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Abstract

Elution of copper from chelating anion exchange resins wherein the first volumes of eluate obtained have very low copper contents. The elution is conducted in an elution cycle which is applied to successive loaded batches of resin. In each cycle the loaded resin is pre-treated with a low grade copper tertiary solution obtained as a process effluent from a preceding cycle. Copper from a tertiary solution becomes loaded onto the resin. The resin is then contacted with a secondary eluant, also obtained as an effluent from a preceding cycle. The first fraction of effluent is stored for use as the tertiary solution in the next cycle and the second fraction is recovered as concentrated eluate. The resin is then contacted with a primary eluant. The first fraction of effluent is recovered as concentrated eluate and the second fraction is stored for use as secondary eluant in the next cycle.

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