China's tungsten resources are very rich and reserves always rank first in the world. But through many years of exploitation and lack of protection of the tungsten resources, serious damage and huge waste of tungsten resources are caused. Because the new resources fail to timely supply, tungsten resources available for exploitation are sharply reducing. Tungsten resources in China are facing a severe situation. Therefore, recycling tungsten increasingly brings to the attention of the people. Some experts have studied the recovery of tungsten in APT crystal mother liquor.

 

Early use resin D296 to recycle tungsten in acid liquid. Use NaOH to desorb and enrich tungsten. Then Convert D354 ion exchange resin, with ammonia desorption agent. At this point, the resin exchange capacity increases and the desorption rate enhances. At the same time, use iron sulfide to remove molybdenum. Therefore, recycling ammonium tungstate can be conventional evaporated and crystallized to produce APT with less molybdenum. 

 

This paper studies the best conditions of producing sodium tungstate of mother liquor by D354 resin absorption without removing molybdenum and NaOH desorption, evaporation and crystallization. The results show that D354 ion exchange resin has high capacity and easy desorption. This process has the advantages of short process, less investment, easy mastery and good working conditions. 

 

The method of using ion exchange method to recycle sodium tungstate   from APT crystal mother liquor is divided into the following steps:

1. The mother liquor is from the production workshop. Tungsten trioxide is 10.58 g/L, pH = 6.