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The leaching of arsenic with air oxidation method in an alkaline system was studied. Based on the results of thermodynamic analysis, the influence of different factors on the leaching process was investigated. The leaching residue was characterized by XRD and SEM, and the leaching kinetics was discussed. The results show that under the optimized conditions of initial NaOH concentration of 2 mol/L, leaching temperature of 60 ℃, liquid volume to solid mass ratio of 10 mL/1 g, and leaching time of 168 h, the arsenic leaching rate reaches 91.9%. The leaching rate of As is jointly controlled by diffusion and chemical reactions, with apparent activation energy of 83.41 kJ/mol. The method can achieve the purpose of arsenic removal under normal pressure in an alkaline system and has certain value for promotion and application.
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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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