Sustainable Mining and Metallurgy

The problem of incomplete oxidation exists in the zinc hydrometallurgical process of zinc oxide desulfurization-air oxidation in an enterprise. The incompletely oxidized ZnSO3 react with Fe3+ in the leaching and jarosite precipitation section and reduced it to Fe2+. The high Fe2+ content in that section increased the consumption of manganese ore powder. This article analyzed effects of acid making equipment, roasting feed quantity, oxidation temperature, level in desulfurization tower and other factors on the air oxidation of desulfurization solution and raised a series of measures. And experimental study was conducted to find the optimum air oxidation conditions. Experiment results show that the optimum air oxidation conditions are as follows: 40~45℃ oxidation temperature, 3h reaction time and 0.15MPa air pressure. By the optimization measures, the oxidization efficiency of the desulfurization solution is substantially improved, the consumption of manganese ore powder is reducing, and the electric efficiency is improving.