Hi-Tech Carbon Co.,Limited
Graphite Rotor & mixer &outgassing bar
Property:Supper bending strength & high Compressive strength;Strong oxidation resistance
Material;Impregnation of high purity graphite mold and three special antioxidant treatment
Service Life;About 700 °C: 55-65 days More than 1000 °C: 2535 days (depending on the size
and operation)
Application;Aluminum , zinc alloy, casting industrial purification, slag, gas, blowing material..
Typical dimensions;50 - 150mm 500 - 1200mm Length;Graphite rotor head: Dia:100-300mm
Liquid aluminum erosion: liquid aluminum graphite rotor immersed in addition to gas in the
box,use 200R / min to 400R / min speed and strong agitation of liquid aluminum, aluminum liquid
will produce a strong scour, friction on the rotor. Especially in the surface contact with the rotor bar
position tapering, finally breaking scrap.
Influence of transmission system:degassing device transmission is not smooth, especially
with the rotor connections do not concentric, operation process of the rotor, a sealing plug between
rotor and friction caused by damaged; on the other hand, increasing the level of oxidation, tumbling,
rotor scour intensifies, accelerate the rotor loss.
Operating skills
Preheating : graphite rotor immersed in liquid aluminum front, above the surface about 100mm
preheating 5min ~ 10min, avoid quenching effect on material; must first pass into the liquid gas
rotor; rotor can be proposed in the surface after the cessation of gas supply, to prevent air spray plug.
Isolation of the air: nitrogen or argon enters in the purifying chamber, ensure that the chamber
is pressurized, isolation outside air, to prevent the oxidation of graphite rotor.
The rotor immersed depth: the reasonable depth of rotor immersed in molten aluminum,
the aluminum surface exposed to enhanced set about 80mm, soaked in about 60mm, so can
effectively increase the rotor antioxidant loss and erosion wear time.
Transmission system: graphite rotor and transmission system is through the connecting rod
(pipe) is connected to the connecting rod, the longterm deformation under high temperature, or
transmission equipment related parts loose, will affect the rotor to neutral and running stability,
easy to make the graphite rotor broken or bump damage.
Argon or nitrogen to pure: if the pipeline, connectors and other components of gas leakage
caused by the argon gas or nitrogen gas is not pure aluminum melt, will make the upper part of the
rotor is oxidized seriously, even make some jet hole at the lower part of the rotor is also oxidized,
it will greatly shorten the service life of the rotor.
Appendix: graphite rotor rotating nozzle is made of high purity graphite, the nozzle structure
into account should be scattered outside the bubble, the centrifugal force produced by the agitation
is aluminum alloy melt, melt into the gas nozzle and the level of jet mixing, forming a gas / liquid
flow ejected, increase the contact area and the contact time of gas bubbles and liquid aluminum alloy
in addition, to improve the gas purification effect. 2, graphite rotor speed can be step less regulation
through frequency converter speed control, up to a maximum of 700 R / min.
Graphite rotor economy:
For the aluminum alloy casting factory and aluminum products factory, is a very important point is to
reduce the cost of the treatment, in this respect, graphite rotor our production can bring the following
benefits. 1, reduce the cost of the treatment 2, reduce consumption of inert gas, reduce 3 Al content in
slag 4, reduce labor costs, improve the performance of the 5, the replacement cycle longer 6, improve
reliability, reduce the maintenance cost.
Design and order of graphite rotor:
Because the graphite rotor specifications used each casting or casting production line is not the same.
First of all, by the customers with the original design drawings and graphite rotor complete use of the
environment to investigate single, then, according to the drawings with graphite rotor speed, direction
of rotation and its relative position with the aluminum surface of technical analysis, put forward the
appropriate antioxidant treatment resistant scour.
