Mechanism of Dust Formation during Decarburization of High Carbon Iron Melt by Oxygen Blowing

Abstract

Characteristics of dust formation during decarburization of iron melt containing carbon(0.704.86%) and manganese (0.211.48%) were studied using a 50kg induction furnace.
Platinum, having lower vapor pressure even at high temperature, was added in the melt as a tracer to make clear the origin of dusts.
The results obtained are summarized as follows;
(1) Though the major dust particles, collected from exhaust gas during decarburization of iron melts containing carbon and manganese by the top-blown oxygen, are smaller than 4μm, they are formed by the combination of fume dust with bublle bursting dust.
(2) The ratio of bubble bursting dust collected from exhaust gas is higher at higher carbon concentration of melt.
(3) Concentration of manganese in fume dust depends on the evaporation rate controlled by the processes of both mass transfer in melt and evaporation from free surface.