This page has only limited features, please log in for full access.
Electronic waste (e‐waste) contains metallic values that can be recovered by hydrometallurgical methods. This investigation addresses the leaching kinetics of e‐waste for the recovery of copper in H2SO4‐H2O2 media with the objective of determining the rate‐controlling step in monosize particle systems. The results are then used to develop a kinetic model for copper dissolution in multisize particle systems. It is shown that in a monosize particle system, Cu dissolves completely in 150 min at 2 M H2SO4 and 0.2 M H2O2. The rate‐controlling step for this process is chemical reaction with an activation energy of 47.8 kJ/mol. The kinetic model for Cu dissolution in multisize particle systems is developed by applying an optimization method that considers the size distribution and the copper content of each of the size fractions. The results show that the model predicts satisfactorily the Cu dissolution kinetics and reveals that Cu particles with mean sizes of 79, 141, 237, 398.5, and 605 μm react completely in times varying from 15 to 120 min. Coarser Cu particles do not react completely in a time interval of up to 120 min. E‐waste losses 57.6% of its initial weight when subjected to the leaching process and solid residue has gold and silver grades of 2 402.35 and 9 035.29 g/ton, respectively.
Gloria I. Dávila‐Pulido; Armando Salinas‐Rodríguez; Francisco R. Carrillo‐Pedroza; Adrián A. González‐Ibarra; Juan Méndez‐Nonell; Mitzué Garza‐García. Leaching kinetics of electronic waste for the recovery of copper: Rate‐controlling step and rate process in a multisize particle system. International Journal of Chemical Kinetics 2020, 53, 379 -389.
AMA StyleGloria I. Dávila‐Pulido, Armando Salinas‐Rodríguez, Francisco R. Carrillo‐Pedroza, Adrián A. González‐Ibarra, Juan Méndez‐Nonell, Mitzué Garza‐García. Leaching kinetics of electronic waste for the recovery of copper: Rate‐controlling step and rate process in a multisize particle system. International Journal of Chemical Kinetics. 2020; 53 (3):379-389.
Chicago/Turabian StyleGloria I. Dávila‐Pulido; Armando Salinas‐Rodríguez; Francisco R. Carrillo‐Pedroza; Adrián A. González‐Ibarra; Juan Méndez‐Nonell; Mitzué Garza‐García. 2020. "Leaching kinetics of electronic waste for the recovery of copper: Rate‐controlling step and rate process in a multisize particle system." International Journal of Chemical Kinetics 53, no. 3: 379-389.
The sludge from a wet-off gas cleaning system of the iron blast furnace (BF) contains significant amounts of iron; however, they cannot be recycled due to their high content of zinc and alkalis. These compounds are detrimental to the optimal performance of iron and steelmaking furnaces. In this work, a comparative laboratory study to reduce zinc and alkali contained in the blast furnace sludge (BFS) is presented. The effect of leaching parameters such as oxidant (i.e., ferric ion, oxygen or ozone), aqueous solution media (i.e., 0.2 M NH4Cl, 0.2 M HCl and 0.1 M H2SO4) and temperature (i.e., 27 and 80 °C) on Zn and alkalis (Na2O and K2O) removal were studied by applying an experimental design. The results obtained show that Zn and K2O removal of 85% and 75% were achieved under the following conditions: Ozone as an oxidant agent and 0.1 M H2SO4 as an aqueous medium, temperature had no significant effect. The results are supported by thermodynamic diagrams and the possible chemical reactions are mentioned. Although the results also indicate that leaching under the above conditions dissolves up to 9% of iron, this loss is much less than leaching without the oxidizing conditions generated by the ozone. The BFS obtained from this treatment could be recirculated to the iron or steelmaking processes to recover iron values.
Ma. De Jesus Soria-Aguilar; Gloria Ivone Davila-Pulido; Francisco Raul Carrillo-Pedroza; Adrian Amilcare Gonzalez-Ibarra; Nallely Picazo-Rodriguez; Felipe López; Juan Ramos-Cano. Oxidative Leaching of Zinc and Alkalis from Iron Blast Furnace Sludge. Metals 2019, 9, 1015 .
AMA StyleMa. De Jesus Soria-Aguilar, Gloria Ivone Davila-Pulido, Francisco Raul Carrillo-Pedroza, Adrian Amilcare Gonzalez-Ibarra, Nallely Picazo-Rodriguez, Felipe López, Juan Ramos-Cano. Oxidative Leaching of Zinc and Alkalis from Iron Blast Furnace Sludge. Metals. 2019; 9 (9):1015.
Chicago/Turabian StyleMa. De Jesus Soria-Aguilar; Gloria Ivone Davila-Pulido; Francisco Raul Carrillo-Pedroza; Adrian Amilcare Gonzalez-Ibarra; Nallely Picazo-Rodriguez; Felipe López; Juan Ramos-Cano. 2019. "Oxidative Leaching of Zinc and Alkalis from Iron Blast Furnace Sludge." Metals 9, no. 9: 1015.
The cyanidation process is used for the recovery of gold and silver from their ores. However, during cyanidation, some of the copper minerals present are also dissolved, resulting in the presence of copper impurities in the form of cuprocyanide complexes. A high copper content in solution decreases the recovery of precious metals, mainly due to zinc passivation during gold/silver cementation. The objective of this work is to study the effect on copper electrowinning of the cyanide/copper molar ratio, the potential applied to the electrolytic cell, the temperature and circulation rate of the solution, and the use of synthetic solutions with physicochemical characteristics similar to those of an industrial solution. The experiments were carried out in electrolytic reactors using different regimes (i.e. batch and continuous). The results obtained indicate that an applied potential of 4 V at temperatures above of 25°C, significantly increases the amount of copper removed, while high cyanide concentrations resulted in low levels of copper removal. Furthermore, the intensification of the agitation of the solution increases the amount of copper removed due to enhanced mass transfer conditions. Copper removal in the continuous reactor was of approximately 50%. Metallic copper was deposited on the cathode and copper oxide and copper hydroxide on the anode.
G. I. Dávila-Pulido; J. M. Flores-Álvarez; A. Uribe-Salas; Felipe López. Copper removal from a cyanidation liquor by electrowinning using batch and continuous flow cells. Canadian Metallurgical Quarterly 2019, 59, 17 -25.
AMA StyleG. I. Dávila-Pulido, J. M. Flores-Álvarez, A. Uribe-Salas, Felipe López. Copper removal from a cyanidation liquor by electrowinning using batch and continuous flow cells. Canadian Metallurgical Quarterly. 2019; 59 (1):17-25.
Chicago/Turabian StyleG. I. Dávila-Pulido; J. M. Flores-Álvarez; A. Uribe-Salas; Felipe López. 2019. "Copper removal from a cyanidation liquor by electrowinning using batch and continuous flow cells." Canadian Metallurgical Quarterly 59, no. 1: 17-25.
In the concentrators of a Mexican mining company has been observed that the pH of the flotation has a significant effect on the galena recovery: the increase of pH from 7.5 to 9.5 in the Pb/Cu flotation circuit, resulted in a decrease of about 10% of lead recovery. In the present investigation, experimental models and techniques were developed to study the effect of pH on xanthate and di-isobutyl dithiophosphinate adsorption onto galena. The results obtained by UV / Vis spectroscopy showed that once galena surface has been slightly oxidised by the dissolved oxygen of the aqueous suspension, adsorption of both surfactants increases significantly, being adversely affected by the increase of pH from 5.5 to 9.5. Microflotation measurements performed for both surfactants support these findings. Thermodynamic simulation of the system suggests that the observed behaviour is due to the nature of the solid species formed on the galena surface at the particular pH: lead sulfate (PbSO4) under neutral and slightly acid conditions, and the basic sulfate (2PbO·PbSO4) under neutral and slightly alkaline conditions, as well as to their respective solubility. Infrared spectrometry confirmed the occurrence of sulfate onto galena particles, with a higher concentration for the acid pre-conditioning compared to the alkaline pre-conditioning.
Martha Araceli Elizondo-Álvarez; G.I. Dávila-Pulido; Simón Bello-Teodoro; Alejandro Uribe-Salas. Role of pH on the adsorption of xanthate and dithiophosphinate onto galena. Canadian Metallurgical Quarterly 2018, 58, 107 -115.
AMA StyleMartha Araceli Elizondo-Álvarez, G.I. Dávila-Pulido, Simón Bello-Teodoro, Alejandro Uribe-Salas. Role of pH on the adsorption of xanthate and dithiophosphinate onto galena. Canadian Metallurgical Quarterly. 2018; 58 (1):107-115.
Chicago/Turabian StyleMartha Araceli Elizondo-Álvarez; G.I. Dávila-Pulido; Simón Bello-Teodoro; Alejandro Uribe-Salas. 2018. "Role of pH on the adsorption of xanthate and dithiophosphinate onto galena." Canadian Metallurgical Quarterly 58, no. 1: 107-115.
This paper presents and discusses the results of an experimental study designed to investigate the feasibility of removing calcium and sulfate from saturated solutions by using calcium aluminate-based compounds. The results obtained show that the treatment of saturated solutions (0.016 mol/L CaSO4) alkalinized at pH above 12 by adding 0.75 g/L CaO and treated with a calcium aluminate-based compound (C70: 70% Al2O3, 30% CaO), promotes the precipitation of calcium sulfate as ettringite, which is a hydrated calcium sulfoaluminate, in equilibrium with residual calcium and sulfate concentrations below 200 mg/L. The active species of compound C70 is the monocalcium aluminate (CaO·Al2O3), which is the responsible of promoting ettringite precipitation. The use of a large excess of monocalcium aluminate significantly increases the removal kinetics but has the disadvantage that the excess is eventually hydrolyzed releasing calcium and aluminate ions to the solution. It was also observed that an excessively long contact time (e.g., 50 h), results in the acidification of the suspension due to absorption of atmospheric CO2, causing the dissolution of the ettringite, which is stable at pH above 11.5. The best experimental conditions observed are the use of a slight excess of reactants (with respect to the stoichiometrically required): 0.75 g/L CaO and 2 g/L of C70 and a reaction time of 6 h.
Angel Daniel Guerrero-Flores; A. Uribe-Salas; G.I. Dávila-Pulido; José Manuel Flores-Álvarez. Simultaneous removal of calcium and sulfate ions from flotation water of complex sulfides. Minerals Engineering 2018, 123, 28 -34.
AMA StyleAngel Daniel Guerrero-Flores, A. Uribe-Salas, G.I. Dávila-Pulido, José Manuel Flores-Álvarez. Simultaneous removal of calcium and sulfate ions from flotation water of complex sulfides. Minerals Engineering. 2018; 123 ():28-34.
Chicago/Turabian StyleAngel Daniel Guerrero-Flores; A. Uribe-Salas; G.I. Dávila-Pulido; José Manuel Flores-Álvarez. 2018. "Simultaneous removal of calcium and sulfate ions from flotation water of complex sulfides." Minerals Engineering 123, no. : 28-34.
Martha Araceli Elizondo-Álvarez; José Manuel Flores-Álvarez; Gloria Ivone Dávila-Pulido; Alejandro Uribe-Salas. Interaction mechanism between galena and calcium and sulfate ions. Minerals Engineering 2017, 111, 116 -123.
AMA StyleMartha Araceli Elizondo-Álvarez, José Manuel Flores-Álvarez, Gloria Ivone Dávila-Pulido, Alejandro Uribe-Salas. Interaction mechanism between galena and calcium and sulfate ions. Minerals Engineering. 2017; 111 ():116-123.
Chicago/Turabian StyleMartha Araceli Elizondo-Álvarez; José Manuel Flores-Álvarez; Gloria Ivone Dávila-Pulido; Alejandro Uribe-Salas. 2017. "Interaction mechanism between galena and calcium and sulfate ions." Minerals Engineering 111, no. : 116-123.
José Manuel Flores-Álvarez; Martha Araceli Elizondo-Álvarez; Gloria Ivone Dávila-Pulido; Angel Daniel Guerrero-Flores; Alejandro Uribe-Salas. Electrochemical behavior of galena in the presence of calcium and sulfate ions. Minerals Engineering 2017, 111, 158 -166.
AMA StyleJosé Manuel Flores-Álvarez, Martha Araceli Elizondo-Álvarez, Gloria Ivone Dávila-Pulido, Angel Daniel Guerrero-Flores, Alejandro Uribe-Salas. Electrochemical behavior of galena in the presence of calcium and sulfate ions. Minerals Engineering. 2017; 111 ():158-166.
Chicago/Turabian StyleJosé Manuel Flores-Álvarez; Martha Araceli Elizondo-Álvarez; Gloria Ivone Dávila-Pulido; Angel Daniel Guerrero-Flores; Alejandro Uribe-Salas. 2017. "Electrochemical behavior of galena in the presence of calcium and sulfate ions." Minerals Engineering 111, no. : 158-166.
Minerals & Metallurgical Processing
Felipe López; A. Uribe-Salas; G.I. Dávila-Pulido; L. Magallanes-Hernandez; José Alberto Batista Rodríguez. Effects of solids concentration on gas dispersion in industrial mechanical cells. Minerals & Metallurgical Processing 2017, 34, 30 -35.
AMA StyleFelipe López, A. Uribe-Salas, G.I. Dávila-Pulido, L. Magallanes-Hernandez, José Alberto Batista Rodríguez. Effects of solids concentration on gas dispersion in industrial mechanical cells. Minerals & Metallurgical Processing. 2017; 34 (1):30-35.
Chicago/Turabian StyleFelipe López; A. Uribe-Salas; G.I. Dávila-Pulido; L. Magallanes-Hernandez; José Alberto Batista Rodríguez. 2017. "Effects of solids concentration on gas dispersion in industrial mechanical cells." Minerals & Metallurgical Processing 34, no. 1: 30-35.
This study presents an analysis of magnetic susceptibility and natural gamma radioactivity as indirect indicators of impurities in Cretaceous limestones of the Sabinas basin, as well as of the possible relation of these physical properties with the changes in the sedimentation environment. Both of these physical properties indicate changes in the degree of impurities and the mineralogical composition of this rock, principally in its organic matter and detritus content. Considering that the sedimentation environment determines the impurities in these rocks, possible environmental conditions at different levels of the Cretaceous were suggested using the magnetic susceptibility, total gamma radiation and potassium values, as well as the uranium and thorium concentration in the limestones. The analyses suggest variations in the depth of water table of the basin, which are mainly related to transgressions and marine regressions.
José Alberto Batista Rodríguez; Joaquín A. Proenza Fernández; G.I. Dávila-Pulido; Mitzué Garza García; Itzayana Y. Zamora Medellín. Magnetic Susceptibility and Natural Gamma Radioactivity as Indirect Indicators of Impurities in Limestones of the Sabinas Basin: Possible Relationships with the Sedimentation Environment. Journal of Geoscience and Environment Protection 2017, 05, 77 -91.
AMA StyleJosé Alberto Batista Rodríguez, Joaquín A. Proenza Fernández, G.I. Dávila-Pulido, Mitzué Garza García, Itzayana Y. Zamora Medellín. Magnetic Susceptibility and Natural Gamma Radioactivity as Indirect Indicators of Impurities in Limestones of the Sabinas Basin: Possible Relationships with the Sedimentation Environment. Journal of Geoscience and Environment Protection. 2017; 05 (10):77-91.
Chicago/Turabian StyleJosé Alberto Batista Rodríguez; Joaquín A. Proenza Fernández; G.I. Dávila-Pulido; Mitzué Garza García; Itzayana Y. Zamora Medellín. 2017. "Magnetic Susceptibility and Natural Gamma Radioactivity as Indirect Indicators of Impurities in Limestones of the Sabinas Basin: Possible Relationships with the Sedimentation Environment." Journal of Geoscience and Environment Protection 05, no. 10: 77-91.
G.I. Dávila-Pulido; A. Uribe-Salas; M. Álvarez-Silva; Felipe López. The role of calcium in xanthate adsorption onto sphalerite. Minerals Engineering 2015, 71, 113 -119.
AMA StyleG.I. Dávila-Pulido, A. Uribe-Salas, M. Álvarez-Silva, Felipe López. The role of calcium in xanthate adsorption onto sphalerite. Minerals Engineering. 2015; 71 ():113-119.
Chicago/Turabian StyleG.I. Dávila-Pulido; A. Uribe-Salas; M. Álvarez-Silva; Felipe López. 2015. "The role of calcium in xanthate adsorption onto sphalerite." Minerals Engineering 71, no. : 113-119.
G.I. Dávila-Pulido; A. Uribe-Salas. Effect of calcium, sulphate and gypsum on copper-activated and non-activated sphalerite surface properties. Minerals Engineering 2014, 55, 147 -153.
AMA StyleG.I. Dávila-Pulido, A. Uribe-Salas. Effect of calcium, sulphate and gypsum on copper-activated and non-activated sphalerite surface properties. Minerals Engineering. 2014; 55 ():147-153.
Chicago/Turabian StyleG.I. Dávila-Pulido; A. Uribe-Salas. 2014. "Effect of calcium, sulphate and gypsum on copper-activated and non-activated sphalerite surface properties." Minerals Engineering 55, no. : 147-153.
G. I. Davila-Pulido. Revisiting the Chemistry and Kinetics of Sphalerite Activation with Cu(II): A Contact Angle Study. The Open Mineral Processing Journal 2012, 5, 1 -5.
AMA StyleG. I. Davila-Pulido. Revisiting the Chemistry and Kinetics of Sphalerite Activation with Cu(II): A Contact Angle Study. The Open Mineral Processing Journal. 2012; 5 (1):1-5.
Chicago/Turabian StyleG. I. Davila-Pulido. 2012. "Revisiting the Chemistry and Kinetics of Sphalerite Activation with Cu(II): A Contact Angle Study." The Open Mineral Processing Journal 5, no. 1: 1-5.
The depressant action of sulfite and metabisulfite (MBS) for copper-activated sphalerite has been studied in the absence and presence of sodium isopropyl xanthate (SIPX) under both air and nitrogen atmospheres by using the contact angle technique. Results obtained indicate that MBS is a better depressant of sphalerite in the presence and absence of SIPX under both air and nitrogen atmospheres. The simultaneous presence of dissolved oxygen and bisulfate presumably promotes their synergetic action on sphalerite depression. Results corroborate the beneficial effect of using an aeration stage before collector addition in order to maximize the depressant action over the hydrophobizing species present on the sphalerite surface and to avoid xanthate oxidation.
G.I. Dávila-Pulido; A. Uribe-Salas; R. Espinosa-Gómez. Comparison of the depressant action of sulfite and metabisulfite for Cu-activated sphalerite. International Journal of Mineral Processing 2011, 101, 71 -74.
AMA StyleG.I. Dávila-Pulido, A. Uribe-Salas, R. Espinosa-Gómez. Comparison of the depressant action of sulfite and metabisulfite for Cu-activated sphalerite. International Journal of Mineral Processing. 2011; 101 (1-4):71-74.
Chicago/Turabian StyleG.I. Dávila-Pulido; A. Uribe-Salas; R. Espinosa-Gómez. 2011. "Comparison of the depressant action of sulfite and metabisulfite for Cu-activated sphalerite." International Journal of Mineral Processing 101, no. 1-4: 71-74.
G. I. Dávila Pulido; A. Uribe Salas. Estudio de los mecanismos de activación de la esfalerita con Cu(II) y Pb(II). Revista de Metalurgia 2011, 47, 329 -340.
AMA StyleG. I. Dávila Pulido, A. Uribe Salas. Estudio de los mecanismos de activación de la esfalerita con Cu(II) y Pb(II). Revista de Metalurgia. 2011; 47 (4):329-340.
Chicago/Turabian StyleG. I. Dávila Pulido; A. Uribe Salas. 2011. "Estudio de los mecanismos de activación de la esfalerita con Cu(II) y Pb(II)." Revista de Metalurgia 47, no. 4: 329-340.