The electrochemistry of gold in acid aqueous solutions containing chloride ions

Gallego, J Herrera

doi:10.1016/0368-1874(75)85218-x

Cited by 5 publications

(3 citation statements)

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“…Metallic gold is deposited from chloride solutions containing Au 3ϩ in two steps: Reduction of Au 3ϩ to Au ϩ , which is rate-determining, followed by a much faster reduction of Au ϩ to Au 0 (Herrera Gallego et al 1975;Schalch et al 1976). Thus, formation of Au 0 actually occurs from a Au ϩ complex.…”

Section: Introductionmentioning

confidence: 99%

Invisible gold; comparison of Au deposition on pyrite and arsenopyrite

Maddox

Bancroft²,

Scaini³

et al. 1998

American Mineralogist

112

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X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FESEM), and open circuit potentials were used to compare the size, chemical state, and distribution of adsorbed and reduced gold from Au 3ϩ chloride solution on pyrite and arsenopyrite. Many small Au 0 particles grow on the arsenopyrite surface, whereas few, much larger, gold particles appear on pyrite. These results mimic the differences in distribution of gold in some coexisting natural pyrites and arsenopyrites. The rate-limiting step in deposition of gold from Au 3ϩ chloride solutions is the reduction of Au 3ϩ to Au ϩ , whereas the open-circuit potential for deposition is determined by the reduction of Au ϩ to Au 0. The open-circuit potential of pyrite or arsenopyrite is a corrosion potential. Presence of Au 3ϩ shifts the corrosion potential to a value that depends on the relative rates of the reduction of Au 3ϩ and the oxidation of the mineral. Open-circuit potential measurements indicate that the rate of deposition of gold on pyrite is controlled almost entirely by the rate of reduction of Au 3ϩ. By contrast, the rate of reduction of gold on arsenopyrite is controlled significantly by the rate of oxidation of arsenopyrite.

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Section: Introductionmentioning

confidence: 99%

Invisible gold; comparison of Au deposition on pyrite and arsenopyrite

Maddox

Bancroft²,

Scaini³

et al. 1998

American Mineralogist

112

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“…At low pH (< 4) the chlorocomplexes of gold are stables [44]. The addition of ammonium hydroxide (0.2M) in the HAuCl 4 solution and the consequent raise of pH up to 10.0 (conditions used in this work) led to the formation of complexes of gold with ammonium [Au(NH 3 ) 4 ] +3 and Au(NH 3 ) + [45].…”

Section: Goldmentioning

confidence: 94%

Electrochemical study of gold recovery from ammoniacal thiosulfate, simulating the PCBs leaching of mobile phones

Kasper

Veit

García-Gabaldón

et al. 2018

Electrochimica Acta

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The high volume of sales and the high degree of obsolescence of mobile phones, together with the reduction of the natural reserves of the metals used in the composition of their printed circuit boards (PCBs), makes the recycling of these devices economically and environmentally attractive. Moreover, the search for the reduction of toxicity levels inherent to the gold leaching processes with alternatives to cyanide, such as thiosulfate is a priority. Thus, it is necessary to search for

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“…El mecanismo de reacción ha sido discutido por J. Arvia et. al 11 , concluyendo que los productos anódicos son Au(I) y Au(III) dependiendo de la concentración y potencial de oxidación empleado, el mecanismo se ve favorecido por la espontánea adsorción del ion cloruro sobre el electrodo de oro. El Eficiencia de separación de la mesa gravimétrica = 81.5 % Caracterización electroquímica -estudio de la corrosión de oro patrón y parámetros de lixiviación…”

Section: Estudio De La Lixiviación Electroquímica Del Oro En Naclunclassified

USO DE CLORO ELECTROGENERADO A PARTIR DE NaCl EN MEDIO ÁCIDO COMO UNA PROPUESTA PARA LA LIXIVIACIÓN DE ORO ALUVIAL

Aguinaga¹,

Baena-Moncada²,

Gómez³

2021

rsqp

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La electrogeneración anódica de cloro molecular, a partir de cloruro de sodio en una celda electrolítica, permite la producción de ácido hipocloroso en medio acuoso. Esta mezcla de cloruro y ácido hipocloroso actúa como lixiviante del oro aluvial hasta sus formas complejas, [AuCl2]-, [AuCl4]-. Las cantidades óptimas para la lixiviación de oro, empleando solo NaCl acuoso en medio neutro fue de 10 g L-1, mientras que a pH 2, con una concentración fija de NaCl de 10 g L-1 la lixiviación de oro aumentó hasta en un 70,4%. El agregado de hipoclorito de sodio a una solución de cloruro de sodio a pH 2 demuestra que es el producto oxidado del cloruro el que cumple la función de oxidante y puede ser empleado exitosamente para recuperar oro de las arenas aluviales sin el empleo de mercurio.

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The electrochemistry of gold in acid aqueous solutions containing chloride ions

Cited by 5 publications

References 0 publications

Invisible gold; comparison of Au deposition on pyrite and arsenopyrite

Invisible gold; comparison of Au deposition on pyrite and arsenopyrite

Electrochemical study of gold recovery from ammoniacal thiosulfate, simulating the PCBs leaching of mobile phones

USO DE CLORO ELECTROGENERADO A PARTIR DE NaCl EN MEDIO ÁCIDO COMO UNA PROPUESTA PARA LA LIXIVIACIÓN DE ORO ALUVIAL

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