Tungsten Oxide

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BTO 281

BTO is the abbreviation of blue tungsten oxide, which refers to a type of dark blue powder containing tungsten (VI) and mixed valence of tungsten (V). In the industry, blue tungsten oxide refers to a mixture of WO2.72, WO2.90, W20O58 and (NH4) x•WO3. BTO, which is mainly composed of ammonium tungsten bronze (ATB) and WO2.90, is a good raw material for the production of tungsten materials and an excellent raw material for tungsten-based tungsten carbide and other tungsten products. Pyrogenic…

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Phosphotungstic Acid 311

Phosphotungstic acid is a kind of pale-white powder with acidity and oxidation-reduction quality. Its chemical formula is H3O40PW12, melting point is 89°C, and CAS No. is 12067-99-1. It is slight weathering, soluble in alcohol, ether and water, and dissolved in about 0.5 parts water. Phosphotungstic acid can be applied as multidingal new type catalyst of high catalytic property, and even can be used as a phase transfer catalyst. It is a type of green catalyst that is stable and is…

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Ferrous Tungstate 295

Ferrous tungstate is a kind of tungstate, which can be made by hydrothermal method. It is commonly applied in dingal materials. And it can also be used in the preparation of dyes, pigments, catalysts, preservatives, fireproofing agents and ceramic materials. Other common seen tungstates include calcium tungstate (CaWO4), zinc tungstate (5ZnO • 12WO3), cobalt tungstate (CoWO4), cadmium tungstate (CdWO4) and ammonium tungstate [(NH4) 6W7O24 • 6H2O]. The chemical formula of ferrous tungstate is FeWO4, the molecular weight is 303.6826g/mol, the…

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Yellow Tungstic Acid 609

Yellow tungstic acid is the most common seen tungstic acid that appears as a kind of light yellow powder or crystalline with a melting point of 1473°C. It can not easily dissolve in phosphorus acid when it is fresh produced. It is insoluble in water. And it will be colloidizing after dipping so that it is soluble in ammonia solution, alkali solution and high concentrate hydrochloric acid. Its content will be different along with the changes of producing conditions. When…

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White Tungstic Acid 697

White tungstic acid is one of different types of tungstic acid, showing the appearance of white crystalline powder. It is less active than microcrystalline structure white tungstic acid. However, it is active, optical sensitive and can be easy reduced. Its chemical formula is mWO3•nH2O. There is powder and colloform, and the latter is difficult to be prepared. Producing Methods 1. Can be produced by adding dilute nitric acid into sodium tungstate solution. 2. Decompose peroxide tungstate solution by nitric acid.…

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Tungstic Acid 603

Tungstic acid is a kind of yellow powder with the relative density of 5.5. It refers to hydrated forms of tungsten trioxide (WO3). The simplest form, the monohydrate, is WO3•H2O, the dihydrate WO3•2H2O is also known. Its boiling point is 1473°C. It is slightly soluble in hot water, slowly soluble in caustic alkali, and soluble in hydrofluoric acid (HF) and ammonia. While it is almost insoluble in acid, except HF. Tungstic acid can exist in a variety of states, including…

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Calcium Tungstate 341

Calcium tungstate is a white crystalline with tetragonal system. It decomposes in hot hydrochloric acid. Also, it is slightly soluble in water and ammonium chloride solution. Its relative density is 6.062g/cm3, chemical formula is CaWO4, where W has a valence of +6. Producing Processes 1. Processed from natural scheelite. 2. Adopt tungsten trioxide and calcium carbonate as raw materials, and burn at the temperature of 1070°C. 3. Made by the reaction of calcium oxide/calcium hydroxide and tungsten oxide/tungsten hydroxide in…

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Sodium Tungstate 393

Sodium tungstate is a kind of white shiny crystalline or crystalline powder, whose chemical formula is Na2WO4. It is weathered in the air. Also, it is insoluble in ethanol, slightly soluble in ammonia, and soluble in water, which is slight alkalinity. It is also known for its anti-diabetic effects. Sodium tungstate is prepared from tungsten ores used to manufacture tungsten by reducing it. It is used as catalyst for epoxidation of alkenes and oxidation of alcohols into aldehydes or ketones…

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Metatungstic Acid 592

Metatungstic acid is a highly soluble and colorless crystal with a density of 3.93g/cm3. It is a kind of polytungstic acid with the formula H6 [H2 (W3O10) 4] • nH2O, in which n is 10 or 23. It decomposes at 50°C. Its solubility is 88.57g/100cm3 (in water, at the temperature of 25°C). Metatungstic acid can be made from the salt of metatungstic acid (metatungstate). Metoplutamate is an important industrial product developed in the late 1970s. It is mainly used as…

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Ammonium Tungstate 324

Ammonium tungstate is a kind of white rhombic crystal, which is soluble in water and insoluble in ethanol. Its chemical formula is (NH4)10W12O41~xH2O. And It loses four molecular of crystal water at the temperature of 100℃. At the temperature of 20°C, its solubility in water is less than 2%. Ammonium tungstate is one of tungsten compounds and is an important intermediate material for tungsten metallurgy industry. It is an important raw material for producing ammonium paratungstate, ammonium metatungstate and phosphorus…

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