Degasser Graphite Rotor for Aluminum Liquid

Degasser Graphite Rotor For Aluminum Liquid Product Introduction:

 

Degasser Graphite rotor for Aluminum liquid is used for purification, slag removal, degassing, material blowing, etc. in casting industries such as aluminum, alloy, and zinc. Special treatment greatly improves the service life. Shorten smelting time and reduce production costs. The degassing rate is above 50%, and it is suitable for purifying aluminum liquid in crucible furnaces, pouring ladles, gas outlet boxes, and static boxes. The graphite rotor works continuously in an aluminum melt at about 750°C at a rotation speed of 200r/min~400r/min. Our company produces graphite rotor mining.
Made of high-purity graphite, the quality of the graphite itself has a significant impact on the service life of the rotor. At the same time, an anti-oxidation protective coating is applied to the surface, which can extend the service life to 50-60 days.

Degasser Graphite Rotor For Aluminum Liquid Working Principle

 

The Degasser Graphite rotor for Aluminum liquid consists of two parts: the rotor rod and the nozzle.
The transmission system drives the graphite rotor to rotate, and argon or nitrogen passes through
The rotor rod and nozzle blow into the aluminum melt. The high-speed rotating graphite rotor breaks up the argon or nitrogen gas that enters the aluminum melt to form many small bubbles, which are dispersed in the molten metal. At the same time, the rotating rotor also promotes the diffusion of hydrogen and inclusions in the aluminum melt, causing them to interact with the aluminum melt. Bubble contact, the bubbles in the melt rely on the gas partial pressure difference and the principle of surface adsorption to absorb hydrogen in the melt, adsorb oxidized slag, andAs the bubbles rise, they are brought out of the melt surface, allowing the melt to be purified.

1. The Degasser Graphite rotor for Aluminum liquid rotating nozzle is made of high-purity graphite. In addition to breaking up the bubbles, the structure of the nozzle also uses the centrifugal force generated by stirring the aluminum alloy melt to make the melt enter the nozzle and mix evenly with the horizontally ejected gas. Form a gas/liquid flow to eject, increase the contact area and contact time between bubbles and aluminum alloy liquid, and improve the degassing and purification effect.

2. The rotation speed of the Degasser Graphite rotor for Aluminum liquid can be continuously adjusted through the frequency converter speed control, up to 700 r/min. Graphite rotor specifications are Φ70mm～250 mm, the impeller specifications are Φ85mm~350mm, and the high-purity anti-oxidation graphite rotor has the characteristics of high strength, high temperature resistance, and aluminum flow corrosion resistance. During the purification and degassing process, the surface of the aluminum alloy liquid in the box is covered with nitrogen for protection, so that the part of the graphite rotor exposed to the aluminum alloy liquid is in inert gas, preventing high-temperature oxidation of the rotor and extending the service life of the rotor.

3. The shape of the impeller is streamlined, which can reduce the resistance during rotation, and the friction and scouring force generated between the impeller and the aluminum alloy liquid is also relatively small. As a result, the degassing rate is above 50%, the smelting time is shortened, and the production cost is reduced.

4. The surface has undergone special anti-oxidation treatment and has a long service life.

It is about 5 times that of ordinary products and is widely used in the aluminum alloy casting industry.

5. The service life is up to 2 months in aluminum plate, aluminum foil casting, aluminum alloy wheel hub and other aluminum processing industries.

First, the customer provides the original design drawings and a completed graphite rotor usage environment survey form. Then, based on the drawings, a technical analysis is conducted based on the graphite rotor speed, rotation direction and its relative position to the aluminum liquid level, and a suitable erosion and oxidation resistance is proposed. deal with.

Operating requirements for graphite rotors

1. Preheat before use: Before the graphite rotor is immersed in the aluminum liquid, preheat it for 5 to 10 minutes at about 100mm above the liquid level to avoid the impact of rapid cooling on the material; gas must be introduced before the rotor is immersed in the liquid; the rotor must be lifted out of the liquid surface Only then can the air supply be stopped to prevent the air holes of the rotor nozzle from being clogged.

2. Isolate air: Pour nitrogen or argon into the purification chamber to ensure positive pressure inside the chamber and isolate external air to prevent oxidation of the graphite rotor.

3. Rotor immersion depth: The graphite rotor should be immersed in the aluminum melt at a reasonable depth so that the reinforced sleeve is exposed to about 80mm above the aluminum liquid level and about 60mm below the liquid level. This can effectively increase the rotor's resistance to oxidation loss and erosion.

4. The transmission system is stable: the graphite rotor and the transmission system are connected through connecting rods (tubes). The connecting rods are deformed under high temperature for a long time, or the relevant parts of the transmission equipment are loose, which will affect the centering and operation of the rotor. The stability of the graphite rotor can easily cause the graphite rotor to break or knock

Damage caused by collision. The argon or nitrogen gas must be pure: if the argon or nitrogen gas introduced into the aluminum melt is impure due to leaks in pipes, joints and other components, the upper part of the rotor will be severely oxidized, and even several rotor nozzle holes in the lower part will also be oxidized. , which will greatly shorten the service life of the rotor.

Advantages Of Graphite Rotors

 

For aluminum alloy foundries and aluminum product factories, a very important point is to reduce processing costs. In this regard, the graphite rotors produced by our company can bring the following benefits.
1. Reduce processing costs
2. Reduce the consumption of inert gases
3. Reduce the aluminum content in the slag
4. Reduce labor costs
5. Improved performance, longer replacement cycle 6. Improved reliability, reduced maintenance costs.

High-temperature oxidation: The main component of graphite is carbon. Graphite undergoes visible oxidation under air conditions exceeding 600°C. The products of the carbon oxidation reaction are CO and CO2 gases, which cannot protect the rotor; generally speaking, the degassing box It cannot be completely sealed, and most of the inner cavities of the box do not have.

When filled with protective gas, the oxidation of the graphite rotor is inevitable. As a result of the oxidation, the diameter of the rotor shaft gradually becomes smaller until it breaks and is scrapped.

Aluminum liquid erosion: The graphite rotor is immersed in the aluminum liquid in the degassing box. It usually rotates at a speed of 200r/min~400r/min and strongly agitates the aluminum liquid. The aluminum liquid will cause strong erosion and friction on the rotor. Especially the contact area between the liquid level and the rotor rod gradually becomes thinner and will eventually break and be scrapped.

Impact of the transmission system: The transmission system of the degassing device is unstable, especially the connection with the rotor is not concentric. The rotor swings during operation. On the one hand, the friction between the rotor and the sealing plug causes damage; on the other hand, the tumbling of the liquid level increases, The oxidation and erosion of the rotor intensifies, accelerating the loss of the rotor.

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