BGC > Product Search > Sodium tungstate 2-hydrate | 10213-10-2

Appearance	White Crystalline
WO3	≥ 69.0%
MO	≤ 0.02%
As	≤ 0.002%
Cu	------
Fe	≤ 0.002%
SO4	≤ 0.02%
Si	------
Water insoluble	≤ 0.01%
PH	8~9
Heavy metal (as Pb)	≤ 0.002%
Cl	≤ 0.03%

Molecular Formula: H4Na2O6W
Molecular Weight: 329.85
Hazard Symbols: Xn
WGKGermany: 1
HS Code: 28418000

CAS:10213-10-2
Molecular Formula:H2NaO5W-
Molecular Weight:288.84
EINECS:600-275-2
Synonyms:SODIUM TUNGSTATE 2H2O; SODIUM TUNGSTATE-2-HYDRATE;
SODIUM TUNGSTATE DIHYDRATE; SODIUM TUNGSTATE HYDRATED;
SODIUM TUNGSTATE(VI) DIHYDRATE; TUNGSTIC ACID NA-SALT 2H2O;
TUNGSTIC ACID SODIUM SALT DIHYDRATE; Tungsticaciddisodiumsaltdihydrate

Molecular Fomula: H4Na2O6W
Molecular Weight: 329.85
Appearance: White Crystalline
Purity: 98%

Na2WO4.2H2O, % ≥ 98.0

Wo3, % ≥ 69

MO,% ≤ 0.02

Fe, % ≤ 0.005

As, % ≤ 0.003

SO4, % ≤ 0.02

Pb, % ≤ 0.003

Cl, % ≤ 0.03

Water Insoluble Matter,% ≤ 0.01

Product name: sodium tungstate
Sodium tungstate dihydrate; sodium tungstate dihydrate; sodium tungstate dihydrate; sodium tungstate dihydrate; sodium tungstate dihydrate, ACS, 99.0-101.0 %; Sodium tungstate 2 water
English name: Sodium tungstate dihydrate
SODIUM TUNGSTATE OXIDE; SODIUM TUNGSTATE OXIDE, SOHYUM TUNGSTATE; SODIUM TUNGSTATE 2H2O; SODIUM TUNGSTATE-2-HYDRATE; SODIUM TUNGSTATE OXIDE;
CAS: 10213-10-2
Molecular formula: H4Na2O6W
Molecular Weight: 329.85
EINECS: 236-743-4
Related Categories: Cp Molybdenum, Titanium, Tungsten, Vanadium, Zirconium; Inorganic Chemicals; Inorganic Salt; Textile Dyeing and Printing Auxiliaries; Textile Dyeing and Finishing Auxiliaries; Chemical Auxiliaries; Metal tungstate; Rare Metal; Catalysis and Inorganic Chemistry; Reagents; tungsten; biochemistry; inorganic compounds and salts
Mol file: 10213-10-2.mol

Melting point: 698 ° C (lit.)
Density 4.18
Solubility H2O: 1 M at 20 ° C, clear, colorless
Water Solubility 730 g / L (20 ºC)
Merck 14, 8698
CAS database 10213-10-2 (CAS DataBase Reference)

Toxicity of sodium tungstate than other compounds of tungsten toxicity. The allowable concentration of lmg / m3. Other See tungsten trioxide.
Chemical properties Colorless crystal or white rhombic crystal. Dissolved in water, was slightly alkaline. Insoluble in ethanol, slightly soluble in ammonia.
Uses Used in the manufacture of metal tungsten, tungstic acid, tungstate, dyes, inks, catalysts and so on
Uses Used in the manufacture of metal tungsten, tungstic acid and tungstate. Used as a mordant, pigments and catalysts. Fabric can also do anti-fire agents and analytical chemical reagents.
Use Mainly used for metal tungsten, tungstic acid and tungstate manufacturing and dyes, pigments, inks, plating and so on. Also used for fabric and cellulose fire retardant, catalyst and so on. Electroplating grade and the use of catalysts must choose analytical purity.
Uses This product is used as fabric additives, sodium tungstate, ammonium sulfate ammonium phosphate and other mixtures used for fiber fire and water. Such fibers can be made of fire-resistant rayon and rayon. Can also be used for fabric worn, leather tanning, plating corrosion. This product can be used as a co-solvent to reduce the burning temperature and complementary color effect.
Production methods 1. Soda sintering process
Black tungsten concentrates Sintered sintered tungsten concentrates are ground through a 180 mesh sieve. According to the following proportion of ingredients: WO320% ~ 22%, 1.15 times the theoretical amount of soda, nitrite for tungsten ore 1% to 4%. The prepared material is mixed and then sent to the sintering furnace, sintering at 800 ~ 900 ℃. Smelting 2 ~ 3 h, condensed, crushed, sent to the extractor. Heating demineralized water, leaching, filtering with a cylinder filter, the filtered solution after purification by purification, concentration, crystallization, dehydration in the product.

Tungsten concentrate soda solution pressure cooking method Scallops scoop water slurry, into the pressure cooker and then add more than 1.5 times the theoretical amount of soda over the charge is heated to 200 to 225 ° C stirring, decomposition 4 Lt; / RTI & gt; The extract is filtered, the filtrate into the purifier by impurity processing, into the evaporator concentration. Cooling crystallization products.
2. caustic soda solution decomposition method will be a good roasted black tungsten concentrate smashed 320 mesh sieve. Belt conveyor to the hopper after adding metering in the alkali pot. Water stirring, in 80 ~ 90 ° C drop of 35% NaOH solution. The ratio of concentrate to lye is 1: (1.5 ~ 2.0). After the completion of the drop in 0.1 ~ 0.15 MPa under boiling about 4 h. Standing, the slurry clarified after filtration. The filtrate into the purifier for impurity processing, into the evaporator concentration. Cooling crystallization dehydration products.
Production methods tungsten ore alkaline solution to wolframite crushed to 320 mesh, with 30% caustic soda added to the reactor for alkaline hydrolysis, alkaline hydrolysis and calcium chloride synthesis of calcium tungstate, calcium tungstate and hydrochloric acid reaction of tungstic acid , And then with sodium hydroxide reaction of sodium tungstate, the evaporation of crystallization, centrifugal dehydration, drying, that was in sodium tungstate finished. its
MnWO4? FeWO4 + 4NaOH? 2Na2WO4 + Fe (OH)? Mn (OH) 2
Na2WO4 + CaCl2 → CaWO4 + 2NaCl
CaWO4 + 2HCl → CaCl2 + H2WO4
H2WO4 + 2NaOH → Na2WO4? 2H2O