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