Ammonium Paratungstate
Ammonium Paratungstate(APT) is an important raw material product in tungsten smelting process, the appearance is white crystalline.
It is mainly used for the reduction of tungsten oxide or ammonium metatungstate, and also used as catalysts or additives in chemical industry.
The tungsten concentrate is screened and pressed, ammonium tungstate solution was prepared by ion exchange or extraction process, after the crystallization process, ammonium paratungstate was obtained.
In the process of smelting, ammonium paratungstate solution (Na2WO4) was obtained from tungsten concentrate by ion exchange or extraction, in order to truly use ammonium paratungstate, an important process is needed: crystallization process.
The crystallization process of ammonium paratungstate is one of the important processes in the tungsten smelting process, the crystallization methods of APT in industry mainly include evaporation crystallization method, neutralization crystallization method and freezing crystallization method. Evaporation crystallization is the most widely used method in China. The process and equipment are simple and easy to be large-scale. At the same time, it has the function of purification of tungsten, and the efficiency is the best.
Ammonium paratungstate is one of the main products of tungsten export in China. However, the added value of raw materials such as ammonium paratungstate is low, it has low profit, therefore, the export amount of ammonium paratungstate is also decreasing year by year in China.
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