The chemical reagent tungstic acid is a polymeric compound formed of tungsten trioxide and water in different ratios and in different combinations. Different proportions of tungstic acid have different appearance colors, such as yellow tungstic acid, white tungstic acid, etc., among which yellow tungstic acid is more common. The general formula of tungstic acid is mWO3•nH2O, when the composition of tungstic acid is WO3•H2O, its chemical formula can be written as H2WO4, its density is 5.5g/cm3, insoluble in water, but easily soluble in alkaline solution and concentrated hydrochloric acid, And it will gradually gel after dipping. When the temperature rises to 100°C, it will dehydrate to form tungsten trioxide. Tungstic acid is insoluble in water, but soluble in ammonia water, alkaline solution and concentrated hydrochloric acid, where the ratio of n to m changes with the preparation conditions and drying conditions. Tungstic acid has strong chemical activity and photosensitivity.
The appearance of white tungstic acid is white powder, n:m>1.3, not only has high activity, but also has good photosensitivity and reduction. Metatungstic acid is a kind of polytungstic acid, its color is colorless, its structural formula is H6[H2(W3O10)4]•nH2O, n is 10 or 23, and its density is 3.93g/cm3. When the temperature rises by 50°C, it is easy to decompose, and its solubility in water is relatively large, which is 88.57g/100cm3 of water (25°C).
Tungstic acid is an important raw material for the synthesis of bismuth tungstate. Dissolve tungstic acid in a mixed solution of hydrogen peroxide and deionized water to obtain a tungstic acid solution. Add the tungstic acid solution and bismuth nitrate into the reaction kettle prepared with deionized water. Heating to 220 degrees Celsius for 24 hours and then cooling to room temperature, washing the reaction thickness solid with distilled water, and drying at 80 degrees Celsius can obtain powdered bismuth tungstate.
Tungstic acid chemical reagents can also be used to prepare phosphotungstic acid, fireproof and waterproof materials, water treatment chemicals, and are also raw materials for the manufacture of mordants, pigments, dyes and inks. In the textile industry, it can be used as a fabric weighting agent. The mixture of tungstic acid, ammonium sulfate and ammonium phosphate can be used on fibers to prevent fire and water. This fiber can be used to make rayon, rayon or used for leather tanning. It can also be used for anti-corrosion of electroplating coating, petroleum industry and aerospace material manufacturing, etc.
More details of tungsten oxide product, please visit website: tungsten-oxide.com
Please contact CHINATUNGSTEN for inquiry and order of tungsten oxide:
Email: sales@chinatungsten.com
Tel.: 86 592 5129595
