Full
Outline
Aluminum in decommissioned crystalline silicon photovoltaic modules exists in two forms: aluminum frames and aluminum back-surface fields on solar cells, which have significantly different recovery routes. Current technologies face bottlenecks such as complex pretreatment and high environmental load. The classified recovery process was studied. For aluminum frames, temperature-controlled remelting combined with second-phase strengthening technology was used to produce recycled aluminum ingots. For aluminum in solar cells, a citric acid-hydrogen peroxide green chelating leaching system was employed for selective leaching, and the leachate was concentrated, followed by ethanol anti-solvent precipitation to produce aluminum citrate particles. The results show that the remelted aluminum ingots have an average grain size of 162.11 μm and a Vickers hardness of 42.4 HV, meeting the requirements of the national standard (GB/T 1196—2023) standard. The comprehensive processing cost of recycled aluminum is approximately 1.3-2.0 CNY/kg, with energy consumption only 4.86% that of primary aluminum and carbon emissions only 1/24 that of primary aluminum. Orthogonal experiments determined the optimal leaching conditions as follows: reaction temperature 80 ℃, reaction time 5 h, and citric acid concentration 1.5 mol/L. Under the conditions, the leaching rate of aluminum reaches 95.15%. FT-IR characterization confirmed that the product is aluminum citrate, which can be used to prepare crosslinking agents for oilfield profile control and water shutoff. This process does not require deep pretreatment of aluminum frames, avoids the high environmental load of traditional strong acid systems, achieves efficient recovery of aluminum in different forms, and provides a new pathway for the green and large-scale recycling of aluminum from decommissioned photovoltaic modules.
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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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