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Indium Extraction from Sulfate Solutions with a Mixture of Di(2-Ethylhexyl)Phosphoric Acid and Octyl Alcohol

2022; RELX Group (Netherlands); Linguagem: Inglês

10.2139/ssrn.4184680

1556-5068

I. Yu. Fleitlikh, N. A. Grigorieva, Alexey Tikhonov, Vyacheslav I. Krasnov, Е. В. Карпова, O. A. Logutenkо,

Extraction and Separation Processes

In this work, solvent extraction of In(III) from sulfate solutions by using mixtures of D2EHPA with octyl alcohol and octanoic acid was investigated. The introduction of the additives into the organic phase was shown to lead to an antagonistic effect, i.e. to a decrease in the extraction efficiency, thus facilitating efficient indium stripping from the loaded organic phase. The antagonistic effect is significantly higher in the D2EHPA (HR) and octyl alcohol (HA) mixtures. The low activity of octanoic acid can be attributed to its tendency to self-association, which largely prevents the formation of intermolecular associates between D2EHPA and monocarboxylic acid. The formation of stable associates between D2EHPA and HA leads to a decrease in the extraction efficiency of indium.Based on the analysis of the extraction data and by using nuclear magnetic resonance (NMR) and infrared (IR) spectroscopy of the organic phases, it was concluded that indium extraction with D2EHPA in octyl alcohol is due to the formation of the extracted compound InR3. Extraction systems containing D2EHPA and octyl alcohol can be used to recover indium from various industrial solutions, in particular from the solutions derived from lead-zinc production and from liquid crystal display panel wastes.