In the converter steelmaking, the normal feeding sequence is: scrap-molten iron, that is, first add a certain amount of scrap to the converter, and then start adding molten iron.
Read More
Adding
scrap steel first is more from a safety perspective. First, the residual
temperature in the furnace can be used to bake the scrap, evaporate the water
vapor in the scrap, and reduce the hydrogen content in the molten steel from
the source; the second is the scrap at the bottom of the furnace. The formation
of a buffer zone is beneficial to reduce the impact of multiple additions of
molten iron on the furnace bottom lining.
If
the molten iron is added first and then the scrap steel is added, once the
scrap steel is wet or mixed with water, because the density of the scrap steel
is relatively high, it will sink after being added to the molten iron. Because
the temperature of the molten iron is relatively high, the water is instantly
vaporized to form steam, and the volume of the molten iron is rapid in a short
time. Expansion will cause an explosion accident. This situation is quite
dangerous. If the scrap is mixed with bombs, sealed containers, etc., the harm
will be even greater. There is also a method of adding molten iron before
adding scrap: mainly from the perspective of furnace protection. Ironing first
can effectively reduce the impact of large scrap steel on the front lining of
the converter, increase the life of the furnace lining, and reduce the use of
scrap when smelting ultra-low carbon steel. The phenomenon occurs. The general
principle is to protect the furnace from being damaged by scrap steel. When the
scrap is heavier, the amount of bottom slag is not large, and the molten iron
is added several times, the molten iron must be added first.
The
two loading sequences need to be determined according to the actual site, and
can be flexibly changed.
No comments:
Post a Comment