ESI UAdeC

Nueva Rosita, Mexico

ESI UAdeC

Nueva Rosita, Mexico
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Pecina E.T.,ESI UAdeC | Castillo P.,CIMAV | Martinez D.,ESI UAdeC | Orrantia E.,CIMAV
Minerals and Metallurgical Processing | Year: 2010

Bioleaching is a viable option for the processing of auriargentiferous refractory ores with high arsenic content. The application ofmesophilic (A. ferrooxidans and "L. ferrooxidans") and thermophilic bacteria of the genus Sulfolobus (S. solfataricus and S. acidocaldariusj as oxidant treatment before the cyanidation of an industrial arsenical pyrite concentrate is presented. The results show that extraction of gold and silver increases due to biooxidation caused by mesophilic bacteria and results in a maximum gold recovery of 68%. In all strains studied, biooxidation resulted in an average silver recovery of 50%. The results showed that all evaluated strains were sensitive to solids content (5 to 20%) and average particle size (75 and 38 pm) of the concentrate. Copyright 2010, Society for Mining, Metallurgy, and Exploration, Inc.


Gonzalez-Anaya J.A.,CIMAV | Gonzalez-Anaya J.A.,CINVESTAV | Nava-Alonso F.,CINVESTAV | Pecina-Trevino E.T.,ESI UAdeC
Ozone: Science and Engineering | Year: 2011

Precious metals are generally recovered from their ores by cyanide leaching. When the gold or silver are locked up in the mineral matrix, they remain unrecovered and the ore is classified as refractory to cyanidation. Ozonization in acidic media of an arsenopyritic-pyritic highly refractory gold concentrate (110 g Au/t) as a treatment prior to cyanidation was evaluated. While the conventional cyanidation of this concentrate recovers only 9% of the gold, a pretreatment with ozone before the cyanidation increases the gold recovery to 23%. The rest of the gold is in solid solution with the matrix. Even if this increase in gold extraction is not large enough to economically process this specific concentrate, it demonstrates that the gold locked up in pyrite or arsenopyrite could be recovered by ozonating the ore before cyanidation. © 2011 International Ozone Association.


Diaz-Lopez C.V.,CIMAV | Pecina-Trevino E.T.,ESI UAdeC | Orrantia-Borunda E.,CIMAV
Canadian Metallurgical Quarterly | Year: 2012

The objective of this work was to determine the behaviour of chalcopyrite (Cp) and pyrrhotite (Po) in microflotation tests using pure minerals and mixtures in the presence of Leptospirillum ferrooxidans. Tests were carried out in the presence and absence of an unconventional collector, isopropyl ethyl thionocarbamate. The results indicate that chalcopyrite and pyrrhotite act differently alone than in a mixture which means the presence of pyrrhotite inhibits chalcopyrite recovery. For chalcopyrite, the flotation rate significantly increases in the presence of bacteria in the first 10 min of contact which is an indication of a first order kinetic equation. The results in the presence of an unconventional collector suggest that the interaction between mineral and thionocarbamate is chemical and not due to the galvanic effect. © 2012 Canadian Institute of Mining, Metallurgy and Petroleum.


Ramos-Escobedo G.T.,CIMAV | Pecina-Trevino E.T.,ESI UAdeC | Bueno Tokunaga A.,ESI UAdeC | Concha-Guerrero S.I.,CIMAV | And 3 more authors.
Fuel | Year: 2016

In this study a strain of Staphylococcus carnosus whose characteristics of hydrophobicity and ability to change the surface charge of some minerals such as coal, by excreting some exopolymers, has been used as bio-collector to evaluate the recovery of fine coal tailings mineral through micro-flotation, from the two sub-basins located in the Sabinas basin and identified as: Sabinas (CFP) and Rio Escondido (CFM), located in Coahuila, Mexico. Results show that in the absence of microorganism recovery is about 50% and that using S. carnosus recovery reaches values close to 90% in both samples of coal for a time of 12 h and a pH of 9. Mechanism has been investigated using techniques such as adhesion kinetics, adsorption isotherms, and infrared spectroscopy. It illustrates that biofilm consisted of excreted chemicals, such as fatty acids, improves the hydrophobicity of the coal surface. © 2016 Elsevier Ltd. All rights reserved.


Gonzalez-Anaya J.A.,CIMAV | Nava-Alonso F.,CINVESTAV | Pecina-Trevino E.T.,ESI UAdeC
Minerals and Metallurgical Processing | Year: 2011

This laboratory work presents a study of the effect of ultrafine grinding on the gold recovery of a highly refractory gold concentrate. The particle size of the concentrate was P80 = 46 pm and the main species present were quartz (28.58%), dolomite (25.63%), pyrite (20.93%), arsenopyrite (15.39%) and 112 g/t gold. After optimizing hydrated lime and lead nitrate additions, standard cyanidation with 1% NaCN, pH = 12.3,25% S/L permits to recover only 9.4% of the gold. Different particle sizes were submitted to cyanidation. When the concentrate was ground to ultrafine sizes (P80= 4.6 p.m), the gold recovery for the same cyanidation conditions increased to 67%, with cyanide consumption of 66.7 kg NaCN/t. Additional tests were performed in order to reduce the cyanide consumption. The reduction of the cyanide concentration in the leaching solution from 1 to 0.5% and the addition of 100 g Pb(NO 3)2/t allowed the reduction of the cyanide consumption to 27.6 kg NaCN/t (58% reduction), while maintaining the same gold recovery of 67%. The remaining gold could be present as very fine inclusions or in solid solution in the matrix. Copyright 2011, Society for Mining, Metallurgy, and Exploration, Inc.


Gallegos-Acevedo P.M.,Institute Mineria | Espinoza-Cuadra J.,Institute Mineria | Perez-Garibay R.,CINVESTAV | Pecina-Trevino E.T.,ESI UAdeC
Journal of Mining Science | Year: 2010

This paper presents an experimental methodology to capture and record an image sequence to observe and quantitatively characterize bubble coalescence phenomenon. The effect of the solids attached onto the bubble surface and its interaction with other bubbles both empty and loaded are examined. In addition, a coalescence mechanism in the froth zone of flotation columns and some experimental results obtained at the laboratory scale are discussed. © 2010 Pleiades Publishing, Ltd.

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