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An evaluation of the physicochemical degradation of gold ion-exchange resins in hypochlorite solutions

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Abstract

The long-term operating characteristics of ion-exchange resins suitable for the hydrometallurgical recovery of precious metals remain largely unknown. This study examines some physicochemical properties of two promising ion-exchange resins for gold, SR-3 and PAZ-8, when subjected to experimental conditions similar to those of a typical alkaline-chlorination gold recovery process. It is shown that the degradation behavior may be related to both the micro- and macrostructural properties of the resins. Severe resin degradation occurs on pro-longed, agitated contact of the SR-3 resin beads with hypochlorite solutions at ambient tem-perature; the low cross linkage of the resin facilitates mechanical damage, while chemical degradation occurs by dehydration, oxidative scission of the functional groups, and breakdown of the polymer matrix. The PAZ-8 resin is highly cross linked and is more resistant to both mechanical and chemical attack under similar conditions.

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Authors and Affiliations

  1. Copper Research Center, University of Arizona, 85712, Tucson, AZ

    Kathryn C. Sole (Research Associates), Peihao Qi (Research Associates) & J. Brent Hiskey (Professor of Materials Science and Engineering)

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  1. Kathryn C. Sole
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  2. Peihao Qi
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  3. J. Brent Hiskey
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Sole, K.C., Qi, P. & Hiskey, J.B. An evaluation of the physicochemical degradation of gold ion-exchange resins in hypochlorite solutions. Metall Trans B 24, 17–25 (1993). https://doi.org/10.1007/BF02657868

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  • DOI: https://doi.org/10.1007/BF02657868

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