Temperature Control Model for

Special Steel ›› 2017, Vol. 38 ›› Issue (6): 1-5.

Temperature Control Model for "Dephosphorization Windown"of Double Slag Process of Top and Bottom Combined Converter

Wang Chengyi, Yang Libin, Lin Tenge hang, Wang Jie, Zeng Jiaqing

Institute for Metallurgical Process, Central Iron and Steel Research Institute, Beijing 100081

Received:2017-06-01 Online:2017-12-01 Published:2022-07-05

顶底复吹转炉双渣冶炼“脱磷窗口”温度控制模型

汪成义, 杨利彬，林腾昌，王杰，曾加庆

钢铁研究总院冶金工艺研究所，北京100081

作者简介:汪成义(1989-)，男，硕士(2015年北京科技大学)，工程师，2012年安徽工业大学(本科)毕业，炼钢及连铸工艺研究。
基金资助:
国家自然科学基金项目资助(51674092)

Abstract

Abstract: Based on thermodynamics on dephosphorizing oxidation reaction, the dephosphorizing equilibrium tempera ture of semi-steel by the C-P-Fe coupling action and the dephosphorizing equilibrium temperature of BOF end liquid by the P-Fe action are studied, and the temperature control model for "dephosphorization window" of double slag process is put forward. And the dephosphorizing test of 46 heats 45t top and bottom combined converter double slag process is carried out to obtain the effect of first turning-down temperature of liquid and BOF end temperature on dephosphorization rate and phosphorus distribution ratio. By theoretical calculation and process test analysis it is obtained that with present hot metal/% : 4.41C, 0.41Si, 0.19Mn, 0.128P, 0.034S, 1250~1300℃,and end liquid/% : 0.08C, 0.01Si, 0.06Mn, 0.0090P, 0.017S, 1600~1660°C and relative process conditions, by the first turning-down temperature of liquid being controlled between 1400℃ and 1440℃ and the BOF end temperature being controlled between 1610℃ and 1650℃ the dephosphorization rate in first turning-down period is up to 62.1% , the end dephosphorization rale of liquid is up to 93.9% , and the end phosphorus content in liquid decreases from original 0.0090% to 0.0078% .

Key words: Top and Bottom Combined Blown Converter, Double Slag Process, Dephosphorization Thermodynamics, First Turning-down Temperature of Liquid, End Temperature, Control Model

摘要： 根据脱磷氧化反应热力学研究了C-P-Fe耦合作用下的半钢脱磷平衡温度以及P-Fe作用下的转炉冶炼终点钢水脱磷平衡温度,提出了双渣法冶炼"脱磷窗口"的温度控制模型。并进行了46炉45t顶底复吹转炉双渣法脱磷试验,得出转炉一次倒炉钢液温度和终点温度对脱磷率和磷分配比的影响。通过理论计算和工艺试验分析得出,一次倒炉钢液温度控制在1400~1440℃,冶炼终点温度控制在1610~1650℃时,在目前铁水/%:4.41C,0.41Si,0.19Mn,0.128P,0.034S,1250~1300℃,终点钢水/%:0.08C,0.01Si,0.06Mn,0.0090P,0.017S,1600~1660℃和相关工艺条件下,可使一次倒炉钢液脱磷率达到62.1%,终点脱磷率达到93.9%,终点磷含量由原0.0090%降低至0.0078%。

关键词: 顶底复吹转炉, 双渣工艺, 脱磷热力学, 一次倒炉钢液温度, 终点温度, 控制模型

Wang Chengyi, Yang Libin, Lin Tenge hang, Wang Jie, Zeng Jiaqing. Temperature Control Model for "Dephosphorization Windown"of Double Slag Process of Top and Bottom Combined Converter[J]. Special Steel, 2017, 38(6): 1-5.

汪成义, 杨利彬, 林腾昌, 王杰, 曾加庆. 顶底复吹转炉双渣冶炼“脱磷窗口”温度控制模型[J]. 特殊钢, 2017, 38(6): 1-5.

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