Key Benefits:
Longzhyi molten aluminum degassing systems are designed for efficient removal of dissolved hydrogen and non-metallic inclusions from molten aluminum.
Using a controlled rotary impeller and inert gas injection process, the system disperses fine gas bubbles throughout the aluminum melt. Hydrogen and impurities are captured by the bubbles and separated from the molten metal, helping improve melt cleanliness, casting quality, and production stability.
Key Benefits
A molten aluminum degassing system is aluminum melt treatment equipment used to remove dissolved hydrogen and help separate non-metallic inclusions from molten aluminum before casting.
Hydrogen has relatively high solubility in liquid aluminum but much lower solubility in solid aluminum. During solidification, excess hydrogen can form gas pores inside aluminum castings.
Rotary degassing introduces an inert gas, typically nitrogen or argon, into the molten aluminum through a rotating graphite or ceramic rotor. The rotor breaks the gas into fine bubbles and distributes them throughout the melt.
Inert Gas → Fine Bubbles → Hydrogen Diffusion → Bubble Separation → Cleaner Aluminum Melt
The result is a cleaner and more stable aluminum melt before filtration and casting.
Hydrogen and oxide inclusions are two common causes of aluminum casting defects.
Therefore, effective aluminum melt degassing is an important step in producing high-quality aluminum products.
Molten aluminum is transferred from the melting or holding furnace to the treatment station.
The graphite or ceramic rotor is lowered to the specified treatment position.
Nitrogen or argon is introduced through the hollow rotor shaft.
The rotating impeller breaks the inert gas into fine bubbles and distributes them throughout the aluminum melt.
Dissolved hydrogen diffuses from the molten aluminum into the gas bubbles.
Oxide films and other non-metallic inclusions can attach to bubbles and rise toward the surface.
After treatment, the degassed aluminum melt proceeds to filtration, casting, or the next processing stage.
A typical system can include:
| Component | Function |
|---|---|
| Degassing Tank | Holds molten aluminum during treatment |
| Rotary Rotor | Disperses inert gas into the melt |
| Graphite/Ceramic Impeller | Generates fine gas bubbles |
| Drive Motor | Provides controlled rotor rotation |
| Gas Supply System | Supplies nitrogen or argon |
| Gas Flow Control | Controls treatment gas flow |
| Heating System | Maintains required melt temperature |
| Control Cabinet | Controls system operation |
| Temperature Monitoring | Monitors molten aluminum temperature |
| PLC/HMI | Enables automated operation and parameter control |
| Exhaust System | Removes treatment fumes and gases |
The rotary impeller creates fine and uniformly distributed gas bubbles, increasing the gas-liquid contact area for effective hydrogen removal.
Controlled rotor speed, gas flow, treatment time, and temperature help achieve repeatable treatment results.
Effective degassing helps reduce hydrogen-related porosity and contributes to improved casting integrity.
The equipment can be configured according to:
PLC/HMI control can be integrated for automatic control of:
| Parameter | Specification |
|---|---|
| Equipment Type | Rotary Degassing System |
| Application | Molten Aluminum Melt Treatment |
| Treatment Method | Rotary Inert Gas Degassing |
| Treatment Gas | Nitrogen / Argon |
| Rotor Material | Graphite / Ceramic |
| Rotor Speed | Adjustable |
| Gas Flow Rate | Adjustable |
| Treatment Time | Adjustable according to melt condition |
| Melt Temperature | Customized according to alloy |
| Control System | PLC / HMI |
| Operation Mode | Manual / Automatic |
| Installation | In-line / Stationary / Customized |
| Furnace Capacity | Customized |
| Power Supply | Customized |
| Exhaust System | Optional |
| Filtration Integration | Available |
Our aluminum melt treatment systems can be used in various aluminum processing applications, including:
For reducing hydrogen porosity and improving internal casting quality.
For aluminum billet and extrusion billet production requiring stable melt quality.
For improving melt cleanliness before sand casting, gravity casting, or other casting processes.
For producing cleaner billet with improved consistency for downstream extrusion.
For aluminum sheet, plate, and rolling applications where melt cleanliness is critical.
Suitable for various aluminum alloy melt treatment processes.
Melting
↓
Molten Aluminum Transfer
↓
Rotary Degassing
↓
Flux / Melt Treatment
↓
Ceramic Filtration
↓
Casting
↓
Billet / Slab / Aluminum Products
Degassing and filtration perform different but complementary functions during aluminum melt treatment.
Degassing primarily focuses on removing dissolved hydrogen and helping float out fine inclusions.
Ceramic filtration physically removes remaining solid non-metallic inclusions from the molten aluminum.
Therefore, a complete aluminum melt treatment line may combine:
This combination can provide a more comprehensive approach to aluminum melt purification.
Every aluminum plant has different production conditions. Longzhyi can design and manufacture a degassing system based on your existing production line.
Send us your:
Furnace capacity + melt flow rate + aluminum alloy + melt temperature + production process
and our engineers can recommend a suitable configuration.
Longzhyi focuses on aluminum melt treatment equipment and provides engineering solutions for aluminum producers and foundries.
We design equipment according to the customer's actual aluminum production process rather than offering only standard equipment.
Equipment dimensions, rotor configuration, gas system, heating system, and control system can be customized.
Our solutions can be integrated with:
From equipment selection and process design to manufacturing, installation, commissioning, and after-sales support.
Before delivery, the system can be inspected and tested according to the agreed technical requirements.
A1:It is primarily used to remove dissolved hydrogen from molten aluminum and can also assist in the removal of certain non-metallic inclusions.
A2:Nitrogen and argon are commonly used as inert treatment gases. The selection depends on the alloy, process requirements, and plant conditions.
A3:Rotary degassing uses a rotating rotor to disperse inert gas into the molten aluminum as fine bubbles, increasing gas-metal contact and improving hydrogen removal.
A4:Degassing can help float certain inclusions to the melt surface, but it should not be considered a replacement for ceramic filtration. For high cleanliness requirements, degassing and filtration are often used together.
A5:Yes. The system can be customized according to furnace capacity, melt volume, alloy, treatment method, production rate, and existing plant layout.
A6:Yes. The rotary degassing system can be designed as part of a complete aluminum melt treatment line, including ceramic filtration and casting equipment.
Improve aluminum melt cleanliness and reduce hydrogen-related casting defects with a properly designed rotary degassing system.
Tell us about your aluminum melt treatment requirements.
Please provide:
Longzhyi provides customized molten aluminum degassing systems for aluminum foundries, billet producers, extrusion plants, rolling mills, and aluminum casting facilities.
Our rotary degassing equipment is designed to improve molten aluminum cleanliness through controlled inert gas treatment. By optimizing rotor speed, gas flow, treatment time, and melt conditions, the system helps remove dissolved hydrogen and improve the consistency of aluminum melt quality.
For aluminum plants with higher cleanliness requirements, the degassing system can be integrated with ceramic foam filtration and other melt treatment equipment to create a complete aluminum melt purification solution.
Contact Longzhyi for a customized molten aluminum degassing system based on your production requirements.
