Modelling of silver anode dissolution and the effect of gold as impurity under simulated industrial silver electrorefining conditions

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@article{bb8984cf9cf84a3fbbe0439913a7dac4,
title = "Modelling of silver anode dissolution and the effect of gold as impurity under simulated industrial silver electrorefining conditions",
abstract = "As Au content causes passivation during silver electrorefining process, a kinetic study and modelling of Au–Ag alloy in synthetic silver electrolyte is presented. In this research, the possibility to process high gold Dor{\'e} efficiently through the simple adjustment of electrolyte conditions and the process current density is demonstrated. Measurements of binary Au–Ag alloys in a synthetic silver electrolyte with silver concentration ([Ag+]) of 40, 70 and 100 g/dm3 were conducted at temperatures between 25 and 45 °C. Results show that efficient processing of Dor{\'e} with a higher gold content up to 20{\%} can be achieved in a low [Ag+] (40 g/dm3) electrolyte with a current density (j) of 180–300 A/m2. For an intermediate electrolyte with [Ag+] of 70 g/dm3, for Au limit of 13–14{\%}, the current density can be increased to j of 500–600 A/m2, for a Au content of 13–14{\%}. Finally, using high concentration electrolyte of [Ag+] = 100 g/dm3, a high current density ˃1000 A/m2 can only be efficiently applied when Au content is limited to 6–8{\%}. Based on empirical kinetic modelling, this study shows an effective approach on the processing Dor{\'e} with wide range of Au content.",
keywords = "Au – Ag alloy, Cyclic polarization, Kinetic modelling, Passivation, Silver electrorefining",
author = "Aji, {Arif T.} and Petteri Halli and Amaury Guimont and Wilson, {Benjamin P.} and Jari Aromaa and Mari Lundstr{\"o}m",
year = "2019",
month = "7",
day = "15",
doi = "10.1016/j.hydromet.2019.105105",
language = "English",
volume = "189",
journal = "Hydrometallurgy",
issn = "0304-386X",
publisher = "Elsevier Science B.V.",

}

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TY - JOUR

T1 - Modelling of silver anode dissolution and the effect of gold as impurity under simulated industrial silver electrorefining conditions

AU - Aji, Arif T.

AU - Halli, Petteri

AU - Guimont, Amaury

AU - Wilson, Benjamin P.

AU - Aromaa, Jari

AU - Lundström, Mari

PY - 2019/7/15

Y1 - 2019/7/15

N2 - As Au content causes passivation during silver electrorefining process, a kinetic study and modelling of Au–Ag alloy in synthetic silver electrolyte is presented. In this research, the possibility to process high gold Doré efficiently through the simple adjustment of electrolyte conditions and the process current density is demonstrated. Measurements of binary Au–Ag alloys in a synthetic silver electrolyte with silver concentration ([Ag+]) of 40, 70 and 100 g/dm3 were conducted at temperatures between 25 and 45 °C. Results show that efficient processing of Doré with a higher gold content up to 20% can be achieved in a low [Ag+] (40 g/dm3) electrolyte with a current density (j) of 180–300 A/m2. For an intermediate electrolyte with [Ag+] of 70 g/dm3, for Au limit of 13–14%, the current density can be increased to j of 500–600 A/m2, for a Au content of 13–14%. Finally, using high concentration electrolyte of [Ag+] = 100 g/dm3, a high current density ˃1000 A/m2 can only be efficiently applied when Au content is limited to 6–8%. Based on empirical kinetic modelling, this study shows an effective approach on the processing Doré with wide range of Au content.

AB - As Au content causes passivation during silver electrorefining process, a kinetic study and modelling of Au–Ag alloy in synthetic silver electrolyte is presented. In this research, the possibility to process high gold Doré efficiently through the simple adjustment of electrolyte conditions and the process current density is demonstrated. Measurements of binary Au–Ag alloys in a synthetic silver electrolyte with silver concentration ([Ag+]) of 40, 70 and 100 g/dm3 were conducted at temperatures between 25 and 45 °C. Results show that efficient processing of Doré with a higher gold content up to 20% can be achieved in a low [Ag+] (40 g/dm3) electrolyte with a current density (j) of 180–300 A/m2. For an intermediate electrolyte with [Ag+] of 70 g/dm3, for Au limit of 13–14%, the current density can be increased to j of 500–600 A/m2, for a Au content of 13–14%. Finally, using high concentration electrolyte of [Ag+] = 100 g/dm3, a high current density ˃1000 A/m2 can only be efficiently applied when Au content is limited to 6–8%. Based on empirical kinetic modelling, this study shows an effective approach on the processing Doré with wide range of Au content.

KW - Au – Ag alloy

KW - Cyclic polarization

KW - Kinetic modelling

KW - Passivation

KW - Silver electrorefining

UR - http://www.scopus.com/inward/record.url?scp=85070523956&partnerID=8YFLogxK

U2 - 10.1016/j.hydromet.2019.105105

DO - 10.1016/j.hydromet.2019.105105

M3 - Article

VL - 189

JO - Hydrometallurgy

JF - Hydrometallurgy

SN - 0304-386X

M1 - 105105

ER -

ID: 36172989