Producción Científica Profesorado

Electrochemical recovery of silver from cyanide leaching solutions



Reyes Cruz, Victor Esteban

2002

1.V. Reyes Cruz, M. T. Oropeza, I. González and C. Ponce de León, ?Electrochemical recovery of silver from cyanide leaching solutions?, J. Appl. Electrochem., 32 (2002) 473


Abstract


In the hydrometallurgy industry cyanide solutions are the most common leaching baths used during the extraction of metals such as silver and gold. After extraction, the solution containing various cyanide species, and usually copper cyanide, has a higher concentration than the gold and silver complexes. Higher concentration of copper species may interfere during the selective recovery of precious metals. This work presents a study of the selective recovery of silver from leaching solutions mimicking those used in industry. Chemical speciation and cyclic voltammetry studies showed that copper reduction occurs at more negative potentials than silver in the cyanide leaching solutions. The cyclic voltammetry of cyanide solutions on a vitreous carbon electrode showed that copper cyanide ions modify the interface properties, lowering the overpotential required for silver reduction. A macroelectrolysis study of a simulated leaching solution (10?4 M Ag(I), 0.1 M Cu(I) in 0.5 M CN? at pH 10), was carried out in a filter press electrochemical reactor (ElectroCell AB) with a reticulated vitreous carbon electrode (RVC), nominally having 45 pores per inch and a flow rate of 5 cm3 s?1 at 25 C. The study showed that the high copper concentration does not interfere in the selective deposition of silver.



Producto de Investigación




Artículos relacionados

Estudio electroquímico para la purificación del caolín proveniente de Agua Blanca de Iturbide, Hidal...

Electrorremediación de suelos arenosos contaminados por Pb, Cd y As provenientes de residuos mineros...

Influencia del área, el potencial y la velocidad lineal de flujo en la recuperación selectiva de Dor...

Caracterización electroquímica de los jales históricos del distrito minero de Zimapán

Corrosion of carbon steel in a buffered solution like NACE TM 0177 in the presence of hydrocarbon

Analysis of the electrochemical reactivity of natural hemozoin and ?-hemozoin in the presence of ant...

Simulación matemática la ley de Darcy en celda de electroremediación de suelos

Efecto del pH sin agitación, en acero al carbono AISI 1018, en aguas amargas de la industria del pet...

ESTUDIO COMPARATIVO Y CARACTERIZACIÓN DE CAOLINES COMERCIALES DISPONIBLES EN LA ZONA DE PACHUCA, HID...

Evaluación de la resistencia a la corrosión de aceros Pulvimetalurgicos inoxidables austéniticos sin...