Abstract
To clarify the sprash formation behavior by top blown oxygen gas under hot metal decarburization, the experiments by small scale induction furnace and water model were carried out and the following points were found.
1) Between sprash height and cavity depth, when the oxygen gas was blown to hot metal, clear relationship was not found but when the Ar gas was blown to hot metal or the oxygen gas was blown to low carbon content molten steel, good relation was found.
2) When Ar gas was blown to hot metal, carbon content of the sprash particles were simillar to that of hot metal bath and the size were large. On the contrary, when oxygen gas was blown to hot metal, very low carbon containning, small size sprash particles were collected.
3) For oxygen gas blowing condition, good relationship was found between sprash height and waste gas flow rate calculated by the degree of decarburization.
According to the above mentioned results and energy balance calculation, it can be considered that the energy generated by gas formation when decarburization reaction took place was the primary affecting factor for sprash formation rather than the kinetic energy of the top blown gas.
