Abstract: A novel recovery process for removing NO from flue gas with the recovery process of absorption with acid following complexation with ferrous chelate in aqueous solution and reduction with iron powder was proposed. The effect of O₂ content in stimulated flue gas on the NO complexing capacity of denitrification liquor and the parameters influencing the NO removal efficiency, including the amount of iron powder, the size of iron powder particulate, and the rotating speed of reactor, were investigated in detail. The optimal NO removal conditions for denitrificaiton process with iron powder were established. The difference for removing NO with iron filings and iron powder was compared. The results show that capacity for NO decreases by 90.2% when the O₂ content in the simulated flue gas increases from 0 to 4.2%. Denitrification efficiency increases with the increasing of the amount of iron powder and rotating speed of the reactor, and decreases with the increasing of the size of iron powder particulate. Under the optimal conditions of the amount of iron powder 0.8 g, the size of iron powder particulate over 200 mesh（≤0.077 mm）, and the rotating speed of the reactor 900 r/min, NO removal efficiency for flue gas containing O₂ content of 5% exceeds 90% in the stirred reactor. Denitrification efficiency with iron powder in a stirred reactor can be comparison with iron filings in two series bubble column.