Graphite Injection Tubes

Description

For the cleaning of molten metal, gases or powder are introduced into the melts in controlled quantities. Graphite COVA supplies tubes, porous heads and nozzles for this application.

Graphite COVA products used for

• Degassing and flushing of molten Aluminium with Argon, Nitrogen, Chlorine or mixture of these gases.
• Cleaning and de-oxidation of molten metal by means of Nitrogen with precise quantities of Phosphorus.
• Desulphurisation of molten cast iron and production of spheroidal cast iron by means of Magnesium powder

Their special degassing tubes with special chemical and physical properties along with excellent resistance
against thermal shocks are suitable for this application.
The chemical resistance and low wetting of our graphite by molten metal is an added advantage.

The graphite tubes are non-meltable and do not react with molten metal and does not contain impurities that
can be dissolved in non-ferrous metal melts.

Attention has to be paid to the oxidation of graphite in air at temperatures above 500 deg. cen.
This temperature dependant oxidation leads to graphite wear and affects the lifetime.

Graphite COVA has developed a Special anti-oxidation impregnation called OH26 – 1.
This impregnation fills the pores and surface of the graphite which hinders the Oxygen attack.
The average life time is considerably extended by this special impregnation.
 

Gas injection systems:
Graphite COVA can supply injection systems as per customer-specific design. The rigid system will have simple
tubes having threads at the ends.

Distributors can be

• Porous head
• Closed tubes with side vents
• Distributer heads and distributer crosses