Separation and recovery of copper in Cu−As-bearing copper electrorefining black slime by oxidation acid leaching and sulfide precipitation

摘要: Abstract A new hydrometallurgical route for separation and recovery of Cu from Cu−As-bearing copper electro- refining black slime was developed. The proposed process comprised oxidation acid leaching selective sulfide precipitation the leachate. effects various parameters on As were investigated. At first stage, extraction 95.2% 97.6% obtained at 80 °C after 4 h with initial H2SO4 concentration 1.0 mol/L liquid-to-solid ratio 10 mL/g. In addition, kinetics successfully reproduced by Avrami model, apparent activation energies found to be 33.6 35.1 kJ/mol reaction, respectively, suggesting a combination chemical reaction diffusion control. During precipitation, about 99.4% recovered as CuS, while only 0.1% precipitated under optimal conditions using sulfide-to-copper 2.4:1, time 1.5 temperature 25 °C.