Refratechnik Casting - Calcium aluminates
print view - Calcium aluminates
18.05.2012 - 09:40 clock
The production of high quality steel grades requires the
application of selected materials. Modern process management
of steel plants minimises vessel slag carry over. A secondary
metallurgical treatment of steel demands a synthetic slag to be
applied. Amongst others, calcium aluminates is used for this
application, such asREFRAFLUX® S.
application of selected materials. Modern process management
of steel plants minimises vessel slag carry over. A secondary
metallurgical treatment of steel demands a synthetic slag to be
applied. Amongst others, calcium aluminates is used for this
application, such asREFRAFLUX® S.
Production
Amongst others, the raw materials for the production of REFRAFLUX® S are coarse bauxite, limestone or dolomite respectively.
REFRAFLUX® S is granulated and sintered in a revolving cylindrical furnace. Therefore, REFRAFLUX® S is both, dust-free and almost free from carbon, crystal water and adherent moisture.
Amongst others, the raw materials for the production of REFRAFLUX® S are coarse bauxite, limestone or dolomite respectively.
REFRAFLUX® S is granulated and sintered in a revolving cylindrical furnace. Therefore, REFRAFLUX® S is both, dust-free and almost free from carbon, crystal water and adherent moisture.
By combining granulation and subsequent sintering it is possible to produce calcium aluminates of most different composition and to produce them according to the individual customer specifications.
10 % < CaO < 53 %
25 % < Al2O3 < 60 %
1 % < MgO < 20 %
Secondary phases:
SiO2, Fe2O3, TiO2 et. al.
10 % < CaO < 53 %
25 % < Al2O3 < 60 %
1 % < MgO < 20 %
Secondary phases:
SiO2, Fe2O3, TiO2 et. al.
Properties
Depending on the intended field of application, REFRAFLUX® S is produced in different fraction sizes. As a flux for the continuous casting tundish we offer a granulation of 0.5-5.0 mm. In the field of secondary metallurgy a granulation of 5-15 mm is applied.
REFRAFLUX® S is a microporous granulate. If the melt or slag is moved, for instance by purging, liquid slag or melt respectively penetrates into the pores and REFRAFLUX® S is quickly dissolved.
Depending on the intended field of application, REFRAFLUX® S is produced in different fraction sizes. As a flux for the continuous casting tundish we offer a granulation of 0.5-5.0 mm. In the field of secondary metallurgy a granulation of 5-15 mm is applied.
REFRAFLUX® S is a microporous granulate. If the melt or slag is moved, for instance by purging, liquid slag or melt respectively penetrates into the pores and REFRAFLUX® S is quickly dissolved.
Application
Their main field of application is in the secondary metallurgy. Calcium aluminates are particularly used for desulphurisation in the ladle furnace. A highly reactive slag is built up very quickly. This slag can easily be saturated by CaO on adding lime for optimal desulphurisation.
Another field of application of pre-reacted calcium aluminates is the production of hydrogen-sensitive steel qualities, such as heavy plate grades.
Their main field of application is in the secondary metallurgy. Calcium aluminates are particularly used for desulphurisation in the ladle furnace. A highly reactive slag is built up very quickly. This slag can easily be saturated by CaO on adding lime for optimal desulphurisation.
Another field of application of pre-reacted calcium aluminates is the production of hydrogen-sensitive steel qualities, such as heavy plate grades.
In continuous casting plants REFRAFLUX® S is applied as a flux in the tundish as so-called "sandwich layer". Having a liquid top slag, the contact of steel with the ambient air is avoided, and possible reactions between the steel and acid covering materials, such as NERMAT® AF, are
reduced, and rising non-metallic inclusions are bound.
reduced, and rising non-metallic inclusions are bound.
Desulphurisation with REFRAFLUX® 4842 S
Results of 1081 heats
Results of 1081 heats
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