Thermal delamination – meaning the removal of polymers from the module structure by a thermal process – as a first step in the recycling of crystalline silicon (c-Si) photovoltaic (PV) modules in order to enable the subsequent recovery of secondary raw materials was investigated. A correlation between treatment temperature and duration was established by an iterative process. Furthermore, chemical characterization of the resulting solid outputs (glass, cell, ribbons and residues) was performed in order to assess their further processing options. Additionally, the effect of removing the backsheet as a pre-treatment before the actual delamination process was investigated in relation to the aforementioned aspects of treatment duration and output quality. Results show that increased temperatures reduce the necessary treatment duration (65 minutes at 500°C, 33 minutes at 600°C) while generating the same output quality. The backsheet removal leads to an additional duration decrease of more than 45% at each considered temperature, while also having positive effects relating to fewer solid residues and easier flue gas handling. In regard to the main output specifications no significant influence of the pre-treatment is observed. Overall thermal delamination can be seen as a feasible method in order to obtain high value secondary raw materials from c-Si PV modules, while backsheet removal as pre-treatment should be considered as advantageous from multiple standpoints.

研究了热分层——即通过热过程从模块结构中去除聚合物——作为晶体硅 (c-Si) 光伏 (PV) 模块回收利用的第一步，以便能够随后回收二次原材料. 通过迭代过程建立治疗温度和持续时间之间的相关性。此外，对所得固体输出（玻璃、电池、色带和残留物）进行了化学表征，以评估它们的进一步处理选项。此外，研究了在实际分层过程之前去除背板作为预处理的效果，与上述处理持续时间和输出质量方面的关系。结果表明，升高的温度会减少必要的处理时间（500°C 下 65 分钟，600°C 下 33 分钟），同时产生相同的输出质量。背板去除导致在每个考虑的温度下额外的持续时间减少超过 45%，同时还具有与更少的固体残留物和更容易烟气处理有关的积极影响。关于主要输出规格，没有观察到预处理的显着影响。整体热分层可以被视为一种可行的方法，以便从 c-Si 光伏组件中获得高价值的二次原材料，而作为预处理的背板去除从多个角度来看应该被认为是有利的。背板去除导致在每个考虑的温度下额外的持续时间减少超过 45%，同时还具有与更少的固体残留物和更容易烟气处理有关的积极影响。关于主要输出规格，没有观察到预处理的显着影响。整体热分层可以被视为一种可行的方法，以便从 c-Si 光伏组件中获得高价值的二次原材料，而作为预处理的背板去除从多个角度来看应该被认为是有利的。背板去除导致在每个考虑的温度下额外的持续时间减少超过 45%，同时还具有与更少的固体残留物和更容易烟气处理有关的积极影响。关于主要输出规格，没有观察到预处理的显着影响。整体热分层可以被视为一种可行的方法，以便从 c-Si 光伏组件中获得高价值的二次原材料，而作为预处理的背板去除从多个角度来看应该被认为是有利的。