Sulphide capacity of CaO-SiO₂-8%MgO-Al₂O₃-BaO slags ranging from 0% to 5% in BaO

Abstract

The sulphide capacities of CaO-SiO2-MgO-Al2O3-BaO slags were measured at 1773 K and 1823 K using the gas-slag equilibration method to estimate the desulphurization ability of the blast furnace slags that contained barium. The effects of basicity, the Al2O3 and BaO content of slags on the sulphide capacity of slags were studied. The relationship between the sulphide capacity and the optical basicity of the slags was also investigated. The experimentally determined results were compared with the sulphide capacities estimated by some previously reported models. The results showed that the sulphide capacity increased significantly when the basicity (CaO/SiO2) increased from 1.0 to 1.2, but decreased when the Al2O3 content increased in the slag. The increasing BaO content increased the sulphide capacity. The desulphurizing ability decreased when the BaO content was more than 3.5%. There was a linearly increasing relationship between the optical basicity and the sulphide capacity. The experimentally determined sulphide capacities were closest to the predicted values obtained by the Sosinsky and Sommerville’s model.

Research Progress of Desulfurization Refining Slag: A Review

“…In recent years, metallurgists have begun to consider using BaO or Li 2 O to replace part of CaO in slags and B 2 O 3 to replace part of CaF 2 to develop a new slag system with strong desulfurization ability, fast slag melting speed, and good fluidity. [37,38] Song et al [39] found that as BaO content increased, slag viscosity decreased, providing a better kinetic environment for desulfurization. Wang [40] found that substituting an equivalent number of CaF 2 with B 2 O 3 significantly enhanced the desulfurization ability of the flux.…”

Effect of Al 2 O 3 on viscosity and structure of CaO–SiO 2 –FeO t –(Al 2 O 3 )–BaO slag

“…The effect of Al 2 O 3 on structure of CaO-SiO 2 -FeO t -(Al 2 O 3 )-BaO was researched by FTIR, Raman and XPS. In addition, BaSO 4 is contained in the iron ore of Jiuquan steel company of China, which can decompose into BaO by high temperature [17][18][19][20][21][22]. Sintered ore is usually used in production process of BOF.…”

Influence of BaO on viscosity and structure of CaO–SiO 2 –Fe t O–Al 2 O 3 –BaO steel slag

“…Iron ore used in Jiuquan steel company of China often contains BaSO 4 [1][2][3][4]. BaSO 4 will turn into BaO at high temperature.…”