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Address:
Glafo, PG Vejdes väg 15,
SE-351 96
Växjö
SWEDEN
Visitor's address:
Vejdes plats 3
Tel: +46 10 516 63 50
E-mail: info@glafo.se
You find
a map at the
"about Glafo" page.
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CORROSION
OF ROCK WOOL MELTS - REFRACTORY MATERIALS (PR 372) - finished 1999
The corrosion properties of refractory materials can be investigated
by either static or dynamic trials. A static test is much simpler
to perform but a dynamic test is more simliar to realistic conditions.
The dynamic test is also more time efficient.
A new refractory
material is being tested. The photos show a brick in halves where
the molten glass has poured down in the cavity. At the left,
before the experiment, at the right after being exposed to a
contiuous glass flow for a long period of time in a so called
dynamic test.
Finger test method
and SEM line analysis
Different kinds of static tests have been done at Glafo during
many years. We also have complete equipment for the established
finger test method and this method has been used in both research
programs and for individual projects. The finger test method
means rotating of a rod of refractory material in a glass melt
for a fixed time. The result is presented as the decrease of
the volume of the rod. A complement can be a line analysis by
SEM of the interface between glass and refractory.
Rock wool melts
Melts for production of rock wool are most often extremely corrosive
to refractory material. Therfore, it is important to use refractory
material in the melting unit with optimal resistance to the actual
melt. A glass wool melt is much less corrosive and in the production
of glass wool standard refractories for glass tanks are used.
For these materials the finger test method is used for determination
of corrosion properties. To apply the finger test method to a
rock wool melt is more difficult, so tests of refractories for
rock wool melts have to be done by a static method.
New improved test method
A dynamic method is developed in order to simulate a floating
melt over the refractory material at maximim 1500 °C. The
result is presented in pictures and by loss of volume of the
test sample. The total time to a representive result of the corrosion
property of a refractory material is reduced to 4-6 days. Rock
wool melts are most often very corrosive to hith temperature
resistant materials.
CURRENT PROJECTS
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