The solvent extraction method combines ammonium tungstate solution with organic extractants such as di (2-ethylhexyl) phosphate (D2EHPA) or tributyl phosphate (TBP) and kerosene solvent to form an organic phase. The ammonium ions in ammonium tungstate are extracted to reduce the pH value to 2-4, and the solution is digested to form ammonium metatungstate solution. Concentrate crystallization, filter separation, and dry to obtain products.
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