In theory, high purity blue tungsten oxide (BTO) refers to the β-tungsten oxide with a very high purity of 99.99% and above. The quality of tungsten products is getting more and more attention with the constant rise of high and new technology. According to the tungsten products on the performance of genetic, high purity of blue tungsten oxide will directly contribute to the high purity requirements of downstream products.
The industrial blue tungsten oxide mainly consists of several tungsten oxides of WO2.9, WO3 and WO2.72. The proportion of various components mainly depends on temperature, atmosphere, and speed of APT calcining or reduction.
High purity BTO can be prepared by ion exchange process, whose process includes ore grinding, leaching, ion exchange, ammonium paratungstate crystallization, drying, calcination and other processes. The process and relative equipment have been applied in the production.
The ion exchange method is a relatively economical process developed by the hydrometallurgical technology of tungsten in recent years. With the replacement and improvement of different levels of equipment for extracting tungsten, the production of tungsten products has been promoted.
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