Study on ammonia leaching process of alkali leachingresidue of copper smelting dust

Alkali leaching residue of copper converter flue dust as ra w material, copper and zinc leaching influence of ammonia -ammonium sulphate system was investigated. The effects of pH, total ammonia concentration, NH₃/NH₄⁺, ratio of solid to liquid, leaching temperature and time on the leaching law of alkali leaching residue of copper converter flue dust were studied. The results show that copper and zinc leaching rate are 90.6 % and 92.4 % under the optimum condition. Such as total ammonia concentration is 5 mol/L,pH is 10, NH₃/NH₄ is 2:1,L/S is 5:1, leaching temperature is 70 ℃,leaching time is 60 minute.