The invention discloses a preparation method of
pellets containing SCR waste catalysts, and belongs to the technical field of
pollutant emission reduction in the
sintering process. The preparation method comprises the following steps that firstly, inner-layer
pellets are prepared, then continuous
pelletizing is performed outside the inner-layer
pellets to grow the pellets to obtain outer-layer pellets, catalyst
layers are prepared outside the outer-layer pellets, and multi-layer pellets are finally prepared;
ammonia inhibitors and inner-layer
pelletizing materials are added into the inner-layer pellets, and the
ammonia inhibitors can release
ammonia gas after being heated and decomposed; pore-forming agents and outer-layer
pelletizing materials are added into the outer-layer pellets or part of the outer-layer pellets, and pores are formed in the outer-layer pellets in the
sintering process through the pore-forming agents. The pore-forming agents such as
ammonium bicarbonate in the multi-layer pellets are heated and decomposed to generate the pores, so that
decomposition of the ammonia inhibitors such as
urea and release of NH3 are delayed, the emission
window period of the ammonia inhibitors and the emission
window period of
NOX are consistent,
NOX emission is reduced, and synergistic emission reduction of SO2,
NOX and dioxin is achieved in a breakthrough mode under the action of the catalysts.