Preparation of Low Cost SCR Method for Denitration Catalyst

A low cost method to prepare SCR denitration catalyst which can reduce the preparation and operation cost, improve the abrasion resistant property of catalyst. The weight composes are like bellows: grounded slag powder takes 52~55%, gypsum 2.7~2.9%, partial ammonium metavanadate 1.3~1.5%, ammonium paratungstate 5.5~5.7%, silica sol 2.6~2.8%, clay 1.6~1.8%, glass fiber yarn 2.5~3.0%, methyl cellulose 2.7 to 2.9%, poly ethylene oxide 1.3~1.5%, a glycol ammonium 2.7~3.0%, distilled water of 20~23%.

The preparation steps are as follows:
1. Grinding and activate the carriers
Send grounded slag powder and gypsum by weight ratio of 17.9~20.4:1 into grinding equipment, inlet the high temperature steam (100 to 120℃), grinding and activate to get the carrier;
2. Preparation of slurry
Send carriers and ammonium metavanadate, ammonium paratungstate, silica sol, clay, glass, fiber, methyl cellulose, poly ethylene Huan and ethanol ammonium into the mixer, adding distilled water while stirring, stirring more than 2 hours until the solution uniform, to generate slurry with water below 25%;
3. Molding catalyst
Form the slurry in the required prepared shape, then dry and calcine to get the products we needed. The calcine conditions are like bellows: first calcined in 250~255℃ for 45~50 hours, then 370~390℃ calcined for 23~25 hours, again calcined at 445~455℃for 11~13 hours.