Abstract
Experiments were done on the rate of decarburization of molten iron with CO2-Ar mixtures. The rate of reaction at the whole surface of melt varied almost proportionally to the flow rate of gas, but deviated remarkably from the linear relation at high flow rates. If the blowing tube approached to melt, the rate of reaction increased. When the interface area was changed with magnesia ring of i.d. 2r, the rate of reaction was proportional to r3 but not to r2. When the velocity of gas stream was high, it was clarified that the outer parts of metal surface attributed hardly to decarburization. A linear relation was found between the flow rate of gas and the rate of decarburization per unit area of melt at the front of the blowing tube. As the results, it seems probable that the difference of attribution in different localties to the proceeding of reaction is caused by the difference of velocity of gas stream at different localties at the interface. Variations of the rate of decarburization were also tried to be explained by means of the gas boudary layer theory.
