Abstract:In a non-ferrous metal smelting enterprise in Guangxi, the tellurium alkaline slag produced during the recovery of precious metals from copper anode slime has a high tellurium content of 32%, and the recovery rate of tellurium of the existing process is low. The wet leaching test of tellurium alkaline slag produced in the process of anode slime smelting was carried out. The process of water leaching, H2SO4 neutralization, selenium precipitation with hydroxylamine hydrochloride (HONH3Cl), and Na2SO3 reduction was used to treat the tellurium alkaline residue. The effects of water leaching time, liquid-solid ratio (L/S) and temperature on the leaching efficiency of tellurium were investigated. The effects of temperature, time and dosage of HONH3Cl on the separation of selenium were also investigated. The results show that leaching efficiency of tellurium is the best under the conditions including leaching time of 1 h, L/S=4, and temperature of 55 ℃. When the temperature is 80 ℃, the time is 2 h, and the dosage of HONH3Cl is 3 times of the theoretical value, the effect of selenium precipitation is the best. The separation rate is 99.99% above, and the purity of recovered tellurium powder is 99% above. The process can effectively separate selenium to recover tellurium, and has the advantages of simple process, safe production environment, low cost and high efficiency, and has the prospect of industrialization.