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Abstract:

The freeze lining formation of an industrial non-ferrous slag with as main components CaO-FeOx-SiO2-Al2O 3-ZnO-MgO is studied to explore the different phenomena, which influence the growth of a freeze lining. Lab scale freeze layers are formed with a water-cooled probe technique. This technique consists of submerging a water-cooled probe into a liquid slag bath. Two samples with different microstructures are examined using electron microscopy, electron probe micro-analysis and X-ray diffraction. Thermodynamic software is used to interpret the solidification microstructure. The results show that the growth mechanisms of the different phases and the interaction with the liquid slag bath have an important influence on the growth of the freeze layer. Furthermore, the presence of minor elements in the slag might influence the growth of the different phases.