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VTO 321

VTO is the short for violet tungsten oxide, also known as γ-tungsten oxide. It is a kind of violet or blue-violet crushed crystalline powder that is soluble in ammonia water and alkali solution. And it is insoluble in alcohol, water and most of acid. Its chemical formula is WO2.72 or W18O49 with the molecular weight of 227.36. Producing Method Violet tungsten oxide is manufactured under a certain reduction condition from the raw materials of ammonium paratungstate (APT), tungstic acid or…

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YTO 382

YTO, the abbreviation of yellow tungsten oxide, also called tungsten trioxide (WO3), is a yellow or bright green powder with the formula WO3-x, loose specific weight of 2.3~2.8g/cm3. The property of yellow tungsten oxide is stable at room temperature. Grades According to national standards, tungsten trioxide is usually divided into three grades, namely super grade (WO3-0), grade 1(WO3-1) and grade 2 (WO3-2). In addition, each manufacturer will produce yellow tungsten oxide with different specification because of the difference of raw…

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BTO 323

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 361

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 309

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 662

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 740

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 639

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 381

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 434

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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