Preparation of highpurity tellurium powder by
This hydrometallurgical method consists of oxidation leaching, sulfide impurities removing, and sulfur dioxide reduction. The crude tellurium powder was treated by H2O2 oxidation for h at pH when adding 50 ml H2O2 (30 %) per 100 g raw material, a tellurium recover rate around 91 % is achieved. The tellurium leaching ratio can reach % under mol#183;L1 NaOH concentration in