Method for recovering tellurium and bismuth from bismuth telluride waste

The invention discloses a method for preparing bismuth sulfide by recovering tellurium from bismuth telluride waste, and belongs to the technical field of pyrometallurgy of non-ferrous metals. The method comprises the following steps of crushing bismuth telluride waste to obtain bismuth telluride waste powder; fully and uniformly mixing bismuth telluride powder with sulfur powder, and pressing themixture into a cylinder; carrying out a vulcanization reaction on the cylindrical material under the conditions of being filled with protective gas, 300-450 DEG C and heat preservation time of 30-60min; putting a vulcanization product into a vacuum furnace, and carrying out vacuum distillation under the conditions of a pressure of 10 Pa, 400-700 DEG C and heat preservation time of 30-90 min so as to obtain condensate tellurium and residue bismuth sulfide. According to the method, tellurium is effectively recycled from the bismuth telluride waste through a pyrogenic process, secondary utilization of rare resource tell