Oxidation of Chalcopyrite (CuFeS&lt;sub&gt;2&lt;/sub&gt;) by &lt;i&gt;Acidithiobacillus Ferrooxidans&lt;/i&gt; and a Mixed Culture of &lt;i&gt;Acidithiobacillus Ferrooxidans&lt;/i&gt; and &lt;i&gt;Acidithiobacillus Thiooxidans&lt;/i&gt; Like Bacterium in Shake Flasks

Mejía, Esteban; Ospina, Juan David; Márquez,; Morales, A. L.

doi:10.4028/www.scientific.net/amr.71-73.385

Cited by 7 publications

(8 citation statements)

References 16 publications

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“…In the higher potential area (days [16][17][18][19][20][21][22][23][24][25][26][27][28][29][30], the release of copper was smaller than that in the lower-potential region because there might not have been enough ferrous ion to promote chalcopyrite bioleaching. The present findings agree with those of previous works [3,4,10,34,35]. The hypotheses in these works were that the chalcopyrite dissolution was catalyzed by the ferrous ion according to the following reactions (1-3):…”

Section: Chalcopyrite Leaching Experimentssupporting

confidence: 93%

“…Jarosite phase could be considered as the unfavorable phase because its presence apparently would passivate the copper release [5,10,11,16,[34][35][36][37][38]. The jarosite formation was more marked from 15 th day onward, when the system showed a lower concentration of ferrous ion, a higher concentration of ferric ion, increased redox potential, and a high concentration of SO 4…”

Section: Mineralogical Analysismentioning

confidence: 99%

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Mineralogical Characterization of Chalcopyrite Bioleaching

Mejía¹,

Ospina²,

Bedoya³

et al. 2015

Fourier Transform - Signal Processing and Physical Sciences

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Section: Chalcopyrite Leaching Experimentssupporting

confidence: 93%

Section: Mineralogical Analysismentioning

confidence: 99%

Mineralogical Characterization of Chalcopyrite Bioleaching

Mejía¹,

Ospina²,

Bedoya³

et al. 2015

Fourier Transform - Signal Processing and Physical Sciences

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“…Lo cual puede deberse a la formación de pares galvánicos de los sulfuros en contacto, favoreciendo la disolución del sulfuro con menor potencial de reposo. Por ejemplo, se ha reportado que la esfalerita en contacto con calcopirita favorece la disolución de la esfalerita y que la esfalerita en contacto con galena favorece la disolución de esta última (Mejía, Ospina, Márquez, & Morales, 2009;Urbano, Meléndez, Reyes, Veloz, González, 2007).…”

Section: Ensayo Bunclassified

Mineralogía del proceso de lixiviación de oro en minerales refractarios con soluciones de tiosulfato

et al. 2016

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La mineralogía de procesos es una herramienta que ofrece información de gran utilidad para la modificación de procesos de obtención de oro para mejorar su eficiencia. El objetivo de este trabajo fue evaluar la mineralogía y la oxidación del mineral en el proceso de lixiviación de oro a partir de muestras de mineral aurífero refractario con soluciones de tiosulfato mediante técnicas analíticas como la Microscopía Óptica de Luz Plana Polarizada (MOLPP), Tratamiento Digital de Imágenes TDI, Microscopía Electrónica de Barrido (SEM/EDS) y Difracción de Rayos X (DRX). La caracterización mineralógica previa al proceso de lixiviación reveló asociación, tamaño y forma de ocurrencia de cada una de las fases minerales, encontrándose que el mineral empleado estaba compuesto principalmente por pirita en cristales inequigranulares y subhedrales (58% de la muestra); cristales de galena (15% de la muestra); cristales de esfalerita, calcopirita y arsenopirita (7% de la muestra);menos del 1% de oro libre y fases de aluminosilicatos (19% de la muestra). Ensayos al fuego mostraron 59 g/ton de oro y 70 g/ton de plata. Luego del proceso de lixiviación se encontró acumulación de granos individuales de pirita con surcos de corrosión, disminución de su tamaño de partícula, así como la disolución de las fases acompañantes:esfalerita, calcopirita, galena y arsenopirita. No se observó la presencia de cobre precipitado. Fue necesario realizar un pretratamiento oxidante del mineral, seguido por una lixiviación se logró una liberación de oro hasta del 82%. La caracterización mineralógica permitió definir condiciones adecuadas para la recuperación de oro.

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“…Temperature, pH, physiologies of individual species, and other factors, such as metals and toxic ions, are determinative factors for the "logically designed" consortium. Previous reports indicated that cultures prepared on the basis of the bottom-up approach were more efficient in accelerating mineral oxidation (2,7,(24)(25)(26)(27)(28)(29). A previous study by us had demonstrated that a culture containing autotrophs and mixotrophs was far more effective in promoting chalcopyrite leaching than a mixed culture containing any combination of two or three of the four species (Acidithiobacillus caldus, Leptospirillum ferriphilum, Sulfobacillus sp., and Ferroplasma thermophilum) (30).…”

mentioning

confidence: 99%

A Moderately Thermophilic Mixed Microbial Culture for Bioleaching of Chalcopyrite Concentrate at High Pulp Density

Wang

Zeng

Qiu

et al. 2014

Appl Environ Microbiol

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Three kinds of samples (acid mine drainage, coal mine wastewater, and thermal spring) derived from different sites were collected in China. Thereafter, these samples were combined and then inoculated into a basal salts solution in which different substrates (ferrous sulfate, elemental sulfur, and chalcopyrite) served as energy sources. After that, the mixed cultures growing on different substrates were pooled equally, resulting in a final mixed culture. After being adapted to gradually increasing pulp densities of chalcopyrite concentrate by serial subculturing for more than 2 years, the final culture was able to efficiently leach the chalcopyrite at a pulp density of 20% (wt/vol). At that pulp density, the culture extracted 60.4% of copper from the chalcopyrite in 25 days. The bacterial and archaeal diversities during adaptation were analyzed by denaturing gradient gel electrophoresis and constructing clone libraries of the 16S rRNA gene. The results show that the culture consisted mainly of four species, including Leptospirillum ferriphilum, Acidithiobacillus caldus, Sulfobacillus acidophilus, and Ferroplasma thermophilum, before adapting to a pulp density of 4%. However, L. ferriphilum could not be detected when the pulp density was greater than 4%. Real-time quantitative PCR was employed to monitor the microbial dynamics during bioleaching at a pulp density of 20%. The results show that A. caldus was the predominant species in the initial stage, while S. acidophilus rather than A. caldus became the predominant species in the middle stage. F. thermophilum accounted for the greatest proportion in the final stage.

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Oxidation of Chalcopyrite (CuFeS<sub>2</sub>) by <i>Acidithiobacillus Ferrooxidans</i> and a Mixed Culture of <i>Acidithiobacillus Ferrooxidans</i> and <i>Acidithiobacillus Thiooxidans</i> Like Bacterium in Shake Flasks

Cited by 7 publications

References 16 publications

Mineralogical Characterization of Chalcopyrite Bioleaching

Mineralogical Characterization of Chalcopyrite Bioleaching

Mineralogía del proceso de lixiviación de oro en minerales refractarios con soluciones de tiosulfato

A Moderately Thermophilic Mixed Microbial Culture for Bioleaching of Chalcopyrite Concentrate at High Pulp Density

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