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Precious Metal Electrolytic Refining Equipment is a widely used method for purifying precious metals, such as gold, silver, and platinum, by passing an electric current through a solution containing dissolved impure metal. The anode (impure metal) oxidizes, releasing metal ions into the electrolyte, while the cathode (pure metal) attracts and reduces these ions, forming high-purity deposits. Impurities either remain in solution or settle as anode slime. This process ensures high efficiency and ultra-high purity (up to 99.99%), making it essential in jewelry, electronics, and industrial applications. Common electrolytes include cyanide, sulfuric acid, or chloride solutions, depending on the target metal.
Advantage: Environmentally friendly, no chemical gas produced. Easy operation, Low production cos, thigh recovery rate. The product quality is stable and can reach 99.99%.
Notice: The plating solution needs to be changed in time. Slow speed, long working time and more power consumption.
The electrolytic method is used for high-purity refining, especially for gold and silver.
Process Steps:
1.Anode Preparation: Impure metal (e.g., crude gold) is cast into an anode.
2.Electrolyte Solution: A conductive solution (e.g., gold chloride (AuCl₃) for gold refining) is prepared.
3.Electrolysis:
Anode (+) dissolves impure metal.
Cathode (-) attracts pure metal ions, depositing 99.9%+ pure metal.
4.Recovery: The cathode is removed, and the refined metal is melted.
For more details on gold refining, please click this link to visit the Gold Refining Blog
For more details on silver refining, please click this link to visit the Silver Refining Blog .
If you want to pulverize gold or silver materials into flake for purification, you can click this link to learn about CDOCAST Metal Flake Making Machine
Gold Electrolytic Refining Equipment
Silver Electrolytic Refining Equipment
Silver Electrolytic Refining Equipment Layout( Can be customized)
Application
| Feature | Aqua Regia Method | Electrolysis Method |
| Process Type | Chemical dissolution | Electrochemical process |
| Chemicals Used | HNO₃ + HCl (3:1 ratio) | Acidic/alkaline electrolyte (e.g., H₂SO₄) |
| Suitable Metals | Au, Pt, Pd | Au, Ag, Pt (varies by setup) |
| Purity Achievable | 99.5%-99.99% | 99.9%-99.999% |
| Speed | Fast (hours) | Slow (days for large batches) |
| Energy Consumption | Low (room temp.) | High (requires electricity) |
| Waste Production | Toxic fumes (NOx, Cl₂), acidic waste | Less chemical waste, metal sludge |
| Safety Concerns | Highly corrosive, toxic gases | Electrical hazards, electrolyte handling |
| Equipment Cost | Low (glassware, fume hood) | High (power supply, specialized cells) |
| Scalability | Suitable for small-medium batches | Better for industrial-scale production |
| Byproduct Recovery | Requires additional steps | Easier (e.g., anode slime collection) |
| Skill Requirement | Moderate (acid handling experience) | High (electrochemistry knowledge) |
1.High Purity – Produces metals up to 99.99% purity (e.g., silver and gold electrolysis).
2.Scalability – Ideal for large-scale operations (e.g., industrial gold/silver refining).
3.Less Chemical Waste – Reduces reliance on acids like aqua regia, minimizing environmental impact.
4.Automation-Friendly – Continuous processing with minimal manual intervention.
CDOCAST Provide 2 Warranty time , and during the warranty time we will be responsible for the all aftersales service & spare parts for free
CDOCAST Provide more value & turnkey Solution to Metal Melting & Casting According to Each Customer
We owe it to each of our customers, CDOCAST adopt world famous brand components to improve our machine working performance.
Inquiry About CDOCAST Precious Metal Electrolytic Refining Equipment
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