STUDY ON DESULPHURIZATION IN STEELMAKING PROCESS

Abstract

The author studied on the mechanism of desulphurization by investigation of the data in the basic furnace steelmaking process. The results obtained were as follows:
1) When the iron-oxide concentration in the slag was low ((FeO) less than about 6-7%), as that in the slag of the reducing stage in the electric furnace, the controlling reaction for desulphurization was then;
But in the high iron-oxide concentration slag ((FeO) more than about 10%), as the basic open hearth furnace slag in the steelmaking process, the controlling reaction for desulphurization was then;
2) In the low iron-oxide concentration slag the desulphurization ratio increased with the increase of carbon concentration in the molten steel, as the carbon increased the activity of sulphurin the molten steel.
3) In the high iron-oxide concentration slag, the controlling factor for desulphurization was the sulphur diffused from the molten steel to the slag, and it was interface reaction.
So the desulphurization ratio increased by heavily boilling the molten steel with decarburization reaction. The author described the measuring method of the pH in extraction liquid of slag and its application with the desulphurization.