

In the aluminum melting and processing industry, product quality and production efficiency are always the core concerns of enterprises. With the increasing demand for high-quality aluminum, the purity of liquid aluminum becomes particularly important. Gases and impurities in liquid aluminum can affect product performance, resulting in production defects and waste.
As one of the most effective molten aluminum degassing technologies, the box degassing device efficiently removes gases and inclusions from liquid aluminum, making it the preferred solution for high-end aluminum castings.
In a box type degassing device, the rotor rotates at high speed in the box to disperse the inert gas to form a large number of small dispersed bubbles. These small bubbles enter the aluminum liquid, and carry away the hydrogen and oxidation slag in the aluminum liquid with the floating, to achieve the purpose of degassing and refining. During the rise of the bubble, the inclusions will be brought out of the surface of the liquid aluminum by surface tension to form scum, so as to effectively remove impurities. At the same time, the stirring of the rotor makes the alloy composition in the aluminum liquid more uniform, and further improves the quality of the aluminum liquid. Through this process, the box degassing unit significantly improves the purity and performance of the aluminum.
The dispersion of process gas in liquid aluminum is excellent, ensuring full contact between bubbles and liquid aluminum.
The box is completely sealed to provide a stable inert gas environment and eliminate external influences.
The liquid aluminum surface remains smooth to avoid turbulence and improve casting quality.
The installation and maintenance is easy. The lining of the pre-fired degassing box can be changed quickly to reduce downtime.
The overall maintenance and operation costs are low, and the rotor and shaft have a long life to ensure the long-term stability of the equipment.
The heater and its protective tube have a long service life, and the cooling gas does not require the rotor rotating spindle, reducing energy consumption.
| Model | HMBDU-5 | HMBDU-15 | HMBDU-30 | HMBDU-50 | HMBDU-70 |
|---|---|---|---|---|---|
| Number of rotors | 1 | 1 | 2 | 2 | 3 |
| Maximum flow (T/H) | 7 | 15 | 30 | 50 | 70 |
| Maximum gas consumption (L/min) | 70 | 90 | 140 | 160 | 180 |
| Number of heaters | 1 | 1 | 2 | 2 | 3 |
| Driven form | Centralized drive | ||||
A box degassing device is a molten aluminum refining system. It uses a high-speed rotating rotor to disperse inert gas into fine bubbles. As these bubbles rise through the liquid aluminum, they capture hydrogen and bring oxidation slag to the surface as scum, effectively purifying the melt.
By removing gases (mainly hydrogen) and non-metallic inclusions, the device eliminates internal defects, porosity, and waste in final castings. It also stirs the melt to ensure uniform alloy composition.
The unit is designed for easy maintenance. It features a pre-fired degassing box lining that can be changed quickly to minimize downtime, alongside a long-life rotor and shaft that lower overall operating costs.
No. The design ensures the liquid aluminum surface remains smooth. This avoids turbulence, which prevents re-oxidation and gas re-absorption during processing.
Selection depends on your required flow rate and capacity. Models range from HMBDU-5 (7 T/H flow rate, 1 rotor) up to HMBDU-70 (70 T/H flow rate, 3 rotors) to match different industrial scale demands.