Chemisorptive catalytic oxidation process for SO2 from smelting waste gases by Fe(II)

Abstract

Chemisorption of SO₂ from smelting plant exhaust gases in a single sieve plate column was investigated. Main parameters were SO₂ and O₂ gas and H₂SO₄, FeSO₄ and Al₂(SO₄)₃ liquid concentrations on reaction rate and equilibrium in FeII-EDTA solutions. Absence of inhibitors with this kind of flue gases promote fast kinetics. Optimal process conditions with 3% wt. FeSO₄ catalyst up to 2000 PPM SO₂. Maximum yield of 16% H₂SO₄ could be achieved considering optimal liquid/vapor ratio, oxygen surplus and insert salt concentrations.