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

Yong Sik Ok; Choong Jeon

Journal of Industrial and Engineering Chemistry, Vol.20, No.4, 1308-1312, July, 2014

DOI10.1016/j.jiec.2013.07.010 Export Citation

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

Yong Sik Ok, and Choong Jeon^{1, †}

Department of Biological Environment, Kangwon National University, Chuncheon 200-701, South Korea
¹Department of Biochemical Engineering, Gangneung-Wonju National University, Jukhen-gil 7, Gangneung-si, Gangwon-do 210-702, South Korea

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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.

Keywords:Dowex 21K XLT resin;Gold.cyanide complex;Selectivity;Adsorption;Removal

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