Al2O3-SiC-C based castables for main hot metal runners are produced from fused brown corundum(8～5 mm,5～3 mm,3～1 mm),fused dense corundum(1～0 mm,≤0.088 mm),90 defective spinel(200 mesh,2 µm),78 spinel(1～0 mm,200 mesh,500 mesh),98 silicon carbide(1～0 mm,≤0.088 mm),spherical asphalt,calcium aluminate cement,and activated micro alumina as the main raw materials.The impact of the two types of spinels on the performance of Al2O3-SiC-C castable is studied in terms of particle size and addition amount.The experimental result shows that:1)as the particle size of spinel decreases,the viscosity of the castable decreases,the exhaust performance increases,and the flowability and bulk density show an increasing trend;2)After being treated at different temperatures,the compressive strength,flexural strength,and erosion resistance of samples show a trend from initial increasing to decreasing;3)With the increase of magnesium oxide content in spinel,the compressive strength and corrosion resistance of samples increase.
Defective spinelAntioxidant activityResistance to erosion
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