Cellular SCR denitration catalyst will partly or entirely loss activity after being used for some time, thus cannot to be effective and bring out a lot of waste catalysts. If we don’t recover the noble metals such as titanium, tungsten, and vanadium in the catalysts, it will inevitably result in resources wasted, environmental pollution and costs increased.

 

If we can change waste into treasure, which means recovering the waste catalysts as raw materials for producing catalyst, making these materials circulating, we guess it would be a very good approach. A method that recovering powder containing tungsten trioxide from waste cellular SCR denitration catalyst have been pointed out. The steps are as follows:

 

1. Crushing: Crushing the waste SCR denitration catalyst into 30~50mm pieces by a crusher, and also clearing away the ash by a shaker;

2. Cleaning: Cleaning the catalysts after crushing by an ultrasonic for 1 hour, and then washing by water; 

3. Drying: Drying the catalyst after cleaning in an oven at 100-150°C for 10~15 hours;

4. Grinding: Grinding the dried catalyst into powder with particle size of 5-50um, then the waste SCR denitration catalyst containing tungsten trioxide obtained.

 

The recovered waste SCR denitration catalyst containing tungsten trioxide can be reused as the material for producing fresh catalyst, thus to achieve the goal of recycling. The implementation is: mixing the raw materials titanium dioxide, glass fibers, waste SCR denitration catalyst recycled material, tungsten trioxide, vanadium pentoxide and deionized water, after kneading, extruding, drying and calcining to prepare SCR denitration catalyst.