Liquidus Temperature of splashing slag: 

The liquidus   temperature of slag is important because

i)   Slag layer should contain enough high temperature phases to prevent attack by         slagduring BOF process.     

ii)   Low melting phase melts and thereby coating thickness decreases

iii)   Too high liquidus temperature will lead to non uniform distribution of slag and there is        tendency for the slag to build up at the bottom.

Problems with slag splashing

    A.   Lance skulling

This is particularly severe if some metal is left in the vessel

    B.   Vessel mouth skulling.

    C.    Blockage of tuyeres

    D.    Sensors are embedded in the refractories to detect the presence of slag during tapping. The slag             coating interferes with the detection.

Benefits of slag splashing

• Longer life of furnace lining (over 60000 heats).
• More recycling of BOF slags.
• Less CaO is needed in BOF process due to dissolution of basic slag coating.
• Decrease in sloping results in increase in yield.
• Rapid formation of slag occurs due to melting of low temperature phase of the coating.