Acceleration of Dephosphorization in Oxygen Converter under Agitation by Blowing of Gas.

Studies on preferential dephosphorization-I

Abstract

Using a small test L. D. converter, experiments were carried out on preferential dephosphorization in the period of desiliconization blowing of L. D. converter and especially, the relation between the rate of dephosphorization and the intensity of agitation of molten bath was investigated.
The results obtained are as follows:
1) The rate of dephosphorization is given by the formula, dp/dt=k [p] ⁿ, where n=1 in the period of desiliconization blowing.
2) Dephosphorization is promoted by hard agitation of molten bath. However, when the agitation of molten bath is intensified by blowing oxygen itself, decarburization is promoted simultaneously.
3) By injection of inert gas for agitation into the bath in the period of desiliconization blowing, dephosphorization is promoted extremely without any promotion of decarburization; and under the optimum conditions, a very low content of phosphorus can be obtained at high carbon range.