Removal of arsenic from flue gas by using NaClO solution

An inexpensive process has been developed to remove arsenic from flue gas using NaClO solution. The various influencing factors, such as NaClO concentration, initial solution pH, reaction temperature, concentrations of O2, CO2, SO2 and NO in flue gas on the removal of arsenic were investigated experimentally at a self-made bubbling reactor, from which, the optimal experimental conditions were obtained with 1.0 L/min of flue gas flow rate, 100 mmol/L of NaClO solution, 6.0 of the solution pH and 60 °C of reaction temperature. And the average removal efficiency was achieved at about 97.5%. HPLC-HG-AFS analyses of products proved that the main reaction product was AsO43−. Combined with the analysis of the electrode potentials, the mechanism of As2O3 reaction with NaClO solution was proposed.