Removing of Stannum in Producting Ammonium Paratungstate

Since 1970s,Chinese tungsten metallurgy has made remarkable progress and product quality ranked high because of application of ion-exchange technology.Ammonium paratungstate quality is (affected) by stannum in solution. In recent years, some new methods about removing of stannum from tungsten are put forward. According to this status, developing trend of W-Sn separation technology in our country is analyzed.

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