PURPOSE: To carry out the desulfurization and denitration of an exhaust gas from a sintering machine availably from the point of view of economical efficiency, by a method wherein the exhaust gas after desulfurization treatment is introduced into the first half part of a sintering process to be subjected to denitration treatment to put the characteristics of the exhaust gas from the sintering machine to practical use and to effectively carry out desulfurization and denitration.

CONSTITUTION: The sintering of supplied ore (a) is advanced as said ore is moved to the ore discharge side of a sintering machine 21 from the ore supply side thereof and an exhaust gas is formed from window boxes 1W16. In this case, the exhaust gas is divided into two parts in the ore supply side (window boxes 1W11) with a low SO2 concn. and the ore discharge side (window boxes 12W16) with a high SO2 concn. The exhaust gas with a high SO2 concn. is introduced into a waste heat boiler after dust collection to be cooled to about 160°C or less and subjected to desulfurization in a desulfurization apparatus 26 while the treated exhaust gas is introduced into the pallet 27 of the ore supply side of the sintering machine without exhausting the same into the atmosphere to be taken out at about 100°C along with a gas generated in the ore supply side thereof and, after subjected to dust collection by an electric dust collector 22, subjected to denitration treatment in a denitration apparatus 23 to be exhausted from a chimney 24.