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Outline
For zinc acid leaching residue, the reduction leaching of zinc, iron and copper and the enrichment of lead and silver were studied by using zinc concentrate as the reducing agent and zinc smelting waste electrolyte as the leaching agent under micro-pressure conditions. The micro-pressure reduction leaching residue was then leached with hot acid. The effects of various factors on the two-stage leaching were investigated. The results show that the optimal conditions for micro-pressure reduction leaching are pressure of 0.2 MPa, final acid concentration of 35 g/L, reaction temperature of 100 ℃, liquid volume to solid mass ratio of 8/1, zinc concentrate addition of 1.1 times the theoretical amount, stirring speed of 400 r/min, and reaction time of 2 h. The micro-pressure reduction leaching residue obtained under these conditions was leached with hot acid at 90 ℃ and a final acid concentration of 110 g/L for 2 h. The total leaching rates of zinc, iron and copper after the two-stage leaching can reach 95.81%, 92.67% and 92.63%, respectively, and the residue rate is 24.61% of the zinc acid leaching residue, which can achieve the reduction of the residue. Lead and silver are enriched in the hot acid leaching residue, with a sulfur mass fraction of 23.42%. The leaching residue has a high content of valuable metals and strong potential for self-heating. The method utilizes the reducing property of zinc concentrate and the oxidizing property of Fe3+ in the zinc acid leaching residue leaching solution to achieve efficient and comprehensive recovery of zinc acid leaching residue, and has certain application and promotion value.
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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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