Tungsten Trioxide
Tungsten trioxide (WO3) is a product of tungstate or calcining ammonium paratungstate, is an important intermediate compound of high purity tungsten.
The general appearance of yellow powder, insoluble in water, soluble in alkaline solution, slightly soluble in acid. The crystal structure of tungsten trioxide has four kinds, the crystal type: it mainly depends on the temperature at 24 °C into ammonium metatungstate, heated to 300 °C and 350 °C, transformed into amorphous material (ammonium tungsten bronze), heated to 400 °C, into six party crystal WO3, when the temperature reached 500 °C, it became triclinic WO3. When the temperature reached 750 °C, the crystal was recrystallized. Crystal is not the same, WO3 surface area and average particle size is not the same.
The basic principle of preparation of tungsten trioxide mainly has three kinds: one is composed of tungsten and soda to eutectic ammonium paratungstate, plus roasting and acid decomposition and tungsten trioxide; The two is precipitated with calcium tungstate tungstic acid and hydrochloric acid reaction, the high temperature decomposition into tungsten trioxide and tungstate water, in addition to two tungsten oxide hydrogenation reduction of tungsten trioxide. Along with the progress of the process, were also derived from two other forms of W02.90 and W2.72 (tungsten blue and violet tungsten), blue tungsten is mainly used in the manufacture of hard alloy, purple tungsten for mainly for preparing ultrafine tungsten powder.
Tungsten trioxide is a major category of China's tungsten products export trade, except for the tungsten or tungsten carbide hard alloy production reduction products, were also used in industrial chemical catalyst or catalyst, a small amount of colorant for yellow ceramic is also used in industrial production. Tungsten oxide is used as an important anticorrosive paint and coating material in shipbuilding industry.
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