UNIVETERNITY MACHINERY COMPANY LIMITED

During aluminum and aluminum alloy smelting process, the hydrogen produced by chemical action
with steam diffuse in molten aluminum, which will cause inner structural defect to aluminum products.
In order to avoid such defect, most aluminum factories apply dissolved gas floating method to purify
molten aluminum. i.e. inert gases such as nitrogen, argon is injected into molten aluminum, and hydrogen
will be brought to molten aluminum surface with spread and rise of inert gas. Graphite rotor is necessary
part to inject inert gas and stir for degassing by intermittent or continuous online degassing methods.

Characteristics:

Physicochemical:

Graphite rotor operating skills:

- Preheat before use :  

Graphite rotor shall warm-up at about 100mm above the surface of the molten aluminum for 5min ~ 10min before
immersion in to avoid affecting the quenching of the material ; Gas shall be inject before graphite rotor immersion
in and after rotor left the molten aluminum to prevent the rotor nozzle clogging.

- Isolate air :  

To ensure positive pressure at tank compartment when inject gas into to isolate outside air to prevent oxidation of
the graphite rotor.

-Rotor immersion depth :  

Graphite rotor shall immerse in molten aluminum at reasonable depth. The exposed surface of aluminum reinforced
sleeve around 80mm, and immerse below molten aluminum surface about 60mm, so that the rotor can effectively
increase it antioxidant resistance and extend erosion wear timing.

-Smooth transmission:  

Graphite rotor and drive system is connected via a connecting rod ( tube ). The long connecting rod deformation occurs
at high temperature, or relevant parts loosening. All these will affect rotor smooth running and centering, and easily
cause rotor break or bump.

-Argon or nitrogen purity:  

If any impurity argon or nitrogen gas injection for leakage of piping for fittings, it may cause serious oxidation to rotor upper
position, or even the number of the lower rotor fumaroles that will greatly reduce the life of the rotor.