转炉CaO渣系加锂云母矿冶炼超低磷钢的热力学分析和工业试验

特殊钢 ›› 2016, Vol. 37 ›› Issue (3): 13-19.

转炉CaO渣系加锂云母矿冶炼超低磷钢的热力学分析和工业试验

张明博^1,2,3,仇圣桃²,朱荣¹,韩宇³

1北京科技大学冶金与生态工程学院，北京100081 ；
2钢铁研究总院连铸技术国家工程研究中心,北京100083；
3河北钢铁股份有限公司承德分公司，承德067002

收稿日期:2015-12-13 出版日期:2016-06-01 发布日期:2022-08-02
作者简介:张明博(1984-),男，博士研究生(钢铁研究总院、北京科技大学),2007年河北理工大学(专科)毕业，品种钢开发与冶炼研究。

Analysis on Thermodynamics of BOF Smelting Ultra-Low Phosphorous Steel by CaO Series Slag Adding Lepidolite and Commercial Test

Zhang Mingbo^1,2,3, Qiu Shengtao², Zhu Rong¹,Han Yu³

1 School of Metallurgical and Ecological Engineering, University of Science and Technology, Beijing 100083;
2 National Engineering and Research Center of Continuous Casting Technology, Central Iron and Steel Research Institute, Beijing 100081 ；
3 Chengde Branch, Hebei Iron and Steel Co Ltd, Chengde 067002

Received:2015-12-13 Published:2016-06-01 Online:2022-08-02

摘要/Abstract

摘要： 通过共存理论计算和热力学分析得出添加锂云母矿形成的CaO-MgO-FeO-Li₂O-Na₂O-K₂O-SiO₂-P₂O₅复合脱磷渣的渣-钢磷分配比Lp明显高于CaO-MgO-FeO-SiO₂-P₂O₅基本渣系,并确定锂云母矿的加入最佳时期是转炉吹炼前期。10炉120 t转炉冶炼的超低磷钢的结果表明,与未加锂云母矿的炉次相比,加锂云母矿可以使半钢[P]快速降低至0.044%以下,并且半钢脱磷率和磷分配比Lp分别从40.62%和13.13提高到67.71%和36.89,使转炉平均终点脱磷率和磷分配比Lp分别从92.35%和130.7提高到94.85%和191.9,转炉终点[P]可以控制在0.005%~0.007%,[P]的命中率100%,此复合渣系满足超低磷钢生产要求。

Abstract: It is obtained by coexistence theory calculation and thermodynamics analysis that the slag-steel phosphorus partition ratio Lp of compound dephosphorizing slag CaO-MgO-FeO-Li₂O-Na₂O-K2O-SiO₂-P₂O₅ is obviously higher than that of basic dephosphorizing slag series CaO-MgO-FeO-SiO₂-P₂O₅ , and defined that the optimum adding lepidolite period is the early stage of BOF blowing. The results of 10 heats 120 t BOF smelting ultra-low phosphorus steel show that as compared with the heats non-adding lepidolite, the semisteel [P] of heats by adding lepidolite decreases quickly to less than 0. 044% , the semi-steel dephosphorization ratio and phosphorus partition ratio Lp respectively increase from 40. 62% and 13.13 to 67.71% and 36. 89, and the BOF average end dephosphorization ratio and phosphorus partition increase respectively from 92.35% and 130.7 to 94. 85% and 191.9, and the BOF end [P] can be controlled in 0.005% ~0. 007% with [P] percentage of hits 100% , so the compound slag series meet the requirement of ultra-low phosphorus steel production.

Key words: BOF, Dephosphorization Slag Series, Ultra-Low Phosphorus Steel, Phosphorus Partition, Lepidolite, Coexistence Theory, Commercial Test

张明博, 仇圣桃, 朱荣, 韩宇. 转炉CaO渣系加锂云母矿冶炼超低磷钢的热力学分析和工业试验[J]. 特殊钢, 2016, 37(3): 13-19.

Zhang Mingbo, Qiu Shengtao, Zhu Rong, Han Yu. Analysis on Thermodynamics of BOF Smelting Ultra-Low Phosphorous Steel by CaO Series Slag Adding Lepidolite and Commercial Test[J]. Special Steel, 2016, 37(3): 13-19.

参考文献

［1］廖鹏,候泽旺，秦哲，等.复吹转炉双渣吹炼脱磷试验［J］. 钢铁,2013,48(1):30-36.
［2］Ishii H,Fruehan R J. Dephosphorization Equilibria Between Liquid Iron and Highly Basic CaO-Based Slags Saturated with MgO ［ J］. Ironmaking and Steelmaking, 1997,24 (2) ：47-55.
［3］乐可襄，王世俊,王海川，等.在铁水预处理中CaO-Fe₂O₃-CaF₂ 基粉剂脱磷工艺和影响因素的探讨[J］.钢铁,2002,37(7):20- 22.
［4］田志红，孔祥涛,蔡开科，等.BaO-CaO-CaF₂系渣用于钢液深脱磷能力[J］.北京科技大学学报,2005,27(3):294-299.
［5］Suite H,Inoue R. Thermodynamic Assessment of Hot Metal and Steel Dephosphorization with MnO-Containign BOF Slags ［J］. ISIJ International ,1995,35(3) ：258-265.
［6］陈家祥.炼钢常用数据图表手册［M］.北京:冶金工业出版社， 1984.
［7］张鉴.冶金熔体和溶液的计算热力学［M］.北京:冶金工业出版社,2007.
［8］郭汉杰.冶金物理化学教程(第二版)［M］,北京:冶金工业出版社,2006.
［9］史成斌，郭汉杰，丁汝才，等.CaO-SiO₂-MgO-Al₂O₃渣系与碳饱和铁液间硫分配比的热力学模型［J］.过程工程学报,2010,10 (1S)：158-164.
[10]Kume K, Morita K,Miki T,et al. Activity Measurement of CaO- MgO-Al₂O₃ -SiO₂ Slag Equilibrated with Molten Silicon Alloys [J]. ISIJ International,2000,40(6) ：561-566.
[11]叶大伦，胡建华.无机物热力学数据手册(第二版)[M].北京：冶金工业出版社,2002.
[12]Somnath B, Ashok Kumar L, Seshadri S. A Model for Activity Coefficient of P₂O₅ in BOF Slag and Phosphorus Distribution Between Liquid Steel and Slag [J]. ISIJ International, 2007,47 (8): 1236-1238.
[13]林路,包燕平，王敏,等.转炉冶炼CaO-SiO₂-FeO渣系中磷的行为[J].北京科技大学学报,2013,35(6):720-724.