Browsing by Author "888bef62-9d76-4bff-888c-75b6f37b6bb1"
Now showing items 1-12 of 12
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Xia, Le Xian; Shen, Zhen; Vargas Valero, Tomás; Sun, Wen Juan; Ruan, Ren Man; Xie, Zhen Da; Qiu, Guan Zhou (Springer, 2013)Attachments of Acidithiobacillus ferrooxidans ATCC 23270 onto elemental sulfur, quartz and complex chalcopyrite were investigated by analysis of its extracellular polymeric substances as well as applying Langmuir and ...
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Meruane, Gabriel; Vargas Valero, Tomás (ELSEVIER, 2003-10)The oxidation of ferrous iron by Acidithiobacillus ferrooxidans in the pH range 2.5-7.0 was characterized. In order to measure the rate of bacterial oxidation of ferrous iron with A. ferrooxidans in this high pH range, a ...
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Casas de Prada, Jesús; Martínez, J.; Moreno, L.; Vargas Valero, Tomás (1998-08)A two-dimensional (2-D) model for a heap or dump bioleaching of a copper ore containing mainly chalcocite and pyrite has been developed. The rate of the mineral sulfide dissolution was related to the rate of oxidation ...
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Paipa, C.; Mateo, Magda; Godoy, I.; Poblete, E.; Toral Ponce, María; Vargas Valero, Tomás (PERGAMON-ELSEVIER SCIENCE LTD, 2005-09)In leaching solutions coming from the hydrometallurgical processing of copper sulphides, it is necessary to determine the concentrations of Fe-total,Fe- Fe+2 and Fe+3. It is known that the 5-sulfosalicylic acid (SSA) forms ...
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Cáceres, Luis; Vargas Valero, Tomás; Herrera, Leandro (2007)Corrosion of carbon steel in un-buffered NaCl solutions was studied applying linear potential sweep technique to a rotating disk electrode. Current-potential curves were obtained from linear potential sweep at a rate of 1 ...
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Luca, R.; Townley Callejas, Brian; Escobar Miguel, Blanca; Vargas Valero, Tomás (ELSEVIER, 2008-11)An experimental study was conducted for assessing the formation of hydrocarbon gaseous compounds during bioleaching of copper sulphide ores with mesophilic microorganisms. Three different mineral samples were used: a pyrite ...
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Vargas Valero, Tomás; Díaz Toledo, Hugo; Silva, Carmen I.; Fuenzalida, Víctor M. (1997-01)The formation mechanism of BaTiO, films produced by a hydrothermal-electrochemical method was characterized using electrochemical techniques. Experiments were conducted in a three-electrode electrochemical cell, with ...
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Bahamóndez, C.; Castro, R.; Vargas Valero, Tomás; Arancibia, E. (The Southern African Institute of Mining and Metallurgy, 2015)Rising costs in the mining industry have necessitated a search for alternative methods for the recovery of metals from deposits that are no longer economically or environmentally exploitable by conventional mining. These ...
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Vargas Valero, Tomás; Estay Cuenca, Humberto; Arancibia Villegas, Ernesto; Díaz Quezada, Simón (Elsevier, 2020)There is a growing interest in exploring the application of bioleaching for treating copper sulfide ores of decreasing grade and located at larger depth by in situ recovery (ISR) for its potential savings in ore extraction, ...
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Jaramillo Martínez, Katherine; Vargas Valero, Tomás (Taylor & Francis, 2020)Cupric chloride leaching is an attractive alternative for the treatment of pyritic refractory gold ores. In this context, the kinetics of pyrite dissolution was studied in cupric chloride solutions containing 4 M NaCl. ...
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Escobar, Ivan S.; Silva, Carmen I.; Vargas Valero, Tomás; Fuenzalida, Victor M. (2000)The control of the microstructure of BaTiO3 films grown on titanium by the hydrothermal–electrochemical method was investigated. Experiments were conducted in a three-electrode high-pressure electrochemical cell in a ...
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Hidalgo, Jacqueline; Colet Lagrille, Melanie; Mukasyan, Alexander; Fuenzalida Escobar, Víctor; Vargas Valero, Tomás (Wiley-Blackwell, 2015)This work reports the synthesis of nanostructured ZrO2 by anodization of zirconium electrodes at potentials well below the range of 10–50 V used as a standard procedure. Zirconium was first anodized in a 1M (NH4)2SO4 ...