Effect of sulfur content on graphite precipitation behavior during cooling process of hot metal
The kish graphite precipitated from hot metal is a sustainable resource.This method of recovering kish graphite from hot metal has broad application prospects due to the huge production of pig iron.This paper investigates the effects of sulfur content in hot metal on the precipitation behavior of kish graphite.Molten iron with varying sulfur contents was cooled and characterized using scanning electron microscope(SEM),X-ray diffraction(XRD),Raman spectroscopy(Raman),and other methods.The results show that an increase in sulfur content leads to the formation of a significant amount of MnS through the combination of manganese and sulfur in hot metal.Kish graphite precipitated from hot metal tends to grow on the heterogeneous nuclei of MnS.This causes a change in the shape of kish graphite from flake to fragment,a gradual decrease in crystallinity,and an increase in surface defects.Therefore,kish graphite with a high degree of crystal degree can be precipitated from hot metal with low sulfur content by cooling.Based on this,a new process for producing kish graphite in ironmaking is proposed,providing a theoretical reference for the industrialization of kish graphite precipitated from hot metal.
hot metalkish graphite precipitationsulfur contentresource recovery
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