FIELD: technological processes.
SUBSTANCE: this invention relates to a method to regenerate a catalyst for treatment of waste gas and to a catalyst regenerated by this method. The method to regenerate a catalyst 11 is described to treat waste gas containing ash stuck on its surface. The method includes grinding stage S1, in which the catalyst 11 for waste gas treatment is ground so that from 70 to 95 wt % of the entire catalyst 11 for waste gas treatment is turned into bulk pieces 12, with size that exceeds threshold size S (any value in the range from 0.105 to 1.0 mm); separation stage S2, in which fragments produced by grinding of the catalyst 11 for waste gas treatment, are separated into bulk pieces 12, having size that exceeds threshold size S, and fine particles 13, having size that is not more than threshold size S; stage S3 of grinding into powder, in which bulk pieces 12, separated this way, are ground into fine powder, having average diameter of particles of not more than 0.1 mm; stage S4 of mixing and stage S5 of forming, in which fine powder is mixed with other raw materials and is formed as catalyst for waste gas treatment; and stage S6 of drying and stage S7 of calcination, in which the formed precursor is dried and calcinated to thus produce the regenerated catalyst 14 for waste gas treatment. Catalyst is described, regenerated by this method.
EFFECT: production of regenerated catalyst having efficiency equivalent for a newly prepared catalyst.
7 cl, 3 tbl, 2 ex, 2 dwg
