Dissolve Tungsten Scraps to Recover Ammonium Paratungstate

Ammonium paratungstate (APT) and tungsten trioxide scraps, as well as substandard products such as tungsten powder and carbide scraps will produce in the smelting process. At present, there are two main ways to deal with these substandard products:
1. Add unqualified products into tungsten products processing as a crystal seed in order to reduce costs and improve the recovery rate of tungsten smelting. Although this process can deal with the substandard products without increasing cost, but it will affect the quality of tungsten powder and carbide;
2. The method that directly dissolve substandard products into alkali to get sodium tungstate solution, and then returned to the production of APT will cost much.



A method that can effectively dissolve APT is proposed in this paper. Mix APT with ammonia, then stir and heat, to effectively get APT reacted with ammonia and generates ammonium tungstate solution.

The specific steps are as follows:
1. Mix APT with ammonia to get the mixture;
2. Make APT dissolved in ammonia, and the tungstate solution;
3. Evaporate and crystallize the tungstate solution to generate APT qualified.

Advantages:
1. recycling tungsten in smelting process at low cost, further improve the recovery rate, reduce energy consumption, and provides a foundation for new technology and product research of tungsten smelting;
2. Shorten the process, increasing the efficiency, and simplify the equipment and operation;
3. Achieve the goal of clean production in tungsten smelting to make tungsten smelting site easier to manage and cleaner.

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