Speciation and characterization of arsenic in gold ores and cyanidation tailings using X-ray absorption spectroscopy

Paktunç, Doğan; Foster, Andrea L.; Heald, Steve M.; Laflamme, Gilles

doi:10.1016/j.gca.2003.07.013

Cited by 169 publications

(126 citation statements)

References 22 publications

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“…It has been described that the presence of high As(V) concentrations can be explained by the promotion of desorption of arsenates bound to iron oxyhydroxides at neutral-alkaline conditions, 64 as well as dissolution of thermodynamically unstable Fe and Ca-arsenates minerals. 65,66 Taking into account the low Fe concentrations present in the La Soterraña samples and their relatively high Ca and Mg concentrations, it seems that dissolution of Ca and Mg a Statistically significant correlation at the 95% confidence level (two-tailed). b Statistically significant correlation at the 99% confidence level (twotailed).…”

Section: Arsenic Speciationmentioning

confidence: 99%

Arsenic contamination and speciation in surrounding waters of three old cinnabar mines

et al. 2012

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The impact of arsenic pollution in waters from the surroundings of three abandoned Hg mines in Northern Spain, as well as reaching the Caudal River, was evaluated. For assessing the factors controlling arsenic release, an extensive study based on the physicochemical characterization and multivariate statistical analysis of waters upstream and downstream each mine site was performed. Waters downstream of the La Soterraña mine present the highest arsenic concentrations, up to 38.8 mg L À1 , coming mainly from the solubilisation of calcium, magnesium and strontium arsenates at a pH close to neutral. Although arsenic concentrations downstream of La Peña are markedly lower, these values remain too high, indicating that the encapsulation carried out in this spoil heap is insufficient. In addition, the high water flow in this point involves an extremely high input of arsenic to the surroundings (0.3 g s À1 ). Waters close to tailings from Los Rueldos suffer from acid mine drainage, provoking an important solubilisation of arsenic and heavy metals, a situation which is rapidly softened with distance. The study of arsenic speciation reveals the omnipresence of As(V) in waters from the three mines, whereas in La Peña low amounts of As(III) were also detected. Different preservation methods for As speciation were compared, such as the addition of HCl, EDTA and the storage of samples without any additive, and no alteration of samples in any case up to nine months after the collection was observed. A study of seasonal variations of As and the main parameters affecting its concentration and speciation was completed throughout a year, showing no remarkable dependency with rainfall for any studied variable.

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Section: Arsenic Speciationmentioning

confidence: 99%

Arsenic contamination and speciation in surrounding waters of three old cinnabar mines

et al. 2012

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“…Discrete, sand-sized, white aggregates, commonly observed in the waste, show the same composition. Fe/As molar ratios between 1 and 1.5 are indicative of arsenate minerals, while Fe/As molar ratios greater than 1.5 are considered to be Asrich iron oxyhydroxides (Paktunc et al, 2004). The Fe/As and Ca/As molar ratios of the analysed grains of $1.4 and 0.4, respectively, point towards calcium-iron arsenate compositions.…”

Section: Ore Crusher Areamentioning

confidence: 99%

“…17-3). The elemental composition of this component shown in Table 17-3 corresponds to iron oxyhydroxide phases, which can contain variable minor amounts of calcium, arsenic, sulphur, silicon and aluminium (Paktunc et al, 2004). This main component is extracted over the range 0.5-5 M HNO 3 (steps 9-14) with more defined windows of extraction at 0.5 M HNO 3 and 5 M HNO 3 (Fig.…”

Section: Arsenic Partitioning By Sequential Extractionsmentioning

confidence: 99%

“…However, higher As release was measured in the ore crusher sample with pH 7 and an ironcalcium-arsenic association. Neutral-alkaline conditions promote desorption of As bound to iron oxyhydroxides (Pierce and Moore, 1982) as well as dissolution of thermodynamically unstable iron and calcium arsenate minerals (Dove and Rimstidt, 1985;Paktunc et al, 2004). Arsenate mineral solubilities increase from ferric arsenates to calcium arsenates (Rochette et al, 1998;Paktunc et al, 2003).…”

Section: Geochemical Controls On As Mobilisationmentioning

confidence: 99%

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Arsenic speciation and mobility in mine wastes from a copper–arsenic mine in Devon, UK: a SEM, XAS, sequential chemical extraction study

PALUMBOROE¹,

KLINCK²,

CAVE³

2007

Trace Metals in the Environment

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The nature of As speciation is a determining factor for As mobility in mine wastes. In this study, scanning electron microscopy (SEM), X-ray absorption spectroscopy and sequential chemical extraction methods were used for the environmental, mineralogical and genetic characterisation of mine spoil and calciner wastes from Devon Great Consols Mine, an abandoned copper-arsenic mine in Devon, UK. The geochemical control of As-bearing phases on dissolved As during leaching was investigated.Arsenic is mainly present as As(V) co-precipitated or adsorbed with, or on, iron oxyhydroxides. The water extracts from the mine spoil and calciner wastes indicated a generally low dissolution of As, especially in sandy tailings (As water soluble 0.0004% of total As content). Thermodynamic calculations did not identify a major As phase controlling the composition of the water leachates, which suggests a process of desorption of iron oxyhydroxide-bound As as the source of As in the solution. A relative higher As mobility (As water soluble 3.7% of total As content) was found in the waste material with an alkaline pH in the vicinity of the ore crusher. Available thermodynamic data supported by SEM evidence and chemical extraction data suggest that calcium-arsenate phases such as weillite (CaHAsO 4 ) and calcium-copper arsenates together with scorodite (FeAsO 4 Á2H 2 O) and iron oxyhydroxides may all contribute to the higher As content in the alkaline waste leachates. The results indicate the importance of considering the nature of As in mine waste management. IntroductionEngland has a legacy of metalliferous mining possibly extending back to Roman times. A knowledge of the evolution of mine wastes and dispersion patterns is required to reduce concern in respect of the health hazard Trace Metals and other Contaminants in the Environment, Volume 9, 431-460

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“…Se discute la influencia de la erosión y el clima en los procesos de oxidación e intemperismo, así como la relativa estabilidad de los jales del DIMITO. Finalmente, se implementa un modelo matemático algébrico para el cálculo del ABA (Paktunc, 1998;Paktunc et al, 2004), como una herramienta útil para discutir el potencial riesgo y la movilidad de los EPT de los jales del DIMITO.…”

Section: Introductionunclassified

Geoquímica y mineralogía de los jales del distrito minero Tlalpujahua-El Oro, México, y sus implicaciones de impacto ambiental

et al. 2017

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RESUMENLos depósitos de jales del distrito minero de Tlalpujahua y El Oro (DIMITO) fueron apilados sobre laderas y cañadas con un sistema de drenaje activo y cubriendo un basamento constituido por calizas carbonosas y lutitas ± andesitas que constituyen la roca encajonante de las vetas auríferas de tipo epitermal. Su morfología actual muestra profundos canales y cárcavas de erosión y se ha estimado una pérdida de material >27-34 % de su volumen original. Se presentan los resultados de un estudio cartográfico de cinco depósitos de jales que fueron abandonados hace ~68 años, así como la caracterización mineralógica y geoquímica de 12 perfiles y 48 muestras representativas. Los jales están constituidos, en general, por una matriz limo-arenosa calcárea que contiene abundantes clastos líticos. Su pH es ligeramente alcalino de 7.5 a 8.5 y muestran una baja conductividad eléctrica <80 µS/cm. Están conformados por fragmentos de cuarzo (≥ 53-68 %), seguido de líticos (7-20 %), calcita (≥12 %), silicatos (9-11 %), FeTi-óxidos (≥2-3 %) y sulfuros y sulfosales (≤2 %). Su composición química varía de SiO 2 (56-92 %), Al 2 O 3 (>5-13 %), CaO+MgO (≥5-11 %), Fe tot (≤3-5 %), S total (0.3-0.91 %) y C total (3.4-6.1 %). Los jales presentan concentraciones promedio de elementos potencialmente económicos: Au (1.2-1.61 g/ton), Ag (28.1-46.8 g/ton), Pb (53.3-145.2 g/ton) y Zn (155.9-354.5 g/ton), que podrían tener un cierto rendimiento económico. En relación con las concentraciones de los elementos potencialmente tóxicos, los valores del Sb (43.9-72.2 g/ ton) superan ampliamente el LMP de alto riesgo (WHO, 2015) y una docena de muestras de Pb y Zn y de As (25.2-40.5 g/ton) muestran valores más altos a los del LMP de bajo riesgo. Sin embargo, éstos valores se observan dispersos y aleatorios en cada perfil, por lo que se discute su potencial tóxico con base en su correlación geoquímico-mineralógica y su potencial movilidad. Con el objetivo de estimar el balance ácido-base en los jales del DIMITO, se realizó un modelo matemático de normalización (reducción de Gauss) de los elementos mayores y su relación con los minerales normativos y su potencial tóxico. Se encontró que la mineralogía representa un potente indicador en el análisis de residuos mineros y su potencial tóxico, así como en general que los jales mostraron un bajo riesgo en la generación de drenaje ácido de mina. Sin embargo, se discuten el uso y manejo de la cobertura natural y su relación con los residuos y obras mineras del DIMITO.Palabras clave: geoquímica; mineralogía; jales; drenaje ácido; distrito minero Tlalpujahua y El Oro; México. (53)(54)(55)(56)(57)(58)(59)(60)(61)(62)(63)(64)(65)(66)(67)(68) calcite (≥12 %), . , , and , suggesting that they could still have some economic recovering. In relation to the concentrations of the potentially toxic elements, the values of significantly exceed high risk of the LMP (WHO, 2015), and a dozen samples of ABSTRACT The tailing dumps of the mining district of Tlalpujahua and El

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Speciation and characterization of arsenic in gold ores and cyanidation tailings using X-ray absorption spectroscopy

Cited by 169 publications

References 22 publications

Arsenic contamination and speciation in surrounding waters of three old cinnabar mines

Arsenic contamination and speciation in surrounding waters of three old cinnabar mines

Arsenic speciation and mobility in mine wastes from a copper–arsenic mine in Devon, UK: a SEM, XAS, sequential chemical extraction study

Geoquímica y mineralogía de los jales del distrito minero Tlalpujahua-El Oro, México, y sus implicaciones de impacto ambiental

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