Electrochemical Processing of Copper Refining Systems

Electrochemical copper refining harnesses controlled redox reactions to convert impure blister copper into high-purity metal, chiefly through electrorefining and electrowinning techniques. In electrorefining, impure copper anodes dissolve in a sulphuric acid–copper(II) electrolyte under an applied current, while pure copper plates onto cathodes. Electrowinning, by contrast, deposits copper directly from spent or recycled electrolytes. Critical parameters include electrolyte composition (acid concentration, copper and impurity levels), current density, temperature and hydrodynamics. Advances in cell design, membrane integration and dynamic control strategies aim to reduce specific energy consumption and enhance current efficiency, while novel approaches to impurity removal—such as reactive electro-membranes and targeted antimony recovery—support environmental and economic goals. Process modelling, from ion‐transport simulations to dynamic semi-empirical frameworks, provides predictive capability for scale-up and real-time control. Together, these developments underpin the global copper industry’s drive towards sustainable, cost-effective production that meets stringent purity standards for electrical, electronic and renewable energy applications.

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Research from all publishers

Recent experimental work has revealed that copper anode dissolution in concentrated sodium chloride media exhibits an inverse Arrhenius relationship, with dissolution rates decreasing as temperature rises from ambient to 100 °C. The study attributes this counter-intuitive trend to shifts in average copper-ion charge states within the electrolyte and proposes a mathematical framework for predicting ion distribution and current response under high current densities.

A dynamic semi-empirical model has been developed to simulate industrial electrowinning operations, integrating bench-scale data on copper yield, current efficiency and specific energy consumption. By incorporating step and pulse disturbances in electrolyte composition and flow, the model offers a foundation for real-time process monitoring, operator training and advanced control strategies aimed at optimising energy usage and product quality.

Investigation into anode slime detachment and flow dynamics in high-nickel electrorefining cells has improved understanding of slime layer porosity and adhesion. Fluid-dynamic experiments demonstrate how slime morphology and electrolyte flow influence impurity distribution and sludge removal, informing cell design adjustments to mitigate blockages and maintain consistent current efficiency over extended operations.

Electrochemical Processing of Copper Refining Systems publication trend

The graph below shows the total number of articles in electrochemical processing of copper refining systems across all publications each year (not limited to Nature Index journals).

Technical terms

Electrorefining: A process in which impure copper anodes dissolve under an applied current and pure copper plates onto cathodes within an acidic copper(II) electrolyte.

Electrowinning: Direct electrodeposition of copper from a copper-bearing solution, often used to recover metal from spent electrolytes.

Current density: The electric current per unit electrode area, a key parameter controlling deposition rate and morphology.

Current efficiency: The ratio of actual metal deposited to the theoretical amount predicted by Faraday’s law, reflecting losses to side reactions.

Specific energy consumption: The electrical energy required to produce a unit mass of copper, typically expressed in kWh kg⁻¹.

Anode slime: Insoluble impurities (oxides, hydroxides, metal sulphides) that detach from the anode and settle, often containing valuable by-product metals.

References

1. Rates of cylindrical and spherical copper anodes dissolving into concentrated NaCl water solution calculation during electrolysis and temperature increasing. International Journal of Thermofluids (2024).
2. Development of a Dynamic Semi-empirical Model for Simulation of Copper Electrowinning Processes. JOM (2024).
3. Detachment and flow behaviour of anode slimes in high nickel copper electrorefining. Physicochemical Problems of Mineral Processing (2024).
4. Antimony recovery from copper refining electrolyte by membrane electrolysis. REM - International Engineering Journal (2025).
5. Recovering Scrap Anode Copper Using Reactive Electrodialysis. American Journal of Analytical Chemistry (2014).