Abstract
Cadmium telluride waste contains a portion of rare metals. In this paper, a new, clean and efficient vulcanization-vacuum distillation process is used to separate the rare metal Te from cadmium telluride. Taking CdTe (99.99%) and S (99.99%) as examples, the feasibility of this process was verified on a laboratory scale. Recovery of cadmium telluride waste was simplified to two-step vulcanization and vacuum distillation process. The effects of temperature and time on vulcanization-vacuum distillation were investigated. The experimental results show that the purity of Te obtained by vacuum distillation was 99.92%, and the purity of cadmium sulfide was up to 99.5%. This method provides theoretical guidance for the recycling of cadmium telluride photovoltaic modules. Compared with the traditional methods, this process has a short refining process, does no generate waste water or waste gas, and is environmentally friendly. The Te and CdS obtained from vulcanization-vacuum distillation can be utilized as raw materials for semiconductor production after subsequent processing.
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