Recycling Tungsten Trioxide in Waste SCR Denitration Catalyst

The development of SCR denitration catalyst is based on the technology of selective catalytic reduction (SCR), the SCR system is an integral and important part of SCR systems. In performance, the denitration catalyst is the key to success of the project, its components, structure, life and its associated parameters directly affect the health of denitration efficiency and SCR systems. SCR denitration catalyst can be classified according to different raw materials, structure, extent, use and other standards. There are mainly three types in SCR denitration catalyst: 1) precious metal type; 2), metal oxide type; 3), zeolite type of ion exchange. The type of metal oxide is currently the more popular, it is also more widely used, and such catalysts is based on the carrier of titanium dioxide, vanadium pentoxide, tungsten trioxide the active ingredient.

Steps
(1)Crushing SCR denitration catalyst to dry powder, and roasting it in high-temperature;
(2) Adding a solution of soluble tungsten trioxide component and heating it in the above step (1) that the resulting is dry powder;
(3) Collecting the supernatant after fully dissolving, and make the liquid-solid layers clean;
(4) Adding the solid in the step (3) and the composition of tungsten trioxide to the reaction vessel together, and repeating the step (2);
(5) Repeating the step(3) and (4) at least once;
(6) Collecting several components and dissolving tungsten trioxide that was evaporated to dryness and sufficiently, drying to obtain a solid;
(7) Sintering the resulting solid in the step (6) at high temperature, and we can recycle the component of tungsten trioxide in the waste SCR denitration catalyst.