In this study, to clarify the corrosion mechanism of CA 6 based refractory by refining slag, the static crucible tests for CA 6 , CA 6 -Al 2 O 3 , and Al 2 O 3 refractory, were carried out and the detail reaction processes were analyzed from the perspective of thermodynamic simulation and structural evolution. From the results, CaAl 4 O 7 plays a vital role in the slag corrosion resistance of the three refractories. Regarding CA 6 refractory, the double pyramid module in CA 6 crystal structure was destroyed very quickly, leading to the rapid collapse of its structure to form the denser CaAl 4 O 7 in high amounts. As a result, a reaction layer mainly composed of CaAl 4 O 7 formed, which effectively inhibited the slag corrosion, so CA 6 refractory exhibits the most excellent slag corrosion. Meanwhile, the formation of CaAl 4 O 7 can also avoid CA 6 particles entering the molten steel to introduce exogenous inclusions. For Al 2 O 3 refractory, the generation of CaAl 4 O 7 is much slower than that of CA 6 and CA 6 -Al 2 O 3 refractory, and the amount generated is also quite small, resulting in its worst slag corrosion among the three crucibles. Therefore, CA 6 based refractory has excellent application potential in ladle refining and clean steel smelting.
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