Abstract:Based on the dissolution difference of arsenic and antimony in acid solution, combined with the composition characteristics of arsenic-antimony dust and smelting waste acid, a combined disposal process of arsenic-antimony dust and smelting waste acid was proposed, which is arsenic separation by oxidizing acid leaching and arsenic fixation by hydro-reduction. The experimental results show that the leaching rate of arsenic can reach 99% above under the conditions including hydrogen peroxide feeding coefficient of 1, hydrogen peroxide mass fraction of 30%, liquid-solid ratio of 5, leaching temperature of 30 ℃, leaching time of 4 h, and waste acid acidity of 1 mol/L, and antimony content in the leaching residue is up to 90%, while the arsenic content is only 0.2%. Thus, the preliminary separation of arsenic and antimony in high-arsenic and antimony dust is realized. Using stannous chloride two-stage reduction process, and under the conditions of acidity of 12 mol/L, temperature of 90 ℃, mole ratio of n(NaCl)/n(As)=3, reductant coefficient of 1 and reaction time of 4 h, the reduction rate of arsenic can reach 99.75%, the concentration of antimony in the reaction solution is 6.72 g/L and the concentration of arsenic is only 0.17 g/L. The secondary separation of arsenic and antimony is realized.