The world trend of steelmaking forwards to economical steel production with continuously increasing demands on the quality of produced steel. This fact causes increasing production of micro alloyed steel at the expense of production of conventional steel. At the same time outgoing in forefronts ecological aspects related with steelmaking. These serious demands can be possible meet only using of properly functioning slag system in the metallurgical reactors. In all of these reactors, desulphurization depends on temperature, amount of oxygen and sulphur in the metal, but mainly on chemical composition and physical properties of slag. Metallurgical slag parameters must be defined using the complex of physical and chemical characteristics as an oxidation potential, optical basicity, sulphide capacity and sulphur distribution coefficient. A requirement for effective desulphurization is also the minimum amount of easy reducible oxides in the slag. There are many correlations that can describe the slag desulphurization capability, where their functional dependency on each other we can formulate.Keywords: steel, desulphurization, sulphur distribution coefficient, sulphide capacity
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