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surface area covered by gold tailing dumps containing 0.2–0.4 g/t gold and up to 0.7% sulphides as well as around 100 g/t uranium. During the boom in uranium prices around 2007, the re-processing of dumps at gold mines for both gold and uranium recovery became economically attractive. A number of flow sheets were developed, all of which included flotation of a sulphide concentrate followed by uranium leaching and removal via ion exchange prior to gold recovery (Fleming, Brown, and Botha, 2010; van Rensburg and Mashaba, 2016). The flotation concentrates generated through re-processing of gold dumps typically contain 100 to 900 mg/kg uranium oxide (U3O8) (van Rensburg and Mashaba, 2016; van Tonder and Kotze, 2007; Fleming, Brown, and Botha, 2010). RIP technology is often considered for the recovery of uranium from the low-grade slurries (<900 mg/L U3O8) due to the cost benefit associated with elimination of the solid/liquid separation step. In recent years a number of cases have been observed in the Mintek laboratories where unexpectedly low uranium loadings onto the resin were achieved during RIP tests. In all cases the material treated contained sulphide minerals at various concentrations (1.5% up to 35% S2-). Preliminary investigations revealed that the formation of polythionates in the sulphide-bearing pulp and their co-loading onto strong-base resin adversely influenced uranium adsorption. This paper presents three case studies where this phenomenon was observed, as well as an evaluation of the conditions conducive to polythionate formation and mitigation strategies that have been identified for preventing/minimizing the inhibition of uranium loading.

Polythionate formation during uranium recovery from sulphide flotation concentrate