Before iron is charged into the steelmaking vessel, its
surface is covered by slag arising from either the blast
furnace or from a previous desulphurising treatment.
Since these slags, particularly from the desulphurising
treatment, are of a high sulphur content, it is important
to
remove as much slag as possible to prevent sulphur reversion
in the steelmaking vessel. In extreme cases 1% slag carry-over
of blast furnace slag can result in sulphur increases
in the steel of up to 0.015%.
The coagulating effect of SLAX 35 is more efficient
when the product is spread on to the iron surface containing
only fluid slag. Accordingly it is recommended that
the hard, solid slag is first removed by raking before
the SLAX 35 is applied.
|
