| Abstract Scope |
In this paper, three different processes– chelation accompanied by oxidation, oxidation followed by chelation and oxidative acid leaching followed by chelation, are designed for extractive of oxide-sulphide zinc ore, Through a comparison of the redox potentials, suitable oxidation additives are determined for each process. Besides, effects of oxidant additives doping level on zinc recovery are investigated. Results show that, in the process of chelation accompanied by oxidation, zinc leaching degree can reach 83.72% with addition of Na2O2 being 0.3 mol/L, in the process of oxidation followed by chelation, optimum leaching rate of oxide-sulphide zinc ore is 92.40% with Na2O2 adding 0.5 mol/L, and in the process of oxidative acid leaching followed by chelation, leaching degree of zinc reaches 93.02% under a condition of NaClO doping level being 0.1 mol/L. All three processes prove their value on extractive of oxide-sulphide zinc ores. |