Precipitate H2WO4 from Na2WO4 solution, fully wash with water to remove Na, and then extract with ammonia water. The reaction formula is as follows: Na2WO4+HCl→2NaCl+H2WO4
12H2WO4+1ONH4OH→ 5(NH4)2O•12WO3•5H2O+12H2O
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