Desulfurization of CaO–Al₂O₃–SiO₂–TiO₂ Slag System

摘要

The desulfurization ability of CaO–Al_(2)O_(3)–SiO_(2)–TiO_(2) slag at 1873 K was studied through the slag-metal desulfurization experiment by using a 10 kg inductive furnace and through theoretical calculation by using thermodynamic software FactSage. The experimental index considered were the sulfur distribution coefficient of the slag (L_(S) ) and the desulphurization ratio (η_(S) ). The effect factors were binary basicity, the mass percentage of Al_(2)O_(3) and TiO_(2). Research results are as follows. The effect of binary basicity is significant, compared with the mass percentage factors of Al_(2)O_(3) and TiO_(2). Under the optimal experimental conditions, with the binary basicity is 7, the mass percentage of Al_(2)O_(3) is 30% and TiO_(2) is 3%, the corresponding highest sulfur distribution coefficient for the slag are 58.14. While the content of TiO_(2) in the CaO–Al_(2)O_(3)–SiO_(2)–TiO_(2) slag is in a range lower than 3–4%, the desulfurization ability of the CaO–Al_(2)O_(3)–SiO_(2)–TiO_(2) slag is equal to that of the CaO–Al_(2)O_(3)–SiO_(2) slag. The slag system with TiO_(2) can meet the desulfurization requirements of steelmaking, which is a good way for resource utilization of solid waster containing titanium.