cdocastMetal granulator with medium frequency induction heating technology
CDOCAST metal granulators combine induction melting, controlled bottom discharge and water cooling to produce gold, silver, K-gold, copper, brass and bronze granules. Six standard models cover gold capacities from 2 kg to 100 kg per batch.
A metal granulator is an induction-heated metal grain making machine that converts molten gold, silver, copper or precious metal alloys into smaller grains for refining, remelting, alloy preparation and jewelry production. The integrated system combines a melting furnace, graphite crucible, bottom-discharge nozzle, stopper rod, cooling-water tank and grain collection basket.
During operation, the induction furnace melts the charge and the stopper rod controls flow through the crucible opening. Molten droplets fall into cooling water and solidify into metal granules. For a gold granulator machine or silver granulation machine, the finished grain size and surface depend on alloy fluidity, temperature, nozzle-hole diameter, discharge rate and cooling conditions. Inert-gas, stirring and vacuum configurations are available when oxidation or alloy separation requires additional control.
Each machine configuration is shown with its corresponding product image and operation video.
A stainless-steel cooling and collection tank for workshops that already have suitable melting equipment. Molten metal is discharged into the water tank for rapid cooling and grain formation.
The CDO-MG05 and CDO-MG10 combine induction melting and granulation in a compact frame for laboratories, jewelry workshops and small precious metal recycling operations.
The CDO-MG25 uses an enclosed melting and granulation arrangement with inert-gas protection for regular refinery and precious metal recovery production.
A mechanical stirring unit helps maintain a more uniform molten mixture when processing K-gold, sterling silver and other multi-component alloys before granulation.
This industrial configuration uses controlled bottom discharge and a larger water tank. A lifting collection basket can simplify drainage and finished-grain removal.
The platform arrangement positions the melting unit above a deep granulation tank so molten metal can discharge by gravity. It is intended for large refinery layouts and high batch throughput.
A sealed vacuum configuration is available for alloys that require stronger oxygen control than standard inert-gas protection, including compositions containing oxidation-sensitive elements.
Compare power, capacity, cycle time, dimensions and weight across the six standard gravity-granulation models.
| Parameter | CDO-MG05 | CDO-MG10 | CDO-MG25 | CDO-MG35 | CDO-MG45 | CDO-MG55 |
|---|---|---|---|---|---|---|
| Power | 12 kW | 15 kW | 18 kW | 35 kW | 45 kW | 55 kW |
| Voltage | 380 V (220 V), 3 phase, 50/60 Hz | 380 V (220 V), 3 phase, 50/60 Hz | 380 V, 3 phase, 50/60 Hz | 380 V, 3 phase, 50/60 Hz | 380 V, 3 phase, 50/60 Hz | 380 V, 3 phase, 50/60 Hz |
| Applicable metals | Gold, K-gold, silver, copper, brass and bronze | |||||
| Maximum temperature | 1600°C | 1600°C | 1600°C | 1600°C | 1600°C | 1600°C |
| Melting time | 2–5 min | 2–5 min | 5–8 min | 10–15 min | 10–20 min | 20–30 min |
| Granulating time | About 5 min | About 5 min | About 10 min | About 15 min | About 20 min | About 30 min |
| Casting method | Gravity | Gravity | Gravity | Gravity | Gravity | Gravity |
| Maximum gold capacity | 2 kg | 4 kg | 6–12 kg | 40 kg | 60 kg | 100 kg |
| Maximum silver capacity | 1 kg | 2 kg | 3–6 kg | 20 kg | 30 kg | 50 kg |
| Overall dimensions | 1000 × 500 × 965 mm | 1000 × 500 × 965 mm | 1150 × 500 × 1100 mm | 1610 × 1550 × 1930 mm | 1610 × 1550 × 1930 mm | 1610 × 1550 × 1930 mm |
| Machine weight | 150 kg | 150 kg | 270 kg | 600 kg | 700 kg | 750 kg |
The melting, flow-control, cooling and collection components operate as one production system.
Medium-frequency induction heating melts the charge inside the graphite crucible and supports temperature control up to the stated 1600°C maximum.
The bottom opening and stopper-rod mechanism control molten-metal discharge. Nozzle hole number and diameter are selected according to material fluidity and target grain size.
Argon or nitrogen can protect the melting and discharge area to reduce oxygen contact during gold, silver and alloy granulation.
Molten droplets solidify in cooling water. The collection arrangement allows the finished metal grains to be removed after the cycle.
Functions relevant to precious metal refining, recycling, alloy preparation and jewelry production.
The induction furnace and water-granulation components are matched as one compact system.
The stopper rod controls discharge from the bottom of the graphite crucible into the cooling zone.
Inert-gas, stirring and vacuum configurations can be selected according to pure metal or alloy requirements.
Six models cover small laboratory batches through 100 kg gold refinery production.
Finished grain appearance from a gold, copper or silver granulation machine depends on alloy fluidity, temperature, nozzle geometry, discharge rate and cooling conditions.
Discharge hole geometry and alloy fluidity influence grain diameter and surface appearance.
Temperature, inert-gas protection and water conditions should be matched to the silver alloy.
Higher oxidation sensitivity may require stronger atmosphere control and process adjustment.
Download the product catalog, then send the metal type, batch weight, target grain size, voltage and required protection method.
Use these CDOCAST buyer guides and technical articles to compare material behavior, granule quality, machine structure and downstream applications.
Learn how temperature, water conditions, discharge flow and crucible-hole design affect the finished grains.
Karat GoldHow are K-gold granules different from pure gold?Compare alloy fluidity, oxidation behavior, stopper-rod use and graphite crucible hole configuration.
Gold and SilverHow are high-quality gold and silver granules produced?Review material preparation, induction melting, granulation, cooling, collection and machine-selection factors.
Machine SelectionWhich metal granulating machine configuration is suitable?Compare the separate tank, compact machine, enclosed system, vacuum granulator and larger refinery layouts.
System LayoutIntegrated or platform silver granulator?Understand the differences in footprint, production capacity, installation and high-volume silver processing.
Downstream UseWhy prepare granules before vacuum gold bar casting?See how clean, easy-to-weigh grains fit into a complete bullion casting, logo pressing and marking workflow.
Technical answers retained from the original product page and organized for easier mobile reading.
Service life varies with material, temperature, operating practice and cleaning:
Send CDOCAST the metal or alloy, batch weight, starting form, target grain diameter, required production rate and local voltage. The technical team can match the application to a standard, stirring or vacuum-protected granulator.
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