribution and forms. The results show that under the condition of 5.0% and 7.5% dosage ratio, the leaching solution of all experimental groups meet the standard requirements of pH=6~9. In subsequent long-term leaching experiments, only Ca3(PO4)2 has the long-term stability ability for U and Th nuclides. In the short term, the increase in pH of waste residue has a stabilizing effect on U, and the activation and redissolution of U after stabilization is a long-term process unrelated to acid reflux. The stability of Th is mainly affected by pH, pH>6 can achieve long-term stability of Th. During the stabilization process, the surface of the waste residue become rough due to the formation of precipitation, and the precipitated U and Th secondary phases are mostly amorphous. The stabilization of U and Th nuclides is mainly related to promoting the transition of exchangeable state and carbonate complex state to iron-manganese oxidation state and residual state.
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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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