| 摘要 |
A process for extracting tungsten values from an aqueous phase into an organic phase, comprises (a) providing an aqueous phase containing tungsten values dissolved therein, and having an initial pH of about 2.2 to about 4.0, (b) providing an organic phase depleted in tungsten and containing a secondary amine or tertiary amine extractant, a modifier, and the balance a liquid hydrocarbon solvent, (c) extracting tungsten values from said aqueous phase into said organic phase in a plurality of extraction stages operating in countercurrent fashion, and (d) recovering the organic phase enriched in tungsten values and an aqueous raffinate having a pH of about 0.3 to about 4.5.
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