tungstic acid oor Koreaans
tungstic acid
en
(chemistry) the solid hydrated form of tungsten oxide, H <sub>2</sub> WO <sub>4</sub> ; used in textiles, and in yellow glazes
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chemical compound
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Liquid ammonia reacts with tungstic acid can get anhydrous ammonium tungstate.
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Ammonium Paratungstate is used as a laboratory reagent or as a source for high-purity tungstic acid, tungsten metal powder, or carbide.
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Research indicates that an aqueous solution of inorganic acid and alkali metal tungstate can obtain tungstic acid. Chemical Reaction of Sodium Tungstate and Hydrochloric Acid
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All other intermediates such as tungsten trioxide, tungsten blue oxide, tungstic acid and ammonium metatungstate can be derived from APT, either by thermal decomposition or chemical conversion.
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Tungstic acid the most important intermediate in former tungsten chemistry, is today exclusively manufactured out of APT, in order to make use of the high pirity APT level.
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APT is the most important precursor of tungsten products, which can be used for the preparation of tungsten trioxide, blue tungsten oxide, tungstic acid, ammonium paratungstate and other products.
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It is produced by evaporate tungstic acid soluble in ammonium solution, has the shape of needle and flake, insoluble in water, soluble in boiled water, lose crystal water in dry air, add in overdosed hydrochloric acid or nitric acid will separate out tungstic acid.
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Sodium tungstate is the raw material of manufacturing metal tungsten, tungstic acid and tungstate salts; also used as a mordant, catalyst and pigments, as well as fabric fire retardant and chemical analysis reagents ect.; also, it is widely used in industries of petroleum, aerospace and defense.
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In addition, tungsten oxide produced by hydrothermal crystallization method from tungstic acid has the quadrature and hexagonal phase, the oxygen index is 2.50 and the photocatalytic water splitting performance has been greatly improved, wherein the product of 24 hours hydrothermal has the highest rate of oxygen evolution.
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Metatungstate ion is stable in weak acid solution of PH value equals to 4; while, decomposition of it will be carried out when adding alkali or getting boiling and to generate positive tungstate. Once the metatungstate ion is formed in the aqueous solution, it can not precipitate tungstic acid even add the acid, while adding calcium chloride (CaCl2 ) will not suppose to precipitate the scheelite.
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Difference on production: The biggest difference of production between ammonium metatungstate and ammonium paratungstate is that APT is raw material of AMT, and thermal degradation of APT to generate AMT is a typical process of the solid phase transformation. Difference on application: Ammonium metatungstate used for preparing tungsten metal powder, alloy steel and tungsten compounds, while also used in the nuclear shielding materials and corrosion inhibitor; Ammonium paratungstate is mainly for the manufacture of or tungsten trioxide or blue tungsten oxide, thus to prepare metal tungsten powder; and used as a laboratory reagent for preparing high purity tungstic acid, tungsten metal powder or tungsten carbide, and water-absorbing gel ect..
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