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FINAL CHEMICAL AND MINERALOGICAL COMPOSITION OF OXYGEN CONVERTER SLAG
Abstract
The slag formation is a complex process consisting of several stages. There is the formation of liquid slag from individual batch materials. In the production of steel, the slag mode is chosen according to the type of apparatus, the type of processed pig iron and steel scrap, and the requirements for the grades of the steel produced. The paper focuses exclusively on primary slags from the steelmaking process in the oxygen converter. The amount of oxygen converter is about 120-150 kg per tonne of crude steel produced. The basic constituents of oxygen converter steelmaking slags are CaO, originating from slag-forming additives, SiO2 and FeO from the metal bath oxidation reactions. These three major components account for about 80% of the total. From the mineralogical point of view, the structure of the steelmaking slag consists of four main phases: dicalcium silicate 2CaO.SiO2, stabilized tricalcium phosphate 3CaO.P2O5, a solution of bivalent metals oxides, e.g. Ca, Fe, Mn, Mg, and solid solutions of calcium and aluminum ferrites 2CaO.Fe2O3 ? 2CaO.2Al2O3.Fe2O3. In some slags with high lime content, there is also tricalcium silicate 3CaO.SiO2. The steelmaking slag also contains free lime. Free lime in slag is actually a solid solution CaO-FeO or CaO-MnO containing up to 20% FeO or FeO.MnO. The chemical and mineralogical composition of steelmaking slags is variable and depends to a large extent on the production aggregate as well as on the grades of steel produced. The chemical and mineralogical composition of the steelmaking slag will be the most significant factor affecting its further potential use.
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