Abstract
The recovery of the tetrachloroaurate complex by the anionic ion exchange resin Dowex 11 has been studied. The kinetics of gold adsorption were dependent of both gold and resin concentrations and temperature. The adsorption isotherm can be described by the expression Q = kCn. The loaded resin could be eluted by an acidic thiourea solution at 20°C. After several adsorption-elution cycles there is not any apparent loss in the adsorption properties of the resin.
Highlights
The majority of gold extraction flowsheets use hydrometallurgical techniques; the most important of which are leaching, solution purification and/or concentration and recovery of gold
The use of ion exchange for the concentration and purification of gold has been investigated from years, it seems that this technology had only been favoured in the ex-USSR against the use of carbón adsorption in the Western countries
The ion exchange resin Dowex 11 (Dow Chemical) used to adsorb gold from HC1 media is a strongly basic anión exchanger containing an active group of trimethyl benzyl ammonium, it was used without any specific pretreatment
Summary
The majority of gold extraction flowsheets use hydrometallurgical techniques; the most important of which are leaching, solution purification and/or concentration and recovery of gold. Since gold is dissolved the purification and/or concentration of the pregnant solution is accomplished by one (or a combination) of these methods: carbón adsorption, ion exchange, solvent extraction, zinc cementation and electrowinning (1). The use of ion exchange for the concentration and purification of gold has been investigated from years, it seems that this technology had only been favoured in the ex-USSR against the use of carbón adsorption in the Western countries. (c) Consejo Superior de Investigaciones Científicas Licencia Creative Commons 3.0 España (by-nc) use of ion exchange resins in gold processing need to be considered (2-5). The present work investigates the possibilities of the Dowex 11 resin on the adsorption of the tetrachloroaurate ion. Results on the resin regeneration and recycling are present
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