Fe-II(EDTA) solution has been considered an efficient option in wet flue gas denitrification, whereas the generated Fe-II(EDTA)-NO restricts its wide application, suggesting that Fe-II(EDTA)-NO reduction is the key to this process. This work investigated the performance, kinetics, and mechanism of Fe-II(EDTA)-NO reduction by Mn powder coupled with manganese ion (Mn2+) recovery. We initially studied the performance of Fe-II(EDTA)-NO reduction with respect to the major influencing factors (i.e., the particle size of Mn powder, initial Fe-II(EDTA)-NO concentration, Mn powder concentration, stirring speed, and temperature). Shrinking core model and Arrhenius law were applied to illustrate the kinetics and mechanism between Fe-II(EDTA)- NO solution and Mn powder, suggesting that the solid-liquid reaction was fitted on chemical reaction control, and the activation energy was calculated as 43.0 kJ mol(-1). The effects of main operating parameters, such as precipitant concentration, pH value, and temperature, were studied on Mn2+ recovery. Results indicated that the pseudo-second-order model could precisely describe the kinetics of Mn2+ recovery. Finally, according to Arrhenius and Eyring-Polanyi equations, the reaction activation energy, enthalpy of activation, and entropy of activation for Mn2+ recovery were calculated as 17.25 kJ mol(-1), 14.55 kJ mol(-1), and 252.07 J (k mol)(-1), respectively.