Influence of oxygen reduction and hydrogen evolution in the gold and silver direct electrodeposition process from thiourea solutions in a filter press type reactor

Díaz, M. Elena Poisot; Alonso, Alejandro R.; González, Ignacio; Lapidus, G.T.

doi:10.1016/j.hydromet.2012.09.006

Cited by 13 publications

(6 citation statements)

References 8 publications

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“…The global desorption properties (with appropriate sonication and optimum selection of TU concentration) offer very promising performances for efficient sorption and sorbent recycling. Metal can then be valorized by electrodeposition from the thiourea eluate [13,85].…”

Section: Metal Desorption and Sorbent Recyclingmentioning

confidence: 99%

2-Mercaptobenzimidazole derivative of chitosan for silver sorption – Contribution of magnetite incorporation and sonication effects on enhanced metal recovery

Elwakeel

Al‐Bogami

Guibal

2021

Chemical Engineering Journal

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Section: Metal Desorption and Sorbent Recyclingmentioning

confidence: 99%

2-Mercaptobenzimidazole derivative of chitosan for silver sorption – Contribution of magnetite incorporation and sonication effects on enhanced metal recovery

Elwakeel

Al‐Bogami

Guibal

2021

Chemical Engineering Journal

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“…However, the adsorption of gold on silica or pyrite is possible. 10,24 A mineral separation, in turn a mineral identification using an optical microscope for the original gold ore, was conducted. It was found that a large amount of native gold (Au 0 ) was found in the sample with a particle size fraction of 49−74 μm.…”

Section: Industrial and Engineering Chemistry Researchmentioning

confidence: 99%

“…1,8 Thiourea as a new type of noncyanide reagent has received extensive attention. 9,10 Other alternatives included some halide solutions with some appropriate oxidizing agents. 11 One of the strongest oxidizing agents for this system is chlorine.…”

Section: Introductionmentioning

confidence: 99%

“…For these reasons, considerable efforts have been made to find an alternative to cyanide. A variety of nontoxic and noncorrosive gold extraction processes have been studied for this purpose. ,− Thiosulfate was found to undergo disproportionation or oxidation in aqueous solutions, forming various other sulfur species including sulfite, sulfate, and di-, tri-, and higher polythionate during the leaching process, thus resulting in an excessive consumption, and accordingly it was found that it was very difficult to find an operable regime. , Thiourea as a new type of noncyanide reagent has received extensive attention. , Other alternatives included some halide solutions with some appropriate oxidizing agents . One of the strongest oxidizing agents for this system is chlorine.…”

Section: Introductionmentioning

confidence: 99%

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Fast and Effective Gold Leaching from a Desulfurized Gold Ore Using Acidic Sodium Chlorate Solution at Low Temperature

Cheng

Shen

Zhang

et al. 2013

Ind. Eng. Chem. Res.

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The effects of various leaching conditions for gold extraction from sulfur-containing gold ore using acidic sodium chlorate solution were investigated. The contents of gold and sulfur from the ore were 55.7 g/ton and 11.67 wt %, respectively. It was found that the presence of sulfur greatly inhibited gold extraction. The optimal desulfurization temperature, desulfurization time, leaching temperature, leaching time, adding rate of NaClO 3 , HCl concentration, weight ratio of NaCl to sample, agitation speed, and ratio of liquid lixiviant volume to solid sample weight were 650 °C, 2 h, 40 °C, 45 min, 0.25 mL/min, 3 M HCl, 0.2, 250 rpm, and 10, respectively. The gold extraction percentage and the weight loss percentage of the sample were 97% and 8.8%, respectively, under these optimal conditions. Gold leaching by this method was very fast and effective, and the temperature was low. These characteristics made it possible to apply this method in continuous operation mode in industry.

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“…Several works have developed the technology for the recovery of Cu, Au, Ag, Pb, Zn, and Mn from batteries, computers, cell phones, electronic cards, and mine tailings by hydrometallurgical and electro-reduction processes (Alonso et al 2004, Poisot-Díaz et al 2008, 2012. The results show a clear advantage in the selectivity; however, the principal condition is that the electro-reduction potential must be quite separated.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic and Electrochemical Study of Vanadium Solutions: Towards Vanadium Recovery From a Spent Catalyst

Antaño-López¹,

Hernández-Pérez²,

Espejel‐Ayala³

2021

RICA

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Due to the low abundance of vanadium in nature (about 135 g/t), the feasibility to recover it from industrial wastes has highly attracted scientific and technological attention. The main recovery routes reported are associated with chemical or thermochemical processes. However, the electrochemical recovery of vanadium from industrial wastes has been poorly investigated. In this work, a thermodynamic and electrochemical study for the possible vanadium recovery from a spent catalyst generated in the petrochemical industry was conducted. The study was divided into two stages using low vanadium concentrations. In the first stage, the recovery of vanadium was possible in its V4+ state at low reduction potentials, whereas for the second stage, cyclic voltammetry was used to calculate the diffusion coefficient and the heterogeneous velocity coefficient of the V5+/V4+ redox pair. The obtained values are similar to those reported in the literature for aqueous solutions at high vanadium concentrations and would allow the design of the system at large scale. This report aims to set the conditions for the possible vanadium recovery from a spent catalyst by means of electrochemical processes, although the optimization of such conditions must be further explored.

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Influence of oxygen reduction and hydrogen evolution in the gold and silver direct electrodeposition process from thiourea solutions in a filter press type reactor

Cited by 13 publications

References 8 publications

2-Mercaptobenzimidazole derivative of chitosan for silver sorption – Contribution of magnetite incorporation and sonication effects on enhanced metal recovery

2-Mercaptobenzimidazole derivative of chitosan for silver sorption – Contribution of magnetite incorporation and sonication effects on enhanced metal recovery

Fast and Effective Gold Leaching from a Desulfurized Gold Ore Using Acidic Sodium Chlorate Solution at Low Temperature

Thermodynamic and Electrochemical Study of Vanadium Solutions: Towards Vanadium Recovery From a Spent Catalyst

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