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The extraction of indium(III) from acidic sulphuric solution by the ionic liquid (PJMTH+HSO4−) was investigated. This ionic liquid was generated by reaction of the primary amine Primene JMT (PJMT) and sulphuric acid solutions. The metal extraction was investigated under various experimental conditions: equilibration time, temperature, metal and sulphuric acid concentrations in the aqueous feed and extractant concentration in the organic solution. Also, the selectivity of the present system against the presence of other metals in the aqueous feed was examined. Indium stripping is effectively done by the use of sulphuric acid solution. Extraction and stripping isotherms were generated within this work.

Indium(III) is extracted from HCl solutions (0.1–6 M HCl) by the ionic liquid (A324H)(Cl). The ionic liquid was generated in a previous reaction of the tertiary amine Hostarex A324 (triisooctyl amine) dissolved in Solvesso 100 with 1 M HCl solution. The metal extraction was investigated under various experimentalconditions: equilibration time, temperature, metal and HClconcentrations in the aqueous solution and ionic liquid concentration in the organic solution. Experimental results suggested that the indium extraction is due to an anionic exchange reaction between the chloride ion of the ionic liquid and the InCl of the aqueous solution. The performance of the system was compared against the extraction of other metals in binary solution (indium and accompanying metal) and against other ionic liquids. Indium(III) was stripped from metal-loaded organic solutions by the use of diluted hydrochloric acid solutions, and the precipitation of zero valent indium is possible by a further addition of sodium borohydride to the In-bearing strip solution.

The processing of indium(III)-hydrochloric acid solutions by the cationic ion exchange Lewatit K-2621 resin has been investigated. The influence of several variables such as the hydrochloric acid and metal concentrations in the aqueous solution and the variation of the amount of resin added has been studied. Moreover, a kinetic study performed in the uptake of indium(III) by Lewatit K-2621, shows that either the film-diffusion and the particle-diffusion models fit the ion exchange process onto the resin, depending upon the initial metal concentration in the aqueous solution. The loaded resin could be eluted by HCl solutions at 20 °C. Copyright: © 2014 CSIC.