Patent ID: 8277772

Claim:
A hydrometallurgical method for extracting tellurium, comprising the steps of material selecting, leaching the selected material, and reducing and purifying a leach solution, which is characterized in that: the material selecting step includes selecting raw material with a tellurium content >1.8%; and the leaching step includes: placing the raw material in a leaching trough in which successively: (1) a solution and/or solid containing Cl − , Br − and NH 4 + is added at a ratio of Cl − >115 kg, Br − >16 kg and NH 4 + >62 kg per ton of the raw material, with the liquid-solid ratio between the liquid and raw material in the leaching trough >1.5, and leaching at ambient temperature for 1 to 3 hours, (2) then adding concentrated H 2 SO 4 in an amount of 500 to 1000 kg per ton of raw material and leaching for 1 to 3 hours with leaching temperature being 45-65° C., and the residual acidity being 0.5 to 1.5 N, (3) further adding NaClO 3 in an amount of 25 to 50 kg of NaClO 3 per ton of raw material, leaching under stirring for 2 hours or more with the leaching temperature being 75-95° C.; filtering and washing, and then collecting the leach solution.