Study of phosphorus removal from steel in oxygen converter

The process of dephosphorization was studied using radionuclide 32P obtained by the irradiation of ferrophosphorus in a nuclear reactor. The labelling material was dissolved in pig iron prior to casting in the converter. In the process of melting steel, slag and stack flue ash, were sampled, in the process of homogenization and steel casting, samples of slag and steel were taken. The results of trial castings confirmed the high level of dephosphorization of steel in the converter especially in the initial stage of the casting, and the passage of the phosphorus in combustion wastes into stack sludges and water in the gas treatment unit. The weight of the slag was determined which passes from the converter to the ladle during tapping, and its effect on increasing the P content in steel. It was proved that 80 - 95% of the phosphorus from the slag returned to the steel by back reduction. (author). 4 figs., 4 tabs., 3 refs