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In order to recycle the waste circuit boards, the acid leachate with a copper content of 34.33 g/L was treated by adopting solvent extraction to recover the copper therein. The effects of extractant type, extraction time, phase ratio, extractant concentration, and extraction temperature on copper extraction efficiency were all investigated. The results show that with AD100 as the copper extractant, phase ratio (VO/VA) at 1∶3, and extractant concentration of 60%, an oscillating extraction at room temperature of 25 ℃ for 10 min can result in the copper extraction rate of 96.62%. Then, a back-extraction process is adopted to treat the organic phase with oxalic acid, producing copper oxalate, which can be calcined to obtained copper oxide products.
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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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