Separation of Indium from Acid Sulfate‐Containing Solutions by Ion Exchange with Impregnated Resins

Abstract

Indium separation using ion exchange resins from acidic polymetallic and very diluted solutions are investigated. Since the selectivity of commercial ion exchange resins have proven to be too low for an effective separation from solutions with high content of other metals, Lewatit® TP 208 was impregnated with common extractants to enhance its properties. By resin impregnation with D2EHPA and Cyanex 272, not only the selective indium recovery was reached but also the resin capacity was increased approx. two times. The best loading and elution performance were shown by Cyanex 272‐impregnated Lewatit® TP 208, increasing the indium purity in the eluate from 0.75 % to 85 %.

The Pseudo-Protic Ionic Liquids TOAH⁺Cl^- and TODAH⁺Cl^- as Carriers for Facilitated Transport of In(III) from HCl Solutions

“…In a 7 M HCL medium the predominant indium(III) species was InCl4 - [22], thus, the transport of the metal can be represented by the next reaction: (12) being in this case, representative of an anion exchange mechanism, and the corresponding extraction constant as:…”

“…Best results are obtained with Lewatit VP OC 1026, a D2EHPA impregnated resin, and the corresponding metal elution is carried out with HCl solutions. Lewatit TP 208 was impregnated with different extractants to enhance its properties in the removal of indium from diluted solutions [12]. The impregnation of the resin with D2EHPA and Cyanex 272 (organic alkyl fosfinic acid derivative), not only improves the selective indium recovery but also the resin capacity was increased approximately two times.…”

Preparation of a Novel Sorbent Based on Pickering Emulsions Polymerization Method for Encapsulating Extractants and the Adsorption of Indium in an Aqueous Solution

“…[ 13 ] Bis(2‐ethylhexyl) phosphate (D2EHPA) and bis(2,4,4‐trimethylpentyl) phosphonic acid (Cyanex 272) impregnated resins were used for the recovery of indium from water. [ 14 ] It not only achieved the selective recovery of indium but also increased the adsorption capacity of the resin by a factor of two. However, the cyclic regeneration ability of SIRs was not satisfactory.…”

The Pseudo-Protic Ionic Liquids TOAH+Cl− and TODAH+Cl− as Carriers for Facilitated Transport of In(III) from HCl Solutions

“…Best results are obtained with Lewatit VP OC 1026, a D2EHPA impregnated resin, and the corresponding metal elution is carried out with HCl solutions. Lewatit TP 208 was impregnated with different extractants to enhance its properties in the removal of indium from diluted solutions [ 13 ]. The impregnation of the resin with D2EHPA and Cyanex 272 (organic alkyl phosphinic acid derivative) not only improves the selective indium recovery; additionally, the resin capacity was approximately doubled.…”