Search Results - "VALENZUELA, Jesus L"

Thermodynamic and Kinetic Aspects of Gold Adsorption in Micrometric Activated Carbon and the Impact of Their Loss in Adsorption, Desorption, and Reactivation Plants by Martínez-Peñuñuri, Rodrigo, Parga-Torres, Jose R, Valenzuela-García, Jesus L, Díaz-Galaviz, Héctor J, González-Zamarripa, Gregorio, García-Alegría, Alejandro M

“…The production and loss of fine particles of activated carbon (AC) loaded with gold in the adsorption processes is a worldwide problem, mainly due to the…”
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Impact of mining activities on sediments in a semi-arid environment: San Pedro River, Sonora, Mexico by Gómez-Álvarez, Agustín, Valenzuela-García, Jesús L., Meza-Figueroa, Diana, de la O-Villanueva, Margarita, Ramírez-Hernández, Jorge, Almendariz-Tapia, Javier, Pérez-Segura, Efrén

“…► High total concentrations of metals were detected in the San Pedro River (SPR) (Fe > Cu > Mn > Zn > Pb > Cd). ► Residual and Fe/Mn oxide fractions were the…”
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Behavior of Metals Under Different Seasonal Conditions: Effects on the Quality of a Mexico–USA Border River by Gómez-Alvarez, Agustín, Meza-Figueroa, Diana, Valenzuela-García, Jesús L., Villalba-Atondo, Arturo I., Ramírez-Hernández, Jorge

“…Spatial and seasonal mobilization trends of metals in surface water were evaluated in the US–Mexico San Pedro River (SPR). Water samples were collected at five…”
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Mobility and Bioavailability of Metals in Stream Sediments Impacted by Mining Activities: the Jaralito and the Mexicana in Sonora, Mexico by Aguilar-Hinojosa, Yolanda, Meza-Figueroa, Diana, Villalba-Atondo, Arturo I., Encinas-Romero, Martín A., Valenzuela-García, Jesús L., Gómez-Álvarez, Agustín

“…This study aims at investigating heavy metal mobility and bioavailability in sediments from the Mexicana and Jaralito streams, Northern Mexico. A chemical…”
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Arsenic removal via electrocoagulation from heavy metal contaminated groundwater in La Comarca Lagunera México by Parga, Jose R., Cocke, David L., Valenzuela, Jesus L., Gomes, Jewel A., Kesmez, Mehmet, Irwin, George, Moreno, Hector, Weir, Michael

“…Arsenic contamination is an enormous worldwide problem. A large number of people dwelling in Comarca Lagunera, situated in the central part of northern México,…”
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Thermodynamic and Kinetic Study for Silver Recovery by Electrocoagulation Process by Montaño, Erick, Vázquez, Víctor, Valenzuela, Jesús L., Tiburcio, Guillermo, Parga, José, Valenzuela, Alejandro, Encinas, Martin

“…Merrill-Crowe is the primary process used for the concentration and purification of silver in a cyanide solution. The Langmuir Adsorption model for silver…”
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An Improved Process for Precipitating Cyanide Ions from the Barren Solution at Different pHs by Figueroa, Gabriela V., Parga, José R., Valenzuela, Jesus L., Vázquez, Victor, Valenzuela, Alejandro, Rodriguez, Mario

“…In recent decades, the use of metal sulfides instead of hydroxide precipitation in hydrometallurgical processes has gained prominence. Some arguments for its…”
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Cyanide Detoxification of Mining Wastewaters with TiO2 Nanoparticles and Its Recovery by Electrocoagulation by Parga, J. R., Vázquez, V., Casillas, H. M., Valenzuela, J. L.

“…Due to the widespread use of cyanide in mining operations, its recovery and destruction is important for both the environmental aspects of wastewater and its…”
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Mechanical and Bioactive Behavior of Hydroxyapatite-Wollastonite Sintered Composites by Encinas-Romero, M A, Aguayo-Salinas, S, Valenzuela-Garcia, J L, Payan, S R, Castillon-Barraza, F F

“…The effect of wollastonite amount on the mechanical and bioactive properties of several hydroxyapatite‐wollastonite sintered composites was evaluated. The…”
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Detoxification of cyanide using titanium dioxide and hydrocyclone sparger with chlorine dioxide by Parga, José R., Vazquez, Victor, Valenzuelab, Jesús L., Matamorosa, Zully, Gonzalez, Gregorio

“…The extraction of gold and silver from minerals and concentrates with cyanide is an important hydrometallurgy process that has been studied for more than 120…”
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Assessment of the impact on sediment quality from abandoned artisanal mine runoffs in a semi-arid environment (the Sonora River basin—Northwestern Mexico) by Guzmán, Héctor M., Gómez-Álvarez, Agustín, Valenzuela-García, Jesús L., Encinas-Romero, Martín A., Villalba-Atondo, Arturo I., Encinas-Soto, Kareen K.

“…Impact to streams that receive runoffs from the abundant abandoned artisan-scale mines disseminated throughout the middle and upper Sonora river basin in…”
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Pressure cyanide leaching for precious metals recovery by Parga, José R., Valenzuela, Jesús L., Francisco, Cepeda T.

“…The ferric ions can also contribute to the oxidation of silver iron sulfide, argentite, pyrite, pyrrhotite, sphalerite, and chalcopyrite (see Equations 4-9,…”
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Continuous Laboratory Gold Solvent Extraction from Cyanide Solutions using LIX 79 Reagent by Aguayo, S., Valenzuela, J. L., Parga, J. R., Lewis, R. G., Cruz, M.

“…Continuous laboratory solvent extraction of gold from cyanide solutions has been investigated by using LIX 79 guanidine‐based extractant. Different variables…”
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Dissolution of Silver and Gold with Sodium Hypochlorite and Hydrochloric Acid in Refractory Minerals (Mangano-Argentiferous) by Tiburcio-Munive, Guillermo, Salazar-Campoy, María M., Valenzuela-García, Jesús L., Hernández-Negrete, Ofelia, Vázquez-Vázquez, Víctor

“…The present study examined a process for precious metal recovery (silver and gold) from difficult minerals which exhibit refractory characteristics to…”
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Comparative Study of Gold Extraction from Refractory Pyritic Ores through Conventional Leaching and Simultaneous Pressure Leaching/Oxidation by Salazar-Campoy, María M., Valenzuela-García, Jesús L., Quiróz-Castillo, Luis S., Encinas-Romero, Martín A., Tiburcio-Munive, Guillermo, Guerrero-Germán, Patricia, Parga-Torres, José R.

“…Pressure oxidation is a hydrometallurgical oxidative pretreatment for refractory ores, such as sulfide ores. Here, simultaneous alkaline pressure oxidation and…”
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Chemical partitioning of sediment contamination by heavy metals in the San Pedro River, Sonora, Mexico by Gómez-Álvarez, Agustín, Valenzuela-García, Jesús L., Aguayo-Salinas, Salvador, Meza-Figueroa, Diana, Ramírez-Hernándezc, Jorge, Ochoa-Ortega, Gabriel

“…The present work describes the chemical forms of six heavy metals (Cd, Cu, Fe, Mn, Pb and Zn) and their space distribution on the San Pedro River sediments, by…”
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Distribution of heavy metals and their chemical speciation in sediments from the Abelardo L. Rodríguez Dam, Sonora, México by Gómez-Álvarez, Agustín, Valenzuela-García, Jesús L., Villalba-Atondob, Arturo I., Meza-Figueroa, Diana, Almendariz-Tapia, Francisco J., Whitaker-Bojórquez, Tracy O., Marítnez-Morales, Flor, Valenzuela-Corral, Magdalena, Ochoa-Valenzuela, Luís E.

“…The purpose of this study was to investigate the distribution of total and bioavailable metals (Cd, Cu, Cr, Fe, Mn, Pb and Zn) in sediments of the Abelardo L…”
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Copper biosorption in an aerobic bioreactor by Monge-Amaya, Onofre, Valenzuela-García, Jesús L., Acedo-Félix, Evelia, Teresa Certucha-Barrágan, María, Schoor-Wiener, Michael, Javier Almendariz-Tapia, F.

“…This study evaluates the biosorption of copper by aerobic biomass that was selected from surface waters of the San Pedro River in Sonora, Mexico. Using a batch…”
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Arsenic removal via electrocoagulation from heavy metal contaminated groundwater in La Comarca Lagunera México by PARGA, Jose R, COCKE, David L, VALENZUELA, Jesus L, GOMES, Jewel A, KESMEZ, Mehmet, IRWIN, George, MORENO, Hector, WEIR, Michael

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AN EVALUATION STUDY OF A TRANSITIONAL BILINGUAL EDUCATION PROGRAM (ACADEMIC ACHIEVEMENT, SPANISH DOMINANT PUPILS; ARIZONA) by DE LA GARZA, JESUS VALENZUELA

“…The focus of this evaluation study was to investigate how and to what extent a transitional bilingual education (TBE) program may have contributed to the…”
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