Crystalline blue tungsten oxide is a blue powder with coarser grain size.
Ion Exchange Method to Produce Blue Tungsten Oxide
This method has been widely used in factory. Ion exchange method to produce blue tungsten oxide has the following process: grinding, leaching, ion exchange, ammonium paratungstate crystallization, drying and calcination.
Principle of Blue Tungsten Oxide Prepared by Ion Exchange Method
In the aqueous solution of tungsten, different kinds of anions have different affinity for the exchange resin, and the one with bigger affinity will exchange the smaller one. With the ongoing of exchange process, other anions are gradually substituted by tungsten and purified, especially for element like Si, P, As.
Ion exchange method is an economic method to produce blue tungsten oxide. It is developed in recent years for tungsten hydrometallurgical technology. With update and improvement of extracting equipment of tungsten, tungsten product manufacture has been improved a lot.
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