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Decommissioned crystalline silicon photovoltaic solar cells are rich in valuable resources and have recovery value. Increasing the separation efficiency of valuable components and metallurgy, and improving the multi-group decomposition effect of the bonding system are the key to achieve efficient resource recovery. EVA (ethylene-vinyl acetate) bonding behavior was weakened by roasting modification, and multi-component selective crushing characteristics of crystalline silicon photovoltaic solar cells were strengthened. Material distribution, EVA bonding weakening behavior and dissociation effect were analyzed by XRD, TG and SEM, and the target components were recovered step by step by acid leaching method. The results show that after roasting modification and crushing treatment, the bonding degree of EVA decreases, the dissociation degree of EVA increases, and the crushing effect is strengthened. After crushing, the yield of fine-grained components increase by 15%, and the valuable metals in different particle size components are selectively enriched. The selective dissociation behavior of multiple components is strengthened by grinding aid, and the selective crushing effect index φ reaches 0.112. The leaching rates of Cu, Ag, Al and Si are 98.33%, 94.12%, 97.21% and 95.17%, respectively, and the removal rate of Pb2+ is 93.53%. This process can provide technical reference for the development of short-range, clean and green recycling process for decommissioned crystalline silicon photovoltaic solar cells.
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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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