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.
Bibliographical noteFunding Information:
The authors gratefully acknowledge the Korea Institute of Energy Technology Evaluation and Planning for the financial support toward this study.
Copyright 2014 Elsevier B.V., All rights reserved.
- Dowex 21K XLT resin
- Gold-cyanide complex
ASJC Scopus subject areas
- General Chemical Engineering