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Meeting 2021 TMS Annual Meeting & Exhibition
Symposium High Temperature Electrochemistry IV
Presentation Title Selective Extraction of Gold from Gold-copper Alloy Using Anodic Electrochemical Deposition in Molten Salt Electrolyte
Author(s) Takanari Ouchi, Shuang Wu, Toru H. Okabe
On-Site Speaker (Planned) Takanari Ouchi
Abstract Scope The main metal component of waste printed circuit boards (WPCBs) is copper. In industrial recycling processes of gold from WPCBs, electrorefining in the copper smelting process, or hydrometallurgical leaching process by using cyanide or aqua regia solution, are employed as representative recovery processes. Recycling gold is time-consuming and generates large amounts of hazardous waste. In this study, direct extraction process of gold directly from gold-copper alloy, which is simple and does not generate harmful wastes, was developed. This process is based on the anodic electrochemical deposition of gold from its anionic ions dissolved in a molten salt electrolyte. Gold in copper was alloyed with sodium, and was then dissolved in a molten salt. The electrochemical behaviors of gold anions in the molten salt were investigated to demonstrate that pure gold was selectively obtained via anodic deposition. This result indicate the validity of the developed process to recycle Au from WPCBs.
Proceedings Inclusion? Planned:
Keywords Electrometallurgy, Recycling and Secondary Recovery, Extraction and Processing

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

A Comparative Study of Working Electrode Materials for Voltammetry Measurements in LiCl–Li2O Salts
Advances in Solid Oxide Membrane Based Electrolysis for Solar-grade Silicon Deposition
Effect of Hydroxide and Oxide Impurities in Electrochemical Processes Using Molten LiCl and CaCl2
Electrochemical Reactions of Oxide Ions with Tungsten in Molten CaCl2
Feasibility of Potentiometry for Monitoring Activity of GdCl3 in Molten LiCl-KCl Salt
First-principles Molecular Dynamics and CALPHAD Modeling of the CaF2-MgF2-SiO2 Molten Salt System
Fundamental Challenges for the Development of Electrolytic Reduction of Uranium Oxide in Molten LiCl-Li2O
High-speed Electrodeposition of Textured Monolithic Lithiated Transition Metal Oxide Cathodes for Low Cost, High Energy, and Fast Charging Li-ion Batteries.
Interaction between Solute Species and Metallic Alloying Elements in Molten Chloride Systems
Investigation on Preparation of Fe-Al Alloys by Direct Reduction of Fe2O3-Al2O3 Powder in CaCl2-NaCl Molten Salt System
Liquid Bipolar Electrode for Extraction of Aluminium and PGM Concentrate from Spent Catalysts
Molten Hydroxide Mediated Electrosynthesis of Layered Transition Metal Oxides for Electrochemical Energy Storage
New Electrochemical Deoxidation Method of Ti Metal in Molten Salts Containing YCl3
Optimizing Reaction Selectivity in High Temperature Molten Electrolytes
Selective Extraction of Gold from Gold-copper Alloy Using Anodic Electrochemical Deposition in Molten Salt Electrolyte
Validated Modeling of Quartzite Reduction to Solar Silicon by Molten Salt Electrolysis

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