铝脱氧钢与CaO-MgO-Al2O3 精炼渣反应动力学研究

doi:10.11900/0412.1961.2024.00012

金属学报

2025, Vol. 61

Issue (9): 1335-1343 DOI: 10.11900/0412.1961.2024.00012

研究论文

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铝脱氧钢与CaO-MgO-Al₂O₃ 精炼渣反应动力学研究

王博辰¹, 任英¹(

), 邝霜², 单庆林², 潘宏伟², 路博勋², 石晓伟², 王举金³, 张立峰³(

)

1 北京科技大学冶金与生态工程学院北京 100083
2 唐山钢铁集团有限责任公司唐山 063000
3 北方工业大学机械与材料工程学院北京 100144

Kinetic Study of Interaction Between Aluminum Deoxidized Steel and CaO-MgO-Al₂O₃ Refining Slag

WANG Bochen¹, REN Ying¹(

), KUANG Shuang², SHAN Qinglin², PAN Hongwei², LU Boxun², SHI Xiaowei², WANG Jujin³, ZHANG Lifeng³(

)

1 School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
2 Tangshan Iron and Steel Group Co. Ltd., Tangshan 063000, China
3 School of Mechanical and Materials Engineering, North China University of Technology, Beijing 100144, China

引用本文:

王博辰, 任英, 邝霜, 单庆林, 潘宏伟, 路博勋, 石晓伟, 王举金, 张立峰. 铝脱氧钢与CaO-MgO-Al₂O₃ 精炼渣反应动力学研究[J]. 金属学报, 2025, 61(9): 1335-1343.
Bochen WANG, Ying REN, Shuang KUANG, Qinglin SHAN, Hongwei PAN, Boxun LU, Xiaowei SHI, Jujin WANG, Lifeng ZHANG. Kinetic Study of Interaction Between Aluminum Deoxidized Steel and CaO-MgO-Al₂O₃ Refining Slag[J]. Acta Metall Sin, 2025, 61(9): 1335-1343.

全文: PDF(1912 KB) HTML

摘要:

为了研究CaO-MgO-Al₂O₃精炼渣对钢中Al₂O₃夹杂物的改性作用，本工作建立了精炼渣-钢液-夹杂物-耐火材料耦合动力学模型，研究了钢中Al含量以及渣中CaO / Al₂O₃比值对渣-钢反应中夹杂物改性的影响。结果表明，进入钢液与夹杂物中的Ca含量与钢中Al含量以及渣中CaO / Al₂O₃比值呈正相关；随着钢中Al含量从0.01%增加至0.75%，钢液中Ca含量从0.07 × 10^-6增加至1.47 × 10^-6，夹杂物中CaO含量从0.44%增加至7.89%；随着渣中CaO / Al₂O₃比值从1.0增加至2.2，钢液中Ca含量从0.15 × 10^-6增加至0.50 × 10^-6，夹杂物中CaO含量从0.88%增加至2.95%；当钢中Al含量为0.8%且CaO / Al₂O₃比值为2.2时，钢液中总钙量为2.52 × 10^-6，夹杂物中CaO含量可达到10.96%。CaO-MgO-Al₂O₃精炼渣可以将钢中Al₂O₃夹杂物改性为CaO-Al₂O₃系夹杂物，其改性程度主要与钢中Al含量有关。

关键词 ：渣-钢反应, 铝镇静钢, 夹杂物, 动力学模型

Abstract：

This research introduces a coupled dynamic model, which involves refining slag, molten steel, inclusions, and refractory materials, to explore the modification effects of CaO-MgO-Al₂O₃ refining slag on Al₂O₃ inclusions within steel. The study examines the impact of varying aluminum contents in steel and CaO / Al₂O₃ ratios in slag on inclusion modification. Notably, the Ca content in both steel and inclusions exhibits a positive correlation with the Al content in steel and the CaO / Al₂O₃ ratio in the slag. An increase in the Al content in steel from 0.01% to 0.75% led to a rise in the Ca content in the molten steel from 0.07 × 10^-6 to 1.47 × 10^-6, accompanied by an increase in the CaO content in inclusions from 0.44% to 7.89%. Additionally, elevating the CaO / Al₂O₃ ratio in the slag from 1.0 to 2.2 enhanced the Ca content in the molten steel from 0.15 × 10^-6 to 0.50 × 10^-6 and increased the CaO content in inclusions from 0.88% to 2.95%. When the Al content in the steel reached 0.8% and the CaO / Al₂O₃ ratio in the slag stood at 2.2, the total Ca content in the steel escalated to 2.52 × 10^-6, while the CaO content in inclusions surged to 10.96%. These results affirm that CaO-MgO-Al₂O₃ refining slag is capable of effectively transforming Al₂O₃ inclusions into CaO-Al₂O₃ inclusions, with the modification extent predominantly influenced by the Al content in the steel.

Key words： slag-steel reaction aluminum-killed steel inclusion kinetic model

收稿日期: 2024-01-17

ZTFLH:

TF407

基金资助:国家重点研发计划项目(2023YFB3709900);国家自然科学基金项目(U22A20171);河钢集团重点科技项目(HG-2022103)

通讯作者: 张立峰，zhanglifeng@ncut.edu.cn，主要从事钢中非金属夹杂物与冶金过程数值模拟研究;
任英，yingren@ustb.edu.cn，主要从事钢中非金属夹杂物控制研究

Corresponding author: ZHANG Lifeng, professor, Tel: 13911868419, E-mail: zhanglifeng@ncut.edu.cn;
REN Ying, professor, Tel: 13811903700, E-mail: yingren@ustb.edu.cn

作者简介: 王博辰，男，2000生，硕士生

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	王博辰
	任英
	邝霜
	单庆林
	潘宏伟
	路博勋
	石晓伟
	王举金
	张立峰
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https://www.ams.org.cn/CN/10.11900/0412.1961.2024.00012 或 https://www.ams.org.cn/CN/Y2025/V61/I9/1335

图1 精炼渣-钢液-夹杂物-耐火材料反应动力学模型示意图

Element	Mg	Al	O	Ca
Mg	$0$	-0.12	-460	0
Al	-0.13	80.5 / T	3.21 - 9720 / T	-0.047
O	-300	1.96 - 5750 / T	0.76 - 1750 / T	-515
Ca	0	-0.072	-1293	0

表1 一阶相互作用系数[40,41]

Compound	$Δ G θ = a + b T$
Compound	a	b
3CaO·Al₂O₃	-21757	-29.288
12CaO·7 Al₂O₃	617977	-612.119
CaO·Al₂O₃	59413	-59.413
CaO·2Al₂O₃	-16736	-25.522
CaO·6Al₂O₃	-22954	-31.798
MgO·Al₂O₃	-18828	-6.276

表2 CaO-MgO-Al2O3渣系中的组元及其标准Gibbs自由能(ΔGθ)[43]

图2 动力学模型计算过程示意图

图3 钢液中总氧量(T.O)、总镁量(T.Mg)、总钙量(T.Ca)和夹杂物含量的模型计算结果与实验结果[19]的对比

图4 不同Al含量下钢液中T.Mg、T.Ca及夹杂物中MgO和CaO含量的变化

图5 渣中不同CaO / Al2O3比值下钢液中T.Ca和夹杂物中CaO含量的变化

图6 钢中Al含量和渣中CaO / Al2O3比值对钢液和夹杂物终点成分的影响

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