The electrochemical behaviour of galena (lead sulphide) — I. Anodic dissolution

Paul, R.L.; Nicol, M.J.; Diggle, John W.; Saunders, Andrew

doi:10.1016/0013-4686(78)80091-7

Cited by 99 publications

(33 citation statements)

References 3 publications

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“…• Solid electrodes made of the material under investigation, e.g., for the analysis of minerals with semiconducting properties, typically magnetite [98][99][100] and galena [101][102][103]. Usually, the electrodes consisted of bars of the studied material housed in a Teflon shaft.…”

Section: Preparation Of Electrodesmentioning

confidence: 99%

Electroanalytical chemistry for the analysis of solids: Characterization and classification (IUPAC Technical Report)

Doménech‐Carbó

Labuda

Scholz

2012

Pure and Applied Chemistry

155

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Solid state electroanalytical chemistry (SSEAC) deals with studies of the processes, materials, and methods specifically aimed to obtain analytical information (quantitative elemental composition, phase composition, structure information, and reactivity) on solid materials by means of electrochemical methods. The electrochemical characterization of solids is not only crucial for electrochemical applications of materials (e.g., in batteries, fuel cells, corrosion protection, electrochemical machining, etc.) but it lends itself also for providing analytical information on the structure and chemical and mineralogical composition of solid materials of all kinds such as metals and alloys, various films, conducting polymers, and materials used in nanotechnology. The present report concerns the relationships between molecular electrochemistry (i.e., solution electrochemistry) and solid state electrochemistry as applied to analysis. Special attention is focused on a critical evaluation of the different types of analytical information that are accessible by SSEAC.

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Section: Preparation Of Electrodesmentioning

confidence: 99%

Electroanalytical chemistry for the analysis of solids: Characterization and classification (IUPAC Technical Report)

Doménech‐Carbó

Labuda

Scholz

2012

Pure and Applied Chemistry

155

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“…Hence, this peak could be related to the electro-oxidation of some remaining PbS, following an electrode process only favoured when higher amount of sample was deposited. Because of the working pH value (7.0) at the electrode surface, the electrochemical reaction might correspond to the sulphide oxidation to some higher redox state of S, as Paul et al [34] have stated. In a later study, Davies et al [35] suggested that the reaction that should take place in the 2-to-7 pH range was the oxidation of galena to elemental sulphur:…”

Section: Preliminary Electrochemical Detection Of the Lead Compoundsmentioning

confidence: 95%

Suitability of the voltammetry of immobilized microparticles to detect and discriminate lead compounds in microsamples of ancient black cosmetics

Pérez-Arantegui

Cepriá

2014

Electrochimica Acta

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“…Esta reacción es termodinámicamente posible a condiciones de pH muy ácidas 10 , Del voltamperograma mostrado en la Figura 2c a E λ-= -0,8 V, la relación entre la carga anódica del proceso (E) y la carga catódica, fue Q E /Q c = 0,162, sugiriendo que además de los procesos de reducción descritos por las ecuaciones (1) y (2), se están reduciendo los protones del medio.…”

Section: Procesos De Reducción De Galenaunclassified

“…PbS → S + Pb 2+ + 2e -(4) E * = -0,077 V vs. SCE Cabe mencionar que la oxidación de sulfuros minerales requiere de altos sobrepotenciales relativos al de equilibrio 7,10,11 .…”

Section: Procesos De Oxidación De Galenaunclassified

Los electrodos de pasta de carbono en el estudio electroquímico de minerales metálicos

Nava

González

2005

Quím. Nova

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Recebido em 29/6/04; aceito em 8/11/04; publicado na web em 28/2/05 THE ROLE OF THE CARBON PASTE ELECTRODES IN THE ELECTROCHEMICAL STUDY OF METALLIC MINERALS. This paper shows the applicability of the carbon paste electrode-mineral (CPE-mineral) to study the dissolution mechanisms of minerals in powder form and in flotation concentrates. A potentiodynamic strategy to find the dissolution mechanism of galena (PbS) is presented. In this way, minerals less studied such as orpiment (As 2 S 3 ) and realgar (As 2 S 2 ) are investigated. The electrochemical activity of a more complicated mineral such as sphalerite (ZnS), containing 12.3 and 0.43% of iron in solid solution, is discussed. The mechanism of a complex zinc concentrate (containing 63.4% ZnS, 20.1% FeS 2 , 5% CuFeS 2 , 0.33% PbS, 0.45% Cu 12 Sb 4 S 13 and 0.4% FeAsS) is described. Finally, an electrochemical method for the detection of the different leachable and refractory silver phases (contained in two mineral concentrates) is presented. This paper reviews the power of the use of CPEmineral coupled to electrochemical techniques in hydrometallurgy.Keywords: CPE-mineral; dissolution mechanisms; electrochemical techniques. INTRODUCCIÓNLos sulfuros minerales son la principal fuente para la obtención de metales base, siendo los procesos pirometalúrgicos los que han sido tradicionalmente empleados para el procesamiento de estos minerales. Sin embargo, la emisión de SO 2(gas) y de partículas sólidas suspendidas en el aire, durante la combustión, ha llevado a la búsqueda de procesos limpios, siendo la ruta hidrometalúrgica la que ha recibido especial atención 1 .Los procesos de disolución oxidativa de muchos minerales (empleando oxidantes como Fe(III), O 2 , entre otros), han presentado algunos problemas que han impedido tener eficiencias satisfactorias en la aplicación industrial 1 . Es importante mencionar que las reacciones que toman lugar en los procesos hidrometalúrgicos son de naturaleza electroquímica y por lo tanto, su entendimiento es indispensable para la optimización de estos procesos.En el estudio electroquímico de minerales, se pueden emplear cristales de mineral como electrodos de prueba. No obstante, algunos minerales presentan ciertas propiedades semiconductoras que complican su caracterización. Por otro lado, la reproducibilidad experimental que estos electrodos proporcionan no es confiable, dado que la renovación de la superficie, para cada nueva experiencia es complicada.Los electrodos de pasta de carbono-mineral (CPE-mineral), donde el mineral pulverizado es mezclado con polvo de grafito, han mostrado su conveniencia en el estudio de mecanismos de minerales. Los CPE-mineral, pueden utilizar un aglomerante conductor, que puede ser H 2 SO 4 o bien HCl 2,3 . Por otro lado, los CPEmineral pueden ser preparados con aglomerantes no conductores ya sea usando aceites orgánicos, o bien aceites minerales, los cuales suelen ser hidrofóbicos 4,5 , permitiendo que las reacciones electroquímicas sólo tomen lugar en la interfase electrodoelectrolito. Esto últ...

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The electrochemical behaviour of galena (lead sulphide) — I. Anodic dissolution

Cited by 99 publications

References 3 publications

Electroanalytical chemistry for the analysis of solids: Characterization and classification (IUPAC Technical Report)

Electroanalytical chemistry for the analysis of solids: Characterization and classification (IUPAC Technical Report)

Suitability of the voltammetry of immobilized microparticles to detect and discriminate lead compounds in microsamples of ancient black cosmetics

Los electrodos de pasta de carbono en el estudio electroquímico de minerales metálicos

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