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| Low Temperature Roasting Modification - Mechanical Crushing Separation and Recycling of Waste Photovoltaic Cells |
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Received:March 30, 2023
Revised:April 04, 2023
Accepted:April 06, 2023
Published Online:August 11, 2023
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| DOI：doi：10.3969/j.issn.1007-7545.2023.09.006 |
| KeyWord:crystalline silicon solar cells; roasting; weakening of EVA bonding; dissociation; selective crushing; acid leaching |
| Author | Institution |
| WANG Hongxue |
太原理工大学 |
| FU Yuanpeng |
太原理工大学 |
| FAN Yuping |
太原理工大学 |
| DONG Xianshu |
太原理工大学 |
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| Abstract: |
| The modification of EVA in waste crystalline silicon solar cells is the key to improve the dissociation effect of bond system, and separation and leaching efficiency of valuable components. EVA bonding behavior was weakened by roasting modification, and multi-component selective crushing characteristics of crystalline silicon solar cells were strengthened. Material distribution, EVA bonding weakening behavior, dissociation effect and metal recovery rate were analyzed based on XRD, TG, SEM and ICP-OES. The experimental results show that after crushing, the backplane material is distributed in +0.5 mm grain size, Al is in -0.5+0.25 mm and -0.045 mm grain size, Ag is in -0.045 mm grain size, Si is in -0.5+0.25 mm and -0.075 mm grain size, and the particle size distribution of different components is significantly different. After roasting at 300 ℃ for 5 h, the bonding degree of EVA decreases, the dissociation degree of the material increases, and the crushing effect is enhanced. After crushing, the yield of fine fractions rises by 15%. The recovery of Si, Ag and Al is 83.26, 87.11% and 88.61%, respectively. The research has important guiding significance for efficient recycling of waste crystalline silicon solar cells. |
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