Copper electrorefining is an electrochemical process to upgrade crude copper and copper-containing scrap into high-purity cathode copper. For precious metal recycling plants, this process serves as a key step: while refining copper, gold, silver, palladium, platinum and other precious metals are concentrated in anode slime, bringing extra revenue for your recycling project.
Working Principle
Inside the electrolytic cell, crude copper acts as the anode, while pure copper starter sheets or stainless steel plates work as the cathode. Copper sulfate-sulfuric acid solution is adopted as electrolyte. When direct current is applied, copper on the anode is oxidized and dissolved into electrolyte as copper ions. Reactive impurities dissolve into the solution together. Precious metals such as gold and silver will not dissolve and fall off to form anode slime. Copper ions migrate toward the cathode and are reduced into pure metallic copper. This achieves effective separation between copper, base impurities and precious metals.
Electrolyte Selection
The electrolyte is critical for stable operation. Our standard electrolyte system is copper sulfate with sulfuric acid. It maintains proper copper ion concentration to form smooth cathode copper. Impurity level must be strictly controlled to avoid co-deposition and poor copper quality. Our supporting electrolyte circulation and filtration system stabilizes solution composition, cuts waste liquid discharge and reduces operating cost.
Precise Control of Electrolysis Parameters
The quality of cathode copper and current efficiency depend heavily on process control. Our complete copper electrolysis equipment is equipped with intelligent control modules:
- Current density & cell voltage: The DC power unit accurately controls dissolving rate at anode and copper deposition speed at cathode, preventing nodulation and loose copper deposits.
- Temperature & electrolyte circulation: Integrated heating and circulating system keeps uniform ion distribution in cells. Improper temperature and flow rate will cause local overheating and poor copper crystal. Our automatic circulation & temperature control system supports continuous stable operation.
Further Purification & Precious Metal Recovery
Copper cathode from electrorefining can reach purity up to 99.99%, meeting LME grade requirements. For ultra-high purity copper, follow-up pyrometallurgical refining can be connected.
Key Advantage for Recyclers: Anode slime collected from electrolysis cells is rich in precious metals. Our system is fitted with dedicated anode slime collection units. After copper refining, gold, silver and platinum-group metals can be extracted from anode slime, creating extra profit from your copper scrap feedstock.
Our Copper Electrorefining Equipment
We are a professional manufacturer of precious metal & non-ferrous metal recycling machinery. We supply modular turnkey copper electrorefining lines, from lab-scale test units to full industrial production plants. A full set includes electrolytic cells, high-frequency rectifier, electrolyte filtration & circulation system, temperature control unit and anode slime recovery assembly.
✅ Modular structure, easy installation, flexible capacity customization
✅ Intelligent control system for stable process and high-purity copper output
✅ Efficient anode slime capture, high precious metal recovery rate
✅ Anti-corrosion cell tank, low maintenance & solution recycling
✅ Full service: process design, fabrication, on-site commissioning & technical training
Our systems are widely used for recycling PCB scrap, waste copper, copper smelting intermediates and copper-bearing precious metal alloys. Realize integrated copper purification + precious metal recovery.
Contact us for customized process proposal and quotation for your copper recycling project.
