Abstract
The development of high value-added products prepared by slag has been restricted by the severe damage to refractories occurring during SiO2–MgO-based slag melting. In the current study, the Al2O3–SiC–C refractories were selected to conduct static resistance tests with SiO2–MgO-based slag in air and reducing atmospheres. The results show favorable corrosion resistance but poor permeability resistance in both atmospheres. The poor permeability can be attributed to the cracking of brown fused alumina aggregates caused by volume expansion during the formation of magnesium aluminate spinel. In addition, a model of crack growth for the aggregate is proposed to illustrate the corrosion mechanism of the Al2O3–SiC–C refractories. It is indicated that the crack growth of the aggregate proceeds mainly along the normal direction based on the calculation of the radial and normal lengths of the crack.
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