Silver Precipitation Using Sodium Dithionite in Cyanide ... - CiteSeerX

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Silver Precipitation Using Sodium Dithionite in Cyanide ... - CiteSeerX

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2 Instituto de MinerÃa, Universidad TecnolÃ³gica de la Mixteca, Carretera a Acatlima km. ... sodio, Na2S2O4), que deja un residuo de Ag dentro de los niveles.

156 J. Mex. Chem. Soc. 2012, 56(2) Article

J. Mex. Chem. Soc. 2012, 56(2), 156-162 Isauro Rivera et al. © 2012, Sociedad Química de México ISSN 1870-249X

Silver Precipitation Using Sodium Dithionite in Cyanide Media Isauro Rivera,1* Guillermo Juárez,2 Francisco Patiño,1 Iván A. Reyes,1 Antonio Roca,3 and María I. Reyes1 1

Área Académica de Ciencias de la Tierra y Materiales, Universidad Autónoma del Estado de Hidalgo, Ciudad Universitaria, Carretera Pachuca-Tulancingo km. 4.5, C.P. 42184, Pachuca Hgo. México. [email protected] 2 Instituto de Minería, Universidad Tecnológica de la Mixteca, Carretera a Acatlima km. 2.5, C.P. 69000, Huajuapan de León, Oaxaca. México. 3 Facultat de Química. Universitat de Barcelona. Martí i Franquès 1, 08028 Barcelona, Spain. Received September 12, 2011; accepted March 20, 2012 Abstract. The nature of the reaction and the main parameters affecting Ag precipitation rate in the system Ag+-CN--S2O42- are studied. From the results obtained, a process of chemical precipitation for Ag recovery is proposed, using an environmentally-friendly reducing reagent (sodium dithionite, Na2S2O4), leaving a residual content of Ag into the permitted environmental levels (