Uso de resina de intercambio aniónico para la recuperación del complejo oro tiosulfato desde soluciones acuosas

Abstract

The adsorption and elution of gold in thiosulfate-ammonia media were studied using the resin AuRIX®100, evaluating some variables that affect the kinetics of the process, such as: temperature, stirring speed, pH, thiosulfate concentration (NH 4) 2S 2O 3 and gold concentration. The study was carried out in a batch reactor and an ion exchange column. The operation conditions that presented better results of gold extraction at 25°C were: pH=10.5, stirring speed=500 rpm, [Au]=1 mg/l, [(NH 4) 2S 2O 3]=0.04 M, and 5 grams of resin. The results indicate that by increasing [(NH 4) 2S 2O 3] favors the adsorption by 99% during three hours, being noticeably affected by the presence of ammonia. The conditions with results on the column at 25°C were, pH= 10.5, [Au]=1 mg/l.