
The removal of molybdenum (Mo) impurities from sodium tungstate (Na?WO?) is a critical step in the purification process of tungsten chemicals, especially for producing high-purity tungsten products or intermediates such as APT (Ammonium Paratungstate) and AMT (Ammonium Metatungstate). Since both molybdenum and tungsten belong to Group VI B of the periodic table and exhibit similar chemical properties, their separation is particularly challenging. Below are commonly used methods and the principles behind them: I. Forms of Molybdenum Impurities In alkaline conditions,…