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新一代洁净钢生产流程的理论解析

新一代洁净钢生产流程的理论解析
徐匡迪1), 肖丽俊2), 干勇2),  刘浏2), 王新华3)
1) 中国工程院, 北京 100088
2) 钢铁研究总院先进钢铁流程及材料国家重点实验室, 北京 100081
3) 首钢京唐钢铁联合有限责任公司, 唐山 063200
THEORY ANALYSIS ON THE NEW GENERATION OF CLEAN STEEL PRODUCTION PROCESS
XU Kuangdi1), XIAO Lijun2), GAN Yong2), LIU Liu2), WANG Xinhua3)
1) Chinese Academy of Engineering, Beijing 100088
2) State Key Laboratory of Advanced Steel Processes and Products, Central Iron and Steel Research Institute, Beijing 100081
3) Jing Tang Iron and Steel Corporation, Tangshan 063200
摘要: 通过对新一代洁净钢生产流程中主要元素选择性氧化还原的热力学分析, 并结合首钢京唐公司铁水“全三脱”生产洁净钢的技术实践, 研究了新一代洁净钢生产流程中S, P, C等主要元素的控制规律, 并对新一代洁净钢生产流程进行了理论解析, 提出了需要进一步解决的若干工艺问题. 研究表明: 采用CaO/CaF2脱硫剂的KR法脱硫, 可使铁水中S含量稳定地降到0.0020%以下, 终点硫的控制主要取决于脱磷转炉中的回硫量, 减少废钢和渣料等辅助材料带入的S以及适当提高脱磷炉渣碱度是减少半钢回硫量的关键; 在较低温度 (1300-1350 ℃)和较高氧位条件下造碱度合适的渣, 是脱磷转炉实现脱磷保碳的关键, 对于冶炼普通低磷钢, 将脱磷炉半钢P控制在0.03%以下, 则可将脱碳转炉终点磷控制在0.006%以下, 而对于冶炼超低磷钢, 则需将半钢P含量控制在0.008%以下, 转炉终点磷可以降低至 0.0020%以下; 脱碳转炉少渣冶炼、降低铁耗以及高碳出钢是新流程降低洁净钢生产成本和提高钢液洁净度的重要技术特征.
关键词 : 洁净钢,  脱硫,  脱磷,  铁水预处理,  选择性氧化
Abstract:Based on the thermodynamic analysis on the selective oxidation of the main elements in the new generation of clean steel production process, and the production practices of hot metal treatment in the new process of clean steel production accumulated by the Jing Tang Iron and Steel Corporation, the control of the main elements such as S, P, C, etal., were investigated, and the main characteristics of the new generation of clean steel production process were analyzed. We indicate that several production problems must be solved. The research results show that, by using KR desulphurization technology, the S content of hot metal can be steadily controlled to less than 0.0020%. The final S control of the new production process of clean steel depends mainly on the resulfurization content in the dephosphorization furnace. Increasing the slag basicity and reducing the content of S from scrap and slag forming materials can reduce the resulfurization of hot metal. The formation of proper slag basicity at relatively lower hot metal pretreatment temperature (1300-1350 ℃) and at relatively higher oxygen potential is the key to solving the problem of removing P at high C content. The P content in dephosphorization furnace, when producing common low P steel (P<0.006%), may be controlled at less than 0.03%, whereas the P content should be below 0.008% when producing ultra low P steel (P<0.002%). Less-slag smelting, lower Fe losing and high carbon tapping of decarburization furnace are the important technological characteristics of the new generation of clean steel production process.
Key words: clean steel    desulfurization    dephosphorization    hot metal pretreatment    selective oxidation
收稿日期: 2011-08-04
通讯作者: 徐匡迪     E-mail: lijxiao@163.com
Corresponding author: XU Kuangdi     E-mail: lijxiao@163.com
作者简介: 徐匡迪, 男, 1937年生, 教授, 中国工程院院士

引用本文:

徐匡迪 肖丽俊 干勇 刘浏 王新华. 新一代洁净钢生产流程的理论解析[J]. 金属学报, 2012, 48(1): 1-10.
XIAO Li-Jun, XU Kuang-Di, GAN Yong, LIU Liu, YU Xin-Hua. THEORY ANALYSIS ON THE NEW GENERATION OF CLEAN STEEL PRODUCTION PROCESS. Acta Metall Sin, 2012, 48(1): 1-10.

链接本文:

https://www.ams.org.cn/CN/10.3724/SP.J.1037.2011.00496      或      https://www.ams.org.cn/CN/Y2012/V48/I1/1PDF全文链接:点击这里

 

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