Selective adsorption of the gold-cyanide complex from waste rinse water using Dowex 21K XLT resin

초록

The Dowex 21K XLT resin which is a strong basic resin was used to selectively adsorb gold-cyanide complex only, in the actual waste rinse water which coexisted with lead-cyanide complexes. The existence of gold-cyanide complex on the surface of the Dowex 21K XLT resin was proved by SEM and EDX analysis. The maximum removal efficiency value for gold-cyanide complex was about 93% for 10 g/L of resin concentration while adsorption for lead-cyanide complexes did not almost happen at pH 13. The adsorption capacity of Dowex 21K XLT resin for gold and lead-cyanide complexes was about 32 and 0.8 mg/g-dry mass, respectively. Also, most of adsorption process for gold-cyanide complex was completed within 1 h. The exothermic nature of gold-cyanide complex adsorption onto the Dowex 21K XLT resin was revealed because the removal efficiency for gold-cyanide somewhat decreased as temperature increased. It was concluded that the Dowex 21K XLT resin, which has excellent selectivity to gold-cyanide complex, can be applied to the recovery system for gold-cyanide complex in actual waste rinse water. (C) 2013 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.

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