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Using lactic acid solution as the leaching agent, selective leaching of zinc from metallurgical dust collected from a steel plant in Shanxi was investigated. The effects of leaching time, leaching temperature, liquid volume to solid mass ratio and lactic acid concentration on the leaching effect were investigated, and the leaching mechanism was explored. The results show that under the optimal leaching conditions of lactic acid concentration of 3%, leaching temperature of 20 ℃, leaching time of 5 min, and liquid volume to solid mass ratio of 10 mL/1 g, the leaching rates of zinc and iron are 91.56% and 4.69%, respectively, achieving selective leaching of zinc. In the leaching solution, zinc primarily exist in the forms of Zn［CH3CH(OH)COO］+ and Zn2+, while in the leach residue, zinc is mainly present as zinc ferrite. The weak acidic environment of the leaching system can effectively suppress the dissolution of iron.
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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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