Graphite rotor, shaft for degassing molten aluminium, SNIF, ALPUR, STAS

Long-life graphite rotor, impeller and shaft for degassing in molten aluminium. Specialised in SNIF Pyrotek degasser, STAS degasser, Novelis ALPUR degasser  and Hertwich degasser.

The rotor is composed of a high purity shaft with quick or threaded coupling and by the rotor impeller. The rotor geometry is designed for adapting to degassing devices used in furnaces and ladles. The rotor can be used in a wide temperature range: from 650 to 1500° C. The new impregnated coating has excellent non-wetting properties and a very long service life of 3-4 months in molten aluminium.

The high precision rotor shaft impeller is designed to inject and evenly disperse an ascending flow of tiny bubbles of the process gas (inert gas, with a possible addition of chlorine to reduce alkali).

8 in stock (can be backordered)

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New long-life impregnated graphite rotor impeller & shaft to be used for degassing in molten auminium for SNIF, ALPUR and STAS

Graphite rotors, impellers and shafts are widely used for dispersing hydrogen of inline degassing aluminum. We are specialised in all in-line degassers such as STAS, Novelis ALPUR, Pyrotek SNIF and Hertwich.

During aluminum and aluminum alloy smelting, 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 . 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.

A twirling graphite rotor shatters nitrogen (or argon), which is blown into melting inline degassing aluminum, into profuse bubbles that disperse in the liquid metal. Regarding gas pressure difference and surface adsorption principle, bubbles in the melt absorb hydrogen and oxidation slag inclusion which are taken out to surface of the melt with the rise of the bubbles, so that the melt can be purified.

Nowadays, as an alternative to graphite rotors, impellers and shafts, ultrasonic degassing in molten aluminium has now become the standard. A 20 kHz ultrasonic generator creates cavitation which disperses the hydrogen in the aluminium bath. This technology is also used for ultrasonic grain refinement and ultrasonic micro-alloying in molten non-ferrous melts.

1. Our graphite rotor is made of high-quality graphite material.
2. We apply a special anti-oxidant treatment, with a service life could reach 5 -10 times higher compared to non-treated graphite rotor/impeller/shaft
3. Our graphite rotor is widely used in high purity aluminum industry and aluminum alloy casting industry.

Our unique anti-oxidant graphite rotor, impeller & shaft has an outstanding oxidation resistance, corrosion resistance, high hardness, high compressive strength which makes continuous use for 90-120 days possible, thus effectively reduce producing cost for customers.

Our graphite is both ISO 14001 and ISO 9001 certified

Graphite datasheet

GRF-NVD-3-IMP

Bulk density g/cm³

⩾ 1,78

Electrical Resistance μΩ*m

⩽ 9

Compressive strength MPa

⩾ 35

Flexural strength MPa

⩾ 16

C.T.E. 10-6°C

⩽ 2,5

Elastic Modulus GPa

⩽ 14

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