In the solvent extraction of ammonium metatungstate, commonly used extractants include di(2-ethylhexyl) phosphate (D2EHPA) and tributyl phosphate (TBP). These extractants are usually mixed with kerosene or other organic solvents to form an organic phase for selective extraction of tungsten or other metal ions from the aqueous phase.
Specifically, D2EHPA (di(2-ethylhexyl) phosphate) is a commonly used acidic extractant that can form a stable complex with tungstate ions to achieve the extraction of tungsten ions. TBP (tributyl phosphate) is also a commonly used organic extractant and can be used in combination with D2EHPA in some cases to improve extraction efficiency and selectivity.
In the solvent extraction process, controlling operating conditions such as pH, temperature, extractant concentration and phase ratio (volume ratio of organic phase to aqueous phase) is crucial to achieve efficient and selective tungsten ion extraction. In addition, solvent extraction usually involves steps such as stripping, washing and solvent recovery to achieve the recycling of extractants and reduce production costs.
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