RATE OF REDUCTION OF MnO IN SLAGS BY LIQUID IRON CONTAINING CARBON.

Abstract

Rate of reduction of MnO in slag by liquid iron was studied mainly at 1600 degree C. Experiments were carried out with liquid iron containing carbon from 0. 8% to saturation and CaO-SiO//2-Al//2O//3 slag containing about 5%MnO. Evolution of CO gas was observed with an X-ray technique. Reduction of MnO in slag took place by exchange reaction with iron and reaction with carbon in iron. The reduction rate of MnO at the initial reaction stage was little affected by the carbon content and the slag basicity, but the final Mn concentrations of melted irons were higher in high carbon containing iron and with the use of more basic slag. CO bubble evolution was proportional to the carbon content of the iron, and the evolution stopped within a shorter time period when highly basic slag was used.