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针对铝酸钙系精炼钢包铸余渣代替萤石作为转炉助熔剂对脱磷效率的影响,首先利用Factsage热力学软件对比计算分析了Al_2O_3、Ca F_2作为转炉炉渣助熔剂,对脱磷产物活度及磷容量的影响规律,并在实验室硅钼炉上对脱磷效率影响规律进行了对比研究。在此基础上,研究了精炼钢包铸余渣代替萤石的替代比例及应用效果。结果表明,分别以Al_2O_3、Ca F_2作为转炉脱磷助熔剂时,二者对炉渣碱度的控制要求相当;Ca F_2的助熔能力明显强于Al_2O_3,而Al_2O_3能降低脱磷产物的活度,增加炉渣磷容量,相比Ca F_2对脱磷反应具有热力学优势;w((Al_2O_3))为5.0%~9.0%的炉渣达到的脱磷效率,与w((Ca F_2))为3.0%~6.0%时相当;用武钢铝酸钙系钢包精炼铸余渣代替萤石作为转炉炼钢脱磷助熔剂,其与萤石的替换比例为2.5∶1,冶炼过程炉渣熔化良好,转炉终点钢水脱磷率提高3.0%左右。
Aiming at the influence of calcium aluminate-based ladle slag instead of fluorite as converter flux on dephosphorization efficiency, first, using Factsage thermodynamic software to calculate and analyze Al 2 O 3 and Ca F 2 as converter slag flux, Phosphorus content of the law, and in the laboratory silicon molybdenum furnace on the dephosphorization efficiency of the law were compared. On this basis, the replacement proportion and application effect of refined ladle slag instead of fluorite were studied. The results show that when Al_2O_3 and CaF_2 are used as dephosphorization fluxes for converter respectively, the control requirements for slag basicity are quite similar. The fluxing ability of CaF_2 is obviously stronger than that of Al_2O_3. Al_2O_3 can reduce the activity of dephosphorization products, Increasing the capacity of slag phosphorus has a thermodynamic advantage over that of CaF_2 in the dephosphorization reaction. The dephosphorization efficiency of slag with w ((Al_2O_3)) of 5.0% ~ 9.0% is in agreement with that of w ((CaF_2)) 3.0% ~ 6.0 % Of the time; with Wuhan Iron and Steel Caustic soda ladle refining residue instead of fluorite as a converter steelmaking dephosphorization flux, and fluorite replacement ratio of 2.5: 1, smelting process slag melts well, the final dephosphorization of molten steel converter Rate increased by about 3.0%.