(1. Key Laboratory for Ecological Metallurgy of Multimetallic Mineral (Ministry of Education), Shenyang 110819,
Liaoning, China;2. School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China)
Abstract:In order to understand the importance of the effect of the slag structure composition on the design of converter slag and the rationalizing of the physical property of the smelting process better, the chemical composition of the molten slag during the early stage of the converter steelmaking process was simulated. Then, the melt structure of CaOSiO2FexO slag was investigated by the Raman spectroscopy, and the existing forms and transformational behaviors of structural units in the molten slag were further analyzed. The results show that the basicity of the molten slag increases with the converter steelmaking proceeding. Plenty of free oxygen ions are released by the elevating basicity, which depolymerizes complex silicate structures. The depolymerization process is Q3→ Q2→ Q1→ Q0, resulting in the reduction of the polymerization degree of the molten slag with the smelting time. Meanwhile, as the converter smelting proceeds, the [FeO6]9- octahedron was gradually replaced by the [FeO4]5- tetrahedron due to the decreasing of the Fe3+/∑Fe in the slag.
张蕊,闵义,王宇,刘承军. 冶炼前期转炉渣熔体结构的转变行为[J]. 钢铁, 2019, 54(7): 30-34.
ZHANG Rui,MIN Yi,WANG Yu,LIU Chengjun. Structural transformation of converter slags during #br# early stage of smelting process. Iron and Steel, 2019, 54(7): 30-34.