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Process of recovery of metals from aqueous ammoniacal solutions employing an ammonia antagonist having only hydrogen bond acceptor properties
Process of recovery of metals from aqueous ammoniacal solutions employing an ammonia antagonist having only hydrogen bond acceptor properties
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机译:使用仅具有氢键受体特性的氨拮抗剂从氨水溶液中回收金属的方法
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摘要
An improved process for the extraction of a metal from an aqueous ammoniacal solution comprising:;(i) contacting the aqueous ammoniacal solution with an extraction reagent comprised of a water insoluble extractant for the metal, to provide an organic phase, now containing metal values, and an aqueous phase from which metal values have been extracted;;(ii) contacting the organic phase with an aqueous stripping solution to provide an aqueous strip phase, now containing metal values, and an organic phase from which metal values have been stripped; and;(iii) recovering the metal values from the aqueous stripping solution;;the improvement wherein (a) the extraction reagent contains an ammonia antagonist having only hydrogen bond acceptor properties; (b) the stripping solution is an aqueous highly acidic solution; and (c) the organic phase is washed with a weakly acidic aqueous solution prior to stripping with the highly acidic aqueous stripping solution. The extractant is preferably an oxime extractant, either a ketoxime or an aldoxime. The preferred hydrocarbon solvent is kerosene and the preferred antagonist is 2,2,4-trimethylpentane-1,3-diol diisobutyrate.
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