Liquid-phase catalytic oxidation of smelting-gases containing SO2 in low concentration

In order to approach an applicable method of purifying smelting-gases containing SO2 in low concentration, the catalytic oxidation of SO2 in low concentration in smelting-gas, using Mn+2, Fe+2 and Zn+2 in liquid-phase, was performed separately in a foam absorbing column in a copper smelter. The absorption solution, containing metal ions in an optimal proportion according to an orthogonal test, demonstrates an improved purification capability for smelting-gas. When the concentration of H2SO4 in the solution rises to 20%, the removal efficiency of SO2 in smelting-gas can be still maintained above 85%. The method is demonstrably effective for the waste gas treatment at small and mid-scale smelters of non-ferrous metals.