Stabilization of metallurgical slug from arc steel-making furnaces

Abstract

At the present time the deficit of stone construction materials for transport construction points to the need for improving the range of used materials. The experience of motorway construction in economically advanced countries shows that the deficit of materials and construction costs can be significantly reduced through extensive use of industrial wastes. One promising avenue of researches is the use of metallurgical production wastes. Main methods on the prevention of slag decomposition by its stabilization are considered. The principle of increasing the stability of stone slag materials by adding a stabilizer to the steel-making slag composition during slag removal from the arc steel-making furnace, ensuring slag stabilization and prevention of the silicate decomposition after cooling, is established. Processes of the slag structure formation during its stabilization are studied. Processes of crystallisation and change of structure of dicalcium silicate are shown. The decomposition of steel-making slag can be prevented by adding a chemical stabilizer into its composition. It is established that a stabilizing agent shall consist of metallurgical production wastes that allows to fully stabilize slag and keep high-temperature modifications of belite in it when cooled. The possibility of obtaining crushed slag with a stable structure achieved by a chemical stabilization of melted slag is shown.