Tungsten trioxide 

 Grade Excellent use categories industrial pure GR 
 Content of 99.9 (%) Spec 100 one kilogram 
 CAS 1314-35-8 
 QS_Y4_FX3A 

 LR type test reagent grade salts 
 99.95 (%) 

 Oxide? TUNGSTEN TRIOXIDE) 
 Molecular formula: WO3 molecular weight: 231.85 

 1 nature of the 

 Yellow orthorhombic crystalline powder. Color when heated by the light to dark. Specific gravity of 7.16g / c m3, the melting point of 1473 ℃, boiling point is 1750 ℃, 850 ℃ was significantly elevated, melting green. Stable in air, insoluble in water and inorganic acids except hydrofluoric acid, can slow dissolve in hot concentrated ammonia and sodium hydroxide solution. 

 (2) use 

 Tungsten can be used as raw material for manufacturing, manufacturing carbide, cutting tools, molds and pull tungsten wire can also be used for powder metallurgy, but also for X-ray screen and fire protection fabrics, as well as ceramic colorants and analytical reagent . 

 3 production system 

 By the eutectic tungsten and sodium hydroxide, together with hydrochloric acid, then with ammonium chloride, generating acid obtained after calcination tungsten trioxide. The reaction is as follows: 

 MnWO4 · FeWO4 +4 NaOH → 2Na2WO4 + Fe (OH) 2 · Mn (OH) 2 
 12Na2WO4 +14 HCl → 5Na2O · 12WO3 +14 NaCl +7 H2O 
 5Na2O · 12WO3 +10 NH4Cl → 5 (NH4) 2O · 12WO3 +10 NaCl 
 5 (NH4) 2.12 WO3 +10 HCl +7 H2O → 12H2WO4 +10 NH4Cl 
 H2WO4 → WO3 + H2O 



 Yttrium oxide (Y2o3) 99.9% 280 元 / kg 99.99% 330 yuan / kg 
 Lanthanum oxide (La2o3) 99.9% 120 元 / kg 99.99% 150 yuan / kg 
 Cerium oxide (Ceo2) 99.9% 130 元 / kg 99.99% 320 yuan / kg 
 Praseodymium oxide (Pr6on) 99.9% 500 元 / kg 99.99% 700 yuan / kg 
 Neodymium oxide (Nd2o3) 99.9% 750 元 / kg 99.99% 1000 yuan / kg 
 Samarium oxide (Sm2o3) 99.9% 150 元 / kg 99.99% 260 yuan / kg 
 Europium oxide (Eu2o3) 99.9% 13500 元 / kg 99.99% 17500 yuan / kg 
 Gadolinium oxide (Gd2o3) 99.9% 320 元 / kg 99.99% 450 yuan / kg 
 Terbium oxide (Tb4o3) 99.9% 13500 元 / kg 99.99% 17000 yuan / kg 
 Dysprosium oxide (Dy2o3) 99.9% 8500 元 / kg 99.99% 11500 yuan / kg 
 Holmium oxide (Ho2o3) 99.9% 2800 元 / kg 99.99% 3500 yuan / kg 
 Erbium oxide (Er2o3) 99.9% 750 元 / kg 99.99% 1200 yuan / kg 
 Thulium oxide (Tm2o3) 99.9% 6500 元 / kg 99.99% 9500 yuan / kg 
 Ytterbium oxide (Yb2o3) 99.9% 350 元 / kg 99.99% 500 yuan / kg 
 Lutetium oxide (Lu2o3) 99.9% 12000 元 / kg 99.99% 14500 yuan / kg