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| Slag Melting Characteristic of Slag Forming and Slag Splashing for BOF Less Slag Smelting |
| WU Wei1,MENG Hua-dong1,LIU Liu1,YUAN Tian-xiang2,BAI Yan-jiang2,YAN Zhan-hui2 |
1. Metallurgical Technology Research Department, Central Iron and Steel Research Institute, Beijing 100081,China
2. Steelmaking Works, Shougang Jingtang Iron and Steel Co Ltd, Tangshan 063200, Hebei, China |
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Abstract The slag melting characteristic of slag forming and slag splashing for 300 t BOF less slag process is researched by combining the methods of the slag chemical composition, the melting point determination and the petrographic analysis. The results show that the melting point of final slag for less slag smelting is 20 �� lower than that for conventional smelting. According to results of the petrographic analysis, the C3S (3CaO��SiO2) and C2S (2CaO��SiO2) content for less slag smelting are lower than those for conventional smelting, while the RO (FeO, MgO, MnO, etc) phase and C4AF (4CaO��Al2O3��Fe2O3) phase are higher than those for conventional smelting. According to results of the chemical analysis, the (CaO) content and slag basicity for less slag smelting are higher than those for conventional smelting, while (FeO) and (MgO) content in slag for less slag smelting are almost equal to those for conventional smelting. The reason why slag melting point for less slag smelting is lower than that for conventional smelting is that the quantity of added fluorite for less slag smelting is more than that for conventional smelting. According to the analysis results the slag melting point is determined by the C3S, C2S, RO phase and C4AF content. According to the results of slag melting characteristic before and after slag splashing for less slag smelting, the present adjusting slag process has little effect. It is important to adjust the composition of BOF final slag. The (FeO) content in slag is to be reduced at the slag splashing and adjusting slag process for less slag smelting.
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Received: 15 August 2011
Published: 25 July 2012
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2012, Vol. 19 
