Shaanxi BLOOM Tech Co., Ltd. is one of the most experienced manufacturers and suppliers of sodium tungstate powder cas 13472-45-2 in China. Welcome to wholesale bulk high quality sodium tungstate powder cas 13472-45-2 for sale here from our factory. Good service and reasonable price are available.
Sodium tungstate powder, mainly composed of inorganic substances, CAS 13472-45-2, The chemical formula is Na2WO4, and sodium tungstate is a colorless crystal or white rhombohedral crystal, glossy flake crystal or crystalline powder. Sodium tungstate is easily soluble in water, and the aqueous solution is slightly alkaline, insoluble in ethanol, and slightly soluble in ammonia water. Weathering in the air. When heated to 100 ℃, it loses its crystalline water and becomes anhydrous.
Reacts with strong acids (excluding hydrofluoric acid) to form insoluble yellow tungstic acid, reacts with phosphoric acid or phosphate to form phosphotungstic acid complexes, and reacts with organic acids such as tartaric acid, citric acid, oxalic acid to form corresponding organic acid complexes. Used as a mordant, analytical reagent, catalyst, water treatment agent, fireproof and waterproof material, phosphotungstate, borotungstate, etc.
|
Chemical Formula |
Na2O4W |
|
Exact Mass |
294 |
|
Molecular Weight |
294 |
|
m/z |
294 (100.0%), 296 (92.8%), 292 (86.5%), 293 (46.7%) |
|
Elemental Analysis |
Na, 15.65; O, 21.78; W, 62.57 |
|
|
|
As a common chemical, Sodium Tungstate can be synthesized in the following ways:
1. Wolframite is crushed to 320 mesh by alkali hydrolysis of wolframite, and then added to the reactor with 30% caustic soda for alkali hydrolysis. After alkali hydrolysis, it reacts with calcium chloride to synthesize calcium tungstate. Calcium tungstate reacts with hydrochloric acid to produce tungstic acid, and then reacts with caustic soda to produce sodium tungstate. After evaporation crystallization, centrifugal dehydration, and drying, the finished product of sodium tungstate is obtained.
2. In industry, raw mineral wolframite is extracted with aqueous solution of sodium tungstate solution to make crude sodium tungstate, then the crude product is made into WO3 · 2H2O with acid, and then Na2WO4 · 2H2O with sodium hydroxide again. The refining method can be recrystallized with water. If more pure products are needed, add the aqueous solution to hot concentrated hydrochloric acid to precipitate tungsten oxide monohydrate WO3 · H2O precipitation. Wash the precipitate repeatedly, and then dissolve it in sodium hydroxide aqueous solution to precipitate and crystallize it. Decahydrate can be obtained below 6 ℃, while dihydrate can be obtained above 6 ℃.
Sodium Tungstate Powder is a compound containing tungsten and has multiple uses. The following are the detailed uses of sodium tungstate in mordants, analytical reagents, catalysts, water treatment agents, fire and waterproof materials, phosphotungstate salts, and boron tungstate:
1. Mordant: Sodium tungstate is used in dyeing processes as a mordant. It is an effective mordant that can form complexes with certain metal ions, giving textiles or other materials a long-lasting color. This application method is particularly widely used in the textile industry. Using sodium tungstate as a mordant can improve the dyeing effect, enhance the brightness and durability of the color.
2. Analytical reagent: Sodium tungstate can be used as an analytical reagent for the photometric determination of certain metal ions, such as iron, copper, etc. It forms complexes with these metal ions, making it convenient for quantitative analysis. This application method has important value in the field of chemical analysis. Using sodium tungstate as an analytical reagent can simplify the analysis process, improve the accuracy and sensitivity of the analysis.
3. Catalyst: Sodium tungstate can be used as a catalyst in certain chemical reactions. It can promote the oxidation reaction of organic matter, thereby producing the required organic compounds. This application method is of great significance in chemical production. Using sodium tungstate as a catalyst can improve reaction efficiency, increase product selectivity and yield.
5. Fire resistant and waterproof materials: Sodium tungstate can be used to produce fire resistant and waterproof materials. These materials have excellent fire resistance and waterproofing, and are widely used in fields such as construction and home furnishings. Using sodium tungstate as a raw material can improve the performance of the material, enhance its fire resistance and waterproof effect.
4. Water treatment agent: Sodium tungstate can be used as a water treatment agent to purify water quality. It can form complexes with certain harmful ions in water, thereby removing these harmful ions and improving water quality. This application method is widely used in the field of water treatment. Using sodium tungstate as a water treatment agent can remove harmful substances such as heavy metal ions and organic pollutants from water, protecting the aquatic ecological environment.
6. Phosphotungstate: Sodium tungstate and phosphorus compounds can be used to synthesize phosphotungstate, which is a substance with high catalytic activity and is widely used in fields such as catalysts and optoelectronic materials. Sodium tungstate can be used as a raw material to synthesize phosphotungstate salts with different structures, achieving performance control.
7. Boron tungstate: Sodium Tungstate Powder can be used to synthesize boron tungstate, which is a substance with high hardness, high melting point, and excellent conductivity, and is widely used in fields such as electronics and machinery. Sodium tungstate can be used as a raw material to synthesize boron tungstate with different structures, achieving performance control.
8. Sodium tungstate, as a co solvent, can be introduced into enamel pigments to reduce firing temperature and complement all uses:
8.1 Enamel Industry: In the enamel industry, sodium tungstate is often used as a co solvent and mixed with enamel pigments. By adding sodium tungstate, the firing temperature of enamel can be reduced, the firing time can be shortened, and production efficiency can be improved. In addition, sodium tungstate can also improve the smoothness, hardness, and corrosion resistance of enamel.
8.2 Ceramic Industry: In the ceramic industry, sodium tungstate is also used as a co solvent in the manufacturing of glazes and ceramic vessels. By introducing sodium tungstate, the firing temperature can be lowered, energy consumption can be reduced, and the quality of ceramic products can be improved.
8.3 Glass manufacturing: Sodium tungstate can serve as one of the co solvents in the glass manufacturing process, helping to introduce enamel pigments to produce glass products with specific colors and properties. Sodium tungstate can also be used to manufacture special glass, such as bulletproof glass, high-strength glass, etc.
8.4 Metal surface treatment: In the field of metal surface treatment, sodium tungstate can be mixed with enamel pigments to form a dense protective film, improving the corrosion resistance and wear resistance of the metal. In addition, sodium tungstate can also be used to manufacture special metal coatings.
8.5 Complementary color: Sodium tungstate can also be used for complementary color, especially in the manufacturing process of enamel and ceramic products. Due to its good solubility and stability, sodium tungstate can be mixed with other pigments to accurately adjust the color of the product and achieve the desired color effect.
Product content determination
Determination of tungsten trioxide (WO3) content in sodium tungstate (Xinkoning gravimetric method)
In a hot solution with a pH value of 3.00-4.4, tungstic acid is precipitated with hydrochloric acid and separated from impurities. After calcination, it becomes tungsten trioxide, which is weighed and compared by color.
Methyl violet indicator 0.1%, hydrochloric acid (1+1), Xinkening hydrochloric acid solution 10% (prepared with 1+1 hydrochloric acid), Xinkening hydrochloric acid washing solution 0.2%, solid NaOH, and broad test paper.
Weigh 0.5 grams of the sample into a 250ml beaker, dissolve it in a small amount of water, add 100ml of hot water at 60-80 ℃, 2 drops of 0.1% methyl orange indicator (if the indicator is brown, add more), and neutralize it with hydrochloric acid (1+1) until it turns red. While stirring continuously, add 10ml of 10% Xinkening and continue stirring to make the precipitate coagulate. If the upper layer is clear, let it stand. After the precipitate sinks, filter it with a quick quantitative filter paper. The filtrate is received in a 250ml volumetric flask, and the precipitate is washed with 0.2% Xinkening washing solution at least five times. After washing, the precipitate is transferred to a porcelain crucible together with the filter paper, dried and carbonized on an electric furnace, and then carbonized and burned in a 750-800 ℃ muffle furnace for 30-45 minutes, cooled, and weighed. The sentence is:. The filtrate was subjected to tannin and methyl violet colorimetric method.
WO3 (%)=(W/G) × 100+C. In the formula: W - weight of tungsten trioxide (grams), G - weight of the sample weighed (grams), C - WO3 content measured in the filtrate.
① The precipitation must be washed away with sodium ions, otherwise the burnt material will turn black and the result will be higher.
② The indicator can be 0.1% methyl orange, at which point the filtrate can be analyzed using the thiocyanate colorimetric method.
The method is as follows: Pour the filtrate from the volumetric flask back into the beaker containing the original sample, add solid NaOH to the beaker until the pH of the filtrate is greater than 12, then pour the filtrate back into a 250ml volumetric flask, dilute to the mark, dry filter, and follow the sodium tungstate powder spectrophotometric method.
FAQ
What is sodium tungstate used for?
Sodium tungstate is used in electroplating processes to provide a protective and decorative coating on various metal surfaces. It enhances the durability, corrosion resistance, and aesthetic appearance of the plated objects.
How to prepare 10% sodium tungstate solution?
Protein precipitant–10 g sodium tungstate, 10 g disodium hydrogen phosphate (Na2HPO4) and 9 g sodium chloride are dissolved in 800 ml distilled water. Add 125 ml N HCl to bring the pH to 3.0 (check with narrow range indicator paper).
How to make sodium tungstate?
A method for the preparation of sodium tungstate by the oxidation of hard metal scrap and/or heavy metal scrap in a molten salt mixture of hydroxide and sodium sulfate.
Hot Tags: sodium tungstate powder cas 13472-45-2, suppliers, manufacturers, factory, wholesale, buy, price, bulk, for sale, 1 10 Phenanthroline Powder CAS 66 71 7, 1 AMINO 2 NAPHTHOL 4 SULFONIC ACID, Atropic acid, Lanthanum Nitrate Hexahydrate, 3 Aminopyrazine 2 carboxylic acid, Sodium Thiosulfate Pentahydrate CAS 10102 17 7