Blue Tungsten Oxide Preparation -- APT Autoreduction Method
Blue tungsten oxide is one of the important raw materials for making tungsten powder. As an important intermediate of tungsten in modern industry, it has been popular for many years. The commom methods of preparing blue tungsten oxide are APT closed calcination method and hydrogen mild reduction method etc. Although they have been popularized for many years, they have more or less some environmental safety factors. As a result, people have never abandoned the quest for a more effective and environmentally friendly method for producing blue tungsten oxide. APT autoreduction method is an upgraded version of the APT hydrogen mild reduction method. What's different between them is that the APT autoreduction method does not add hydrogen or ammonia into the reacting furnace, instead, the heating temperature is increased to 600°C -800°C. APT decomposes hydrogen under high temperature....