Blue Tungsten Oxide Preparation -- APT Closed Calcination Method
Blue Tungsten Oxide is one of the important raw materials for making tungsten powder. Compared with yellow tungsten, blue tungsten oxide is considered to be an upgraded version of yellow tungsten oxide because of its good activity, large surface area, easy to dope and maintain original crystal shape. And it’s widely used. There are three main methods for making blue tungsten, APT closed calcination method, APT hydrogen light reduction method, intrinsic reduction method. APT closed calcination is one of the most widely used methods. APT closed calcination method is the most used to produce blue tungsten oxide production. The characteristics of APT closed calcination method is: use thermal decomposition of ammonia or a small amount of ammonia into the reducing agent, thermal decomposition temperature fluctuations in the range of 550 °C - 700 °C, high yield, stable quality, which is composed of 70%W 20 O 58 blue tungsten oxide, 30WO 3 ...