In this work, the aqueous phase diagram for the mixture of the hydrophilic tributyltetradecyl phosphonium ([P44414]Cl) ionic liquid with acetic acid (CH3COOH) is determined, and the temperature dependency of the biphasic region established. Molecular dynamic simulations of the [P44414]Cl + CH3COOH + H2O system indicate that the occurrence of a closed “type 0” biphasic regime is due to a “washing-out” phenomenon upon addition of water, resulting in solvophobic segregation of the [P44414]Cl. The solubility of various metal oxides in the anhydrous [P44414]Cl + CH3COOH system was determined, with the system presenting a good selectivity for CoO. Integration of the separation step was demonstrated through the addition of water, yielding a biphasic regime. Finally, the [P44414]Cl + CH3COOH system was applied to the treatment of real waste, NiMH battery black mass, being shown that it allows an efficient separation of Co(II) from Ni(II), Fe(III) and the lanthanides in a single leaching and separation step.

中文翻译：

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使用有机酸和离子液体的混合物集成浸出和分离金属


在这项工作中，确定了亲水性三丁基十四烷基鏻 ([P44414]Cl) 离子液体与乙酸 (CH3COOH) 混合物的水相图，并建立了双相区域的温度依赖性。 [P44414]Cl + CH3COOH + H2O 体系的分子动力学模拟表明，封闭“0 型”双相状态的发生是由于加水时的“冲洗”现象，导致 [P44414] 的疏溶剂分离。 ]Cl。测定了各种金属氧化物在无水[P44414]Cl + CH3COOH体系中的溶解度，该体系对CoO表现出良好的选择性。通过添加水证明分离步骤的整合，产生双相状态。最后，[P44414]Cl + CH3COOH 系统应用于处理真正的废物、镍氢电池黑料，结果表明它可以有效地将 Co(II) 与 Ni(II)、Fe(III) 和镧系元素分离在单个浸出和分离步骤中。