Potential post combustion issues

• Repair costs  of post combustion lance are higher
• Post combustion lances are not rigid as standard oxygen lances.
• Optimization of angle, location, number and diameter of ports for supply of oxygen needs to be established keeping in mind the refractory wear.
• Development of high quality refractory would be required because high temperature would be generated in the post combustion zone.

Slag splashing

Splashing of slag to coat the refractory lining has become a standard practice to increase the lining life. Slag splashing is done as follows:

• At the end of BOS process, steel is drained of and slag is retained in the vessel.
• The   lance is lowered and high pressure  is used to splash molten slag on the walls of BOS vessels for a period of 2 to 4 min. 
• Slag refractory provides a consumable refractory lining which protects the furnace lining.
• The excess slag is poured out.