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The efficient removal and stabilization of arsenic in copper smelting waste acid is a difficult problem for the green development of the industry. Although the existing lime-iron salt method can remove arsenic, it produces a large amount of arsenic-containing waste residue, which has the risk of secondary pollution. In order to achieve treating waste with waste, the treatment of arsenic in waste acid by copper tailings was studied. Through the synergistic oxidation-precipitation mechanism of hydrogen peroxide, the effects of initial pH, solid mass to liquid volume ratio, reaction temperature, reaction time and hydrogen peroxide dosage on arsenic removal and arsenic stability were systematically investigated. The results show that under the optimal conditions of initial pH= 0.65, solid mass to liquid volume ratio of 1 g/8 mL, reaction temperature of 60 ℃, reaction time of 10 h, and 30% hydrogen peroxide dosage of 2.0 mL/100 mL, the removal rate of arsenic in waste acid reaches more than 97%, and the arsenic leaching concentration of arsenic-containing tailings after treatment reaches the standard. The method can realize the efficient removal and solidification of arsenic in waste acid, which provides a new technical support for the resource utilization of copper tailings and the treatment process of waste acid.
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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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