Abstract:The alkali leaching method is used to selectively leaching the antimony from the tetrahedrite in the system of sodium sulfide and sodium hydroxide, Then, using alkaline leaching solution as raw material, high temperature and high pressure oxidation precipitation was used to generate sodium antimonate, and the effects of alkaline leaching process parameters on the antimony leaching rate and antimony precipitation process parameters on the precipitation rate of sodium antimonate were studied respectively. The results show that the leaching rate of tetrahedrite at room temperature and pressure is only 45%, which is much lower than the leaching rate of high temperature and high pressure alkali leaching. The best conditions of leaching antimony from tetrahedrite at high temperature and high pressure are: leaching temperature is 150 ℃, leaching time is 6 h, solid-liquid ratio is 6∶1, sodium sulfide concentration is 120 g/L, sodium hydroxide concentration is 80 g/L. Under these conditions, the leaching rate of antimony reaches 79% or more.The optimal reaction conditions for preparingsodium antimonate by high temperature and high pressure oxidation of tetrahedrite leachate are: reaction time is 2 h, sodium hydroxide excess coefficient is 1.6, oxygen pressure is 0.8 MPa, temperature is 150 ℃, in this case,, antimony deposition rate can be as high as 98%. The sodium antimonate prepared by this method was analyzed, and the product quality, particle size, and morphology all met the industrial needs.