В журале Hydrometallurgy (IF 4,156) опубликована статья с участием сотрудников Института: д.х.н. А.Я. Тихонова (гнс, ЛГетС), к.х.н. В.И. Маматюка (внс, ЛМР) и к.х.н. Е.В.Карповой (снс, рук. группы ГОС)
Recovery of indium from sulfate solutions with D2EHPA in the presence of organic proton-donor additives
Highlights
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The state of D2EHPA in CCl4 in the presence of proton-donor additives HA was studied.
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interaction between D2EHPA (HR) and HA was shown to occur.
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Antagonistic extraction of indium by mixtures of D2EHPA and additives is observed.
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D2EHPA and 2-ethylhexanol system is most efficient for In extraction and stripping.
Abstract
Di(2-ethylhexyl)phosphoric acid (D2EHPA, HR) is widely used for solvent extraction of indium from acidic leaching solutions, but indium stripping from the loaded organic phase is difficult because of the high affinity of indium for the extractant. Adding proton-donor additives (HA) to the D2EHPA solution is a way to achieve high stripping efficiency for indium. In this work, monocarboxylic acids, aliphatic alcohols, and phenol derivatives were used as additives. Nuclear magnetic resonance (NMR) and infrared (IR) spectroscopy of the organic phases confirm the formation of intermolecular associates (H-complexes) between all additives and D2EHPA. In the case of alcohols and substituted phenols, the interaction of oxygen atoms of alcohols or phenols with the proton of the hydroxyl group of D2EHPA is predominant, while in the case of monocarboxylic acids, an interaction between the hydroxyl proton of the acid and the P=O group of D2EHPA mainly occurs. Despite the high In distribution ratio with D2EHPA (100−1000), in all cases investigated the introduction of additives into the organic phase led to an antagonistic extraction effect, however it facilitated efficient In stripping from the loaded organic phase. This effect depends significantly on the type and structure of the additive. Indium extraction in the presence of additives decreases in the series 4-bromophenol >4-t-butylphenol > octanol, 2-ethylhexanol >4-nitrophenol >2-nitrophenol >2,6-di-t-butylphenol, octanoic acid > Versatic 10. Extraction systems containing D2EHPA and 2-ethylhexanol can be used to recover indium from various industrial solutions, in particular, from those derived from lead‑zinc production and from liquid crystal display panel wastes.
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