Slag splashing is general practice to increase lining life of BOF converters. Some slag is left in converter after tapping for doing slag splashing. Dolomite is added sometimes before splashing. After doing slag splashing the FeO content of the slag is increasing compared to end of blow slag . What might be the reason for this phenomena.
In general, isnt so common increase FeO contents after Slagplashing.
It observed that in fact drops due one main reason: increase MgO and CaO contents due dolomite.
Listed below some possibilities to increase FeO after splashing:
a) FeO contents into dolomite
b) bad control valves during change Oxygen to Nitrogen
c) Some small amount of no melt scrap
d) Late additions of iron oxides coolants and melting due slag mixing
Regards
Breno Totti Maia good tips...some of them didn´t come up to my mind.
I am thinking about residual liquid steel after tapping, or sampling...so maybe it is not increasing really.
In the upcomeing months we are going to do some testings about slagsplashing and slag composition...maybe we can share some info about it.
Jaromír Till ,to complete your comment, sometimes a so fluid slag after blow, washs converter walls with this residual steel after tapping.
