Tungsten Trioxide Introduction 1/3

Tungsten trioxide is yellow powder. It dissolves in water, soluble in alkali; slightly dissolves acid .It is used to make refractory alloys and tungsten carbide, tungsten and fire system materials. Tungsten ore and soda ash by eutectic after adding acid derived. It depends on the structure of the tungsten trioxide temperature: 740 ° C above it is tetragonal; 330-740 ° C is orthorhombic; 17-330 ° C is monoclinic; -50-17 ° C for the three triclinic. Tungsten trioxide is mainly used in the production of tungsten reduction calcined powder and tungsten carbide powder, and then used to produce carbide products, such as tool and die manufacturing. Tungsten concentrate with sodium hydroxide or soda from the melt temperature, or high pressure sodium tungstate solution prepared boiled, and then purified by ion exchange or extraction, evaporation process to obtain ammonium paratungstate crystals, and then calcined at 700 ℃ to obtain tungsten trioxide.
Chinese name: tungsten trioxide
Chinese alias: tungsten anhydride; tungsten oxide (VI)
English name: Tungsten trioxide
 

Tungsten Trioxide - Physical and Chemical Properties
Physical Properties

Tungsten Trioxide Structure

Tungsten Trioxide Structural Formula
Melting point (℃): 1472
Relative density (water = 1): 7.16
Boiling point (℃): 1837
Formula: WO3
Molecular Weight: 231.85
Solubility: insoluble in water, soluble in alkali, slightly soluble in acid

Chemical Properties
Significant sublimation at 850 ℃; hardly inorganic acid except hydrofluoric acid and can slowly dissolve in ammonia or concentrated alkali solution. Heating the reaction of chlorine and chlorine oxides, but not reacted with bromine, iodine. Structure depends on the temperature of tungsten trioxide: it is more than 740 ° C for the tetragonal, 330-740 ° C orthorhombic, 17-330 ° C for the monoclinic system, -50-17 ° C for the three triclinic. The most common structures monoclinic, space group P21 / n.

Tungsten Trioxide - Specifications

 
Tungsten Trioxide Specifications

Tungsten Trioxide - the Role and Purpose
Tungsten trioxide is mainly used in the production of tungsten reduction calcined powder and tungsten carbide powder, and then used to produce carbide products, such as tool and die manufacturing. But also it can be used in the manufacture of pure tungsten products, tungsten, tungsten, tungsten electrode; and uses a counterweight and radiation shielding materials. Industrial production is also a small amount of yellow ceramics used as a coloring agent. Shipbuilding industry, tungsten oxide, tungsten is used as an important anti-corrosion paint and coatings materials.

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