Abstract
In order to approach an applicable method of purifying smelting-gases containing SO 2 in low concentration, the catalytic oxidation of SO 2 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 H 2SO 4 in the solution rises to 20%, the removal efficiency of SO 2 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.
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