Variation of slag viscous flow characteristics at different blowing stages in converter
CAI Kun-kun1, ZHANG Zhao-hui1, LÜ Ming1, LI Dong-lin1, XI Xiao-feng2, GUO Hong-min2
1. School of Metallurgical Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, Shaanxi, China; 2. Shaanxi Longmen Iron and Steel Co., Ltd., Hancheng 715045, Shaanxi, China
Abstract:To clarify the variation mechanism of furnace slag viscous flow characteristics in different stages of converter blowing. According to typical converter slag compositions during different stages, the effects of basicity, FeO, MgO, MnO and Al2O3 on the viscosity of CaO-SiO2-FeO-MgO-MnO-Al2O3 converter slag was studied by using Factsage thermodynamic simulation software. The suitable basicity of converter slag, reasonable FeO, MgO, MnO and Al2O3 contents in converter slag during different stages were given in combination with production practice. The results showed that the viscosity of converter slag decreased gradually with the increase of temperature under different alkalinity conditions, and the viscosity of converter slag increased first and then decreased with the increase of alkalinity under different temperature conditions. The viscosity of furnace slag is greatly affected by the content of FeO, MgO and Al2O3, while the content of MnO had relatively little effect on the viscosity of furnace slag. The fluidity of furnace slag is mainly related to the polymerization degree of furnace slag structure and the mass fraction of solid phase in furnace slag. The increase of FeO, MgO and Al2O3 content could destroy the network structure of silicate polymer in slag, and excess MgO could easily lead to the precipitation of high melting point solid phase in slag. When the content of Al2O3 is low, it exists in furnace slag in the form of complex tetrahedral structure AlO5-4, which is easy to form high melting point substances such as calcium aluminate, thus changing the fluidity of furnace slag. The actual production considered that in the early stage of converter smelting, the basicity of slag is controlled at about 1.4-1.5, the content of FeO,MgO,MnO and Al2O3 was controlled at about 20%, about 6%-8%, above 6% and about 3%-5%, respectively. The viscosity of slag is suitable and the fluidity of slag was well. In the middle and later stages of converter smelting, the basicity of slag should be controlled at about 3.0-3.5, the content of FeO, MgO, MnO and Al2O3 should be controlled about 15%-20%, about 6%-8%,about 3%-6% and below 3%,respectively. The furnace slag has well fluidity.
蔡坤坤, 张朝晖, 吕明, 李东林, 习晓峰, 郭红民. 转炉吹炼不同阶段炉渣黏流特性变化[J]. 钢铁, 2023, 58(4): 69-76.
CAI Kun-kun, ZHANG Zhao-hui, LÜ Ming, LI Dong-lin, XI Xiao-feng, GUO Hong-min. Variation of slag viscous flow characteristics at different blowing stages in converter[J]. Iron and Steel, 2023, 58(4): 69-76.
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