Using Scr Denitration Catalyst to Recover Tungsten Trioxide

Tungsten trioxide and partial ammonium recovered from SCR denitration catalyst not only can reduce the emission of pollutants but also can take full advantage of residue, so this method gets widespread attention. Using SCR denitration catalyst to recover tungsten trioxide and ammonium methods are as follows:
1. Crushing and sieving SCR denitration catalyst to produce catalyst powder, and then mixed it with sodium carbonate evenly.
2. Putting mixed powder into furnace fired becomes sinter.
3. After one hour heat preservation then crushing and sieving into sinter powder. Pour the warm water to make the NA₂WO₄ and NAVO₃ of sintered powder fully dissolved, after filtered and abandoned precipitate to get Na₂WO₄ and NaVO₃ mixed solution.
4. After adjusting the PH value to 6.5 to 7.5, ammonium bicarbonate or ammonium chloride solution was added to precipitate ammonium metavanadate after filtered and washed by dilute bicarbonate solution for 2-3 times, then washed with 30% ethanol for 1-2 times, after drying to obtain metavanadate products.
5. The Na₂WO₄ of remaining solution was been converted into ammonium paratungstate, the remaining solution was evaporated to obtain crystals of ammonium paratungstate, and then calcined to obtain tungsten trioxide.


Tungsten Manufacturer & Supplier: Chinatungsten Online - http://www.chinatungsten.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn
 

• < Prev
• Next >