Thermodynamic Model of Calculation of Sulfur Distribution Ratio between B_2O_3-Containing Slag and Molten Steel

摘要

A thermodynamic model of calculation of sulfur distribution ratio between B_2O_3-containing slag and molten steel has been developed on the basis of the ion and molecule coexistence theory. Based on the model, the effects of B_2O_3 content and slag basicity on the sulfur distribution ratio in 1873K were investigated respectively. The results indicate that the sulfur distribution ratio decreased with increasing the content of B_2O_3, and when the content of B_2O_3 exceeds 6%, the sulfur distribution ratio was lower than 2.0. Therefore, in order to ensure the desulphurization ability of slag, the content of B_2O_3 should be controlled at about 6%. Moreover the sulfur distribution ratio can be increased by increasing the slag basicity.