Denitration Catalyst Recovering Tungsten Trioxide

SCR denitration catalyst is used in the power plant refers to SCR (selective catalytic reduction) systems denitration catalyst (Catalyst), in the SCR reaction, prompting selectively reducing nitrogen oxides in the flue gas chemical has a reaction at a temperature of substance. In recent years, the United States, Japan, Germany and other developed countries continue invest a lot of manpower, material and financial resources to research and develop the flue gas denitration catalyst. The initial catalyst is Pt-Rh and Pt and other metal catalyst in monolithic ceramics such as alumina, as carriers, has high activity and low reaction temperature characteristics, but the high price limits its application in power plants.

SCR denitration catalysts in the partial recovery of tungsten trioxide and ammonium methods are as follows:
1. Crushing and sieving the SCR denitration catalyst to prepare catalyst powder, mixing with sodium carbonate evenly.
2. The mixed powder is placed in a sintering furnace sinter.
3. Incubating it 1 hafter grinding, sifting it into sinter powder, then pourign the warm water to the sintered powder Na₂WO₄ and NaVO₃.
4. After adjusting the Ph value to 6.5 to 7.5, ammonium bicarbonate or ammonium chloride solution is added to precipitate ammonium metavanadate precipitate with dilute bicarbonate solution, washing it with 30% ethanol 1-2 times, after drying in metavanadate products.
5. The remaining solution Na₂WO₄ is converted into ammonium paratungstate, the remaining solution is evaporated to obtain crystals of ammonium paratungstate, and then calcineing it to obtain tungsten trioxide.

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