Experiment on Simultaneous Absorption of NO and SO 2 from Sintering Flue Gas by Oxidizing Agents of KMnO 4 /NaClO

A complex oxidizing agent combination made up of KMnO 4 and NaClO was used to investigate the simultaneous absorption of NO and SO 2 from sintering flue gas in a spray absorption tower on a laboratory scale. The effects of various operating parameters, i.e. initial gas temperature ( T g ), initial solution pH, molar ratio of NaClO/KMnO 4 (M), initial NO inlet concentration ( C N ) and SO 2 initial inlet concentration ( C S ), were systematically investigated in the experiments. The results showed that the removal efficiency of SO 2 was slightly affected by the reaction conditions and remained stable above 98%; however, the removal efficiency of NO was significantly influenced. It presented different trends with the reaction condition changed. The most optimal experimental conditions for simultaneous removal of NO and SO 2 were found to be initial solution pH=5.5, T g =50°C, M =3; in this case the average removal efficiencies of NO and SO 2 could reach 98.8 and 70.9%, respectively.