| 摘要 |
A process for the extraction of Co (III) from ammoniacal solutions comprising Co (III) and Ni (II). The process comprises: (a) contacting said ammoniacal solution with (b) bis (2,4,4-trimethylpentyl)phosphinic acid or an ammonium or alkali metal salt thereof, said ammoniacal solution forming the aqueous phase and said phosphinic acid, or salt thereof, forming the organic phase, and (c) a phase modifier whereby the Co (III) values are extracted from said aqueous phase to said organic phase.
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