Method for Rematerializing Waste De-NOx Catalyst Using Inorganic Acid

The present method relates to a method of rematerializing a de-NO_x catalyst, the method which uses an organic acid to remove poisoning materials of the waste de-NO_x catalyst discarded after being used in a power plant or the like, thereby enabling the waste catalyst to be reused. A method of rematerializing the waste de-NO_x catalyst using the inorganic acid comprises: a step of collecting a waste catalyst component from a waste de-NO_x catalyst module; a pretreatment step of crushing the waste catalyst component and removing metallic foreign materials from the crushed waste catalyst component by using a magnet to obtain a pretreated waste catalyst; a step of reacting the pretreated waste catalyst with the inorganic acid to remove the poisoning materials in the waste catalyst; a step of filtering the poisoning material-removed waste catalyst to obtain a filtered waste catalyst and washing the filtered waste catalyst to obtain a washed waste catalyst; a step of firing the washed waste catalyst to obtain a fired waste catalyst; and a step of milling the fired waste catalyst to produce a fine powder from the fired waste catalyst. Since the method of the present invention is a method of removing the poisoning materials in the waste catalyst, the method can reduce preparation costs of the catalyst by minimizing loss amounts of effective catalyst components contained in the waste catalyst, and particularly enabling titanium dioxide and tungsten trioxide occupying most of a de-NO_x catalyst to be recovered such that the recovered titanium dioxide and tungsten trioxide can be rematerialized. Further, since the method of the present invention is a method of recovering titanium dioxide and tungsten trioxide by removing the poisoning materials such as sodium, potassium calcium, sulfur trioxide and the others that inhibit catalytic activities instead of performing a process of separating and extracting tungsten and vanadium, the process being expensive in the recovery of titanium dioxide and tungsten trioxide from the waste catalyst, the method reduces costs required in the rematerialization process. The method can reduce a rematerializing manufacturing process since the recovered titanium dioxide and tungsten trioxide can be reused as catalyst raw materials even without passing through a separate processing process. 본 발명은 발전소 등에서 사용된 후 폐기되는 폐탈질촉매의 피독물질을 무기산을 이용하여 제거함으로써 폐촉매의 재사용을 가능하게 하는 폐탈질촉매의 재 소재화 방법에 관한 것이다. 본 발명에 따른 폐탈질촉매의 재 소재화 방법은 폐촉매 중의 피독물질을 제거하는 방식이므로 폐촉매