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Adsorption by activated carbon is suitable for recovering high valuable metals such as gold (from cyanide liquors) from dilute solutions of 10 mg/L to 1 g/L range. Activated carbon is known to be less effective for adsorbing multi-charged ions such as sulphate and copper cyanide (Cu(CN)32−, Cu(CN)43−), compared to single-charged ions such as gold, silver and copper cyanide (Au(CN)2−, Ag(CN)2−, Cu(CN)2−) (Dai et al., 2010, 2012). At 2–10 g/L range, solvent extraction has been proven to be more effective. However, for Re or Mo solvent extraction, the co-transfer of nitrate, chloride and sulphate from the aqueous to the organic phase was observed in several studies (Shu and Yang, 2010 ; Xiong et al., 2008). It is important for solvent extraction circuits treating sulphate liquors using ammonia stripping solutions to minimize the transfer of sulphate into the organic phase to avoid crud formation due to ammonium sulphate build up at the aqueous/organic interphase (An et al., 2009a,b). The transfer of these anions was also found to significantly (~75%) decrease the extraction or loading of Re into the organic phase or resins. The use of activated carbon for adsorbing Re selectively from Mo–Re ammoniacal solutions of low concentrations range 1–10 mg/L each was earlier reported by Chen et al. (1993). At a range of pH 8–10, complex ammonium molybdate was left behind while rhenium could be mostly adsorbed by carbon. The study however did not address the adsorption kinetics nor the elution of Re from the activated carbon.
This study therefore investigates the use of activated carbon in recovering Re from treated stripped liquors (pH 6–8) produced from a molybdenite roaster and minimizing the uptaking of Mo from the scrubbing liquors. The study evaluates the different characteristics of Re and Mo adsorption using activated carbon and the parameters controlling the loading and elution processes.
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