METHOD OF REGENERATING CATALYST FOR DISCHARGE GAS TREATMENT AND CATALYST FOR DISCHARGE GAS TREATMENT OBTAINED BY THE METHOD

摘要

Provided is a method of regenerating an exhaust gas treatment catalyst 11 having ash adhered to a surface thereof. The method includes a crushing step (S1) in which the exhaust gas treatment catalyst (11) is crushed such that 70 to 95 wt% of the whole exhaust gas treatment catalyst (11) becomes coarse pieces (12) having a size exceeding a threshold size (S) (any value in a range of 0.105 to 1.0 mm); a separating step (S2) in which the fragments obtained by crushing the exhaust gas treatment catalyst (11) are separated into the coarse pieces (12) having a size exceeding threshold size (S) and fine particles (13) having a size not larger than the threshold size (S); a pulverizing step (S3) in which the coarse pieces (12) thus separated are pulverized to a fine powder having an average particle diameter of not larger than 0.1 mm; a kneading step (S4) and a molding step (S5) in which the fine powder is kneaded with other raw materials and molded into an exhaust gas treatment catalyst; and a drying step (S6) and a calcining step (S7) in which the molded precursor is dried and calcined to thus obtain a regenerated exhaust gas treatment catalyst (14).