Overview
ABSTRACT
Slag represents the mixture of molten oxides supernatant above cast iron or steel, it consists essentially of silica, alumina and lime. Refractory compositions are more varied, as they can be chromium or magnesium based. Slag is responsible for the interaction with the metal. By playing on its composition, it is possible to move an enhancing element towards the metal or, conversely, a deleterious element towards the slag. This article discusses slag and refractory focusing on the physical properties, such as viscosity and base number. The various thermodynamic slag models are then discussed, as well as the notions of element partition coefficients, and their capacities in of sulphur, nitrogen and phosphorus.
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Read the articleAUTHOR
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Pierre PERROT : Professor Emeritus, Physical Metallurgy Laboratory - Lille University of Science and Technology
INTRODUCTION
Slag is the name given to the mixture of molten oxides supernatant on cast iron or steel. They play an important role in controlling the distribution of elements between the metal, which must contain valuable elements, and the slag, which must contain harmful elements such as sulfur and phosphorus. .
The adage "take care of the slag and the steel will take care of itself" still applies today.
This article deals with slags and refractories, focusing on physical properties such as phase diagrams and viscosity, as well as on the notion of slag basicity.
Thermodynamic slag models, elemental partition coefficients, sulfur, nitrogen and phosphorus capacities are also discussed.
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Thermodynamic equilibrium in the steel industry - Slag and refractory
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