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Lead leaching residue of acid mud contains a large number of complex and scattered precious metals, which has high recovery value. The leaching of selenium, bismuth, copper and mercury from lead leaching residue using a mixture of hydrochloric acid and sulfuric acid as the leaching agent and sodium chlorate as the oxidizing agent was studied. The effects of temperature, dosage of sodium chlorate, leaching time, liquid volume to solid mass ratio and hydrochloric acid concentration on the leaching rates of selenium, bismuth, copper and mercury were investigated. The results show that under the conditions of temperature of 40 ℃, dosage of sodium chlorate as 40% of raw material mass, leaching time of 1 h, liquid volume to solid mass ratio of 4 mL/1 g, hydrochloric acid concentration of 1 mol/L and sulfuric acid concentration of 1.5 mol/L, the leaching rates of selenium, bismuth, copper and mercury are 98.78%, 98.13%, 99.38% and 99.42%, respectively. The method can achieve high efficiency leaching of selenium, bismuth, copper and mercury, and enrich the tin, lead and silver in the residue.
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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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