versão ISSN 0718-0764
CHAPARRO, Miriam E; VALENZUELA, Jesús L; MUNIVE, Guillermo T e PARGA, José R. Use of Anion Exchange Resin for the Recovery of the Complex Gold Thiosulfate from Aqueous Solutions. Inf. tecnol. [online]. 2012, vol.23, n.2, pp. 53-60. ISSN 0718-0764. doi: 10.4067/S0718-07642012000200007.
The adsorption and elution of gold in thiosulfate-ammonia media were studied using the resin AuRIX®100, evaluating some variables that affect the kinetico of the process, such as: temperature, stirring speed, pH, thiosulfate concentration (NH4)2S2O3 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 opeed=500 rpm, [Au]=1 mg/l, [(NH4)2S2O3]=0.04 M, and 5 gramo of resin. The results indicate that by increasing [(NH4)2S2O3] 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.
Palavras-chave : gold adsorption; thiosulfate; AuRIX®100 resin; kinetics.