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CDOCAST aqua regia refining equipment is an engineered chemical refining system for recovering and purifying gold from suitable gold-bearing feed. According to feed assay and project requirements, a customized route may also be developed for selected platinum- and palladium-bearing materials.
The complete project can integrate acid-resistant reaction vessels, solid-liquid filtration, selective recovery, product washing, off-gas collection and scrubbing, wastewater handling, drying, melting and final casting. Equipment selection is based on the actual feed composition—not on a universal model table.
Clear process boundaries prevent the wrong equipment from being selected for silver-rich, high-grade gold or complex mixed feed.
Every quotation should begin with representative assay data and a clear material description.
Examples can include jewelry scrap, gold alloy, granules, clean production scrap, anode slime or certain precious-metal powders. Pretreatment may be required to remove oil, organics, base metals, moisture or other contaminants.
Silver behaves differently in chloride media and may form insoluble silver chloride. A high-silver feed normally requires a separate pretreatment or a dedicated silver electrolysis route; it should not be described as being refined together with gold in one simple step.
Selected Pt/Pd-bearing feed may use a customized chemical recovery route, but dissolution behavior and selective separation differ from gold. CDOCAST must review the assay, matrix, impurities and intended products before confirming the process.
E-waste, catalysts, ore concentrates and mixed residues can contain hazardous or process-disrupting elements. They require specialist sampling, pretreatment and environmental review and cannot be quoted reliably from a photo alone.
Important: reported final purity depends on feed composition, sampling accuracy, process control, separation efficiency, washing, contamination control and downstream melting. Purity should be verified by appropriate laboratory analysis.
The final system is configured around the material route, available utilities, local regulations and plant layout.
This overview explains the system function without replacing a site-specific process design, risk assessment or operating procedure.
Characterize precious metals, base metals, contaminants, moisture and physical form.
Clean, sort, size or granulate the feed where the approved process requires it.
Process the qualified feed in a controlled, ventilated and acid-resistant reactor.
Separate insoluble residue and retain samples for material-accounting checks.
Prepare the pregnant solution for the confirmed selective recovery route.
Recover the target precious metal under controlled process conditions.
Wash and dry the recovered product, then verify quality with suitable analysis.
Melt qualified product and cast it into grain, bars or the required intermediate form.
These are engineering references from previous CDOCAST project quotations. They show how reactor trains and pollution-control scope change with project scale; they are not universal model packages or guaranteed daily outputs.
Capacity definition matters: a “3 kg”, “10 kg” or “100 kg” project label does not by itself mean kilograms per batch or kilograms per day. Usable feed mass and cycle count depend on feed assay and density, silver/base-metal content, required liquid volume and freeboard, reaction and filtration time, washing/drying time, staffing, utilities and permit limits. CDOCAST confirms the design basis in the signed technical proposal.
Aqua regia processing can release corrosive acid mist and hazardous reactive gases, including nitrogen oxides and chlorine-containing vapors. Pollution control is therefore part of the process system—not an optional accessory.
Site responsibility: final engineering must address ventilation, emergency response, chemical storage, compatible materials, secondary containment, PPE, operator training and all applicable environmental and occupational-safety regulations. Do not scale or operate a refining process from website text alone.
Aqua regia, gold electrolysis and silver electrolysis are complementary technologies—not interchangeable names for the same machine.
| Feed / Objective | Typical Route to Evaluate | Selection Note |
|---|---|---|
| Gold-bearing scrap or alloy | Aqua regia chemical refining | Confirm gold, silver, PGM and base-metal content before designing pretreatment and recovery. |
| High-grade gold requiring electrolytic purification | Gold electrolysis | Feed must meet the electrolysis system's anode and impurity requirements. |
| Silver-rich alloy or crude silver | Dedicated silver refining / electrolysis | Do not assume silver will follow the same chloride-solution route as gold. |
| Pt/Pd-bearing material | Customized hydrometallurgical route | Requires detailed assay, matrix review and selective separation design. |
| Unknown mixed residue or e-waste | Sampling, pretreatment and pilot study first | A universal off-the-shelf promise is technically unreliable and may be unsafe. |
Illustrative arrangements are shown below. Final vessel sizes, piping, platforms, scrubbers and utility interfaces are project-specific.
Send the following data so the proposed system reflects your actual material and local plant conditions.
Build a complete precious-metal line only from equipment that matches the confirmed material route.
Gold refinery equipment guide
Silver refinery equipment guide
Precious metal electrolytic refining equipment
Metal granulator
Gold melting machine
Vacuum gold bar making machine
Concise answers to common technical and purchasing questions.
Suitable feed may include certain gold-bearing jewelry scrap, alloys, granules, clean process scrap and powders. CDOCAST must review a representative assay, physical form, contaminants and target products before confirming the process and equipment.
Not as a simple combined route. Silver can form insoluble silver chloride in chloride media, so silver-rich material usually needs pretreatment or a separate silver refining and electrolysis process. The correct route depends on the assay and material matrix.
Selected Pt/Pd-bearing materials may be processed with a customized hydrometallurgical route, but their dissolution and selective separation differ from gold. A detailed assay and process review are required.
Final purity cannot be guaranteed from equipment name alone. It depends on feed composition, pretreatment, separation control, washing, contamination prevention, operator procedures and verification by laboratory analysis.
Aqua regia processing can generate acid mist, nitrogen oxides and chlorine-containing vapors. Enclosed extraction, mist separation and correctly engineered gas scrubbing are necessary to reduce exposure and meet applicable discharge requirements.
Wastewater collection and treatment can be included in the project scope. The design depends on liquid-stream composition, expected volume, local discharge standards and whether additional precious-metal recovery is required before neutralization.
Not automatically. These labels are reference project sizes, while actual batch mass and daily cycles depend on the confirmed feed, process liquid volume, reactor freeboard, filtration time, washing and drying, utilities, staffing and local permit limits. The signed technical proposal must state the design basis and included environmental scope.
Provide a representative assay, material description, batch capacity, production schedule, desired products and purity, plant dimensions, utilities and local environmental requirements. Photos are helpful but cannot replace assay data.
Send CDOCAST your material analysis, batch requirement, target products and site conditions. We will evaluate whether aqua regia, electrolysis, pretreatment or a combined refining route is appropriate.
Gold and Silver Aqua Regia Refining Equipment
Platinum and Palladium Aqua regia refining Equipment
Gold Aqua Ragia refining Equipment layout (Can be customized)
Application
1.High Efficiency – Effectively dissolves gold, platinum, and palladium, even in small quantities.
2.Versatility – Suitable for refining scrap jewelry, electronic waste, and industrial catalysts.
3.Precision – Allows selective precipitation of pure metals (e.g., gold can be isolated using reducing agents like sodium metabisulfite).
4.Cost-Effective – Lower initial setup cost compared to electrolytic systems.