Abstract
The article presents the results of the investigation of changes in the chemical and mineralogical composition of slag during steel production in a blown oxygen converter. This process was monitored using the slag samples that were collected during the period when oxygen blowing into an oxygen converter was interrupted. The slag samples were collected after 150 s (2.5 min), then after 5, 8, 11, and 24 min of oxygen blowing, and in minute 27 when oxygen blowing was terminated. The sampling was carried out within five consecutive melting processes. The article presents and documents the changes in the contents of CaO, CaO (free), Fe (total), FeO, SiO2, and in the basicity of the slag during oxygen blowing. It also provides the characteristics of individual structural components formed during oxygen blowing and a detailed description of the lime assimilation process, including the formation of the final structure of the slag, consisting of dicalcium silicate (2CaO·SiO2), tricalcium silicate (3CaO·SiO2), RO-phase, and calcium ferrites (2CaO·Fe2O3). The results of the investigation of the changes in the chemical composition of the slag during oxygen blowing in an oxygen converter were compared with the changes in the structural composition of the slag.
Highlights
IntroductionMetallurgical slags play an important role in the processes of steel production and treatment
Metallurgical slags play an important role in the processes of steel production and treatment.The knowledge of the formation and development of chemical and mineralogical properties of steel slags is essential
It is important to know the key factors influencing the rate of slag formation
Summary
Metallurgical slags play an important role in the processes of steel production and treatment. The knowledge of the formation and development of chemical and mineralogical properties of steel slags is essential. Steel production in oxygen converters is primarily characterised by a high rate of individual operations and this must be considered when determining the slag production rate. It is important to know the key factors influencing the rate of slag formation. Slags must have the required physical and chemical properties to fulfil its purpose during the steel production. Last but not least, the final chemical and mineralogical composition of slag has a significant impact on its final properties and, its further utilization. The chemical and mineralogical compositions of steelmaking slags were directly linked
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