| Summary: | The mechanism of lime dissolution in steelmaking slag and the factors that influence the dissolution rate are highly significant in improving the efficiency of the steelmaking process; however, they are yet to be fully understood. Here, the effects of Al<sub>2</sub>O<sub>3</sub>/TiO<sub>2</sub>/Na<sub>2</sub>O additives on the dissolution rate of lime and the composition of molten slag were investigated using a rotating cylinder technique. The results indicate that the promotion coefficients at 1400 °C decrease in the order of Na<sub>2</sub>O > TiO<sub>2</sub> > Al<sub>2</sub>O<sub>3</sub>. Furthermore, the CaO dissolution rate and kinetic parameters were calculated, and the lime dissolution mechanisms in the presence or absence of Al<sub>2</sub>O<sub>3</sub>, TiO<sub>2</sub>, and Na<sub>2</sub>O were compared. Additionally, the data show that ATN (a mixture with a mass ratio of Al<sub>2</sub>O<sub>3</sub>:TiO<sub>2</sub>:Na<sub>2</sub>O = 15:4:3) can be used as a suitable flux in the steelmaking process.
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