超低碳钢RH混合喷吹Ar-CO<sub>2</sub>冶金反应特性

doi:10.13228/j.boyuan.issn0449-749x.20210526

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Abstract The resource utilization of CO₂ during iron and steel production process makes a valuable contribution towards achieving the target of “carbon peak and carbon neutralization”. Ar-driven RH (ruhrstahl–heraeus) vacuum device is the key equipment for decarburization of ultra-low carbon steel, and the decarburization, degassing and inclusion removal can be effectively achieved by circulation flow of liquid steel in high vacuum. Since CO₂ can directly react with carbon in the liquid steel to form CO, the decarburization can be realized and the bath stirring can be strengthened. Therefore, an attempt was made to introduce the Ar-CO₂ mixed gas, as the lifting gas, into the RH decarburization process of ultra-low carbon steel. Firstly, the thermodynamic analysis between Fe-C-O melt and Ar-CO₂ was carried out to study the metallurgical reaction behavior under different pressures in RH refining conditions. Then, an industrial test platform for taking Ar-CO₂ mixed gas as RH lifting gas was built, and the effect of Ar-CO₂ mixed injection on decarburization, denitrification and temperature drop of liquid steel during RH decarburization process of ultra-low carbon steel was investigated by industrial tests. Thermodynamic analysis between Fe-C-O melt and Ar-CO₂ shows that CO₂ can react with carbon in the molten steel under conditions of low atmospheric pressure and ultra-low carbon content, and RH decarburization and degassing can be accelerated. Industrial test indicates that the average carbon content in molten steel after RH treatment with 100% CO₂, 50% Ar+50% CO₂ and 100% Ar injection are 0.001 50%, 0.001 57% and 0.001 19%, respectively, and thus the decarburization efficiency is not significantly affected by Ar-CO₂ mixed injection. Meanwhile, compared with 100% Ar injection, 100% CO₂ and 50% Ar+50% CO₂ injection have slight effect on RH denitrification efficiency and temperature drop of molten steel because the reaction of CO₂ with carbon is quite limited. Therefore, CO₂ can be used to partially or completely replace the Ar during RH decarburization process of ultra-low carbon steel based on economic and environmental considerations, although the refining efficiency cannot be improved.

Key words： RH ultra-low carbon steel CO₂ decarburization denitrification temperature drop

Received: 01 September 2021

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	CHEN Gu-jun
	YANG Jiang
	LI Long
	ZHANG Min
	HE Sheng-ping

Cite this article:

CHEN Gu-jun,YANG Jiang,LI Long等. Metallurgical reaction behavior of Ar-CO₂ mixed injection during RH refining process[J]. Iron and Steel, 2022, 57(3): 55-60.

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http://www.chinamet.cn/Jweb_gt/EN/10.13228/j.boyuan.issn0449-749x.20210526 OR http://www.chinamet.cn/Jweb_gt/EN/Y2022/V57/I3/55

[1] 张琦, 张薇, 王玉洁, 等. 中国钢铁工业节能减排潜力及能效提升途径[J]. 钢铁, 2019, 54(2): 7. (ZHANG Qi, ZHANG Wei, WANG Yu-jie, et al. Potential of energy saving and emission reduction and energy efficiency improvement of China′s steel industry[J]. Iron and Steel, 2019, 54(2): 7.)
[2] 张薇, 王玉洁, 刘帅, 等. 基于CSC方法的钢铁行业节能减排技术潜力分析[J]. 中国冶金, 2019, 29(1): 70. (ZHANG Wei, WANG Yu-jie, LIU Shuai, et al. Analysis of energy conservation and emission reduction potential in iron and steel industry based on CSC method[J]. China Metallurgy, 2019, 29(1): 70.)
[3] 吕明, 朱荣, 毕秀荣, 等. 二氧化碳在转炉炼钢中的应用研究[J]. 北京科技大学学报, 2011, 33(增刊1): 126.(LÜ Ming, ZHU Rong, BI Xiu-rong, et al. Application research of carbon dioxide in BOF steelmaking process[J]. Journal of University of Science and Technology Beijing, 2011, 33(s1): 126.)
[4] 宁晓钧, 尹振江, 易操, 等. 利用CO₂减少炼钢烟尘的实验研究[J]. 炼钢, 2009, 25(5): 32. (NING Xiao-jun, YIN Zhen-jiang, YI Cao, et al. Experimental research on dust reduction in steelmaking by CO₂[J]. Steelmaking, 2009, 25(5): 32.)
[5] 吉立鹏, 张丙龙, 曾卫民. 基于石灰窑回收CO₂用于炼钢的关键技术分析[J]. 中国冶金, 2019, 29(3): 49. (JI Li-peng, ZHANG Bing-long, ZENG Wei-min. Analysis on key technologies of CO₂ recovery from lime kiln for steelmaking[J]. China Metallurgy, 2019, 29(3): 49.)
[6] YI C, ZHU R, CHEN B Y, et al. Experimental research on reducing the dust of BOF in CO₂ and O₂ mixed blowing steelmaking process[J]. ISIJ International, 2009, 49(11): 1694.
[7] GU Y, WANG H, ZHU R, et al. Study on experiment and mechanism of bottom blowing CO₂ during the LF refining process[J]. Steel Research International, 2014, 85(4): 589.
[8] 董凯, 朱荣, 刘润藻, 等. LF 炉底吹 CO₂气体对钢液质量影响及透气砖侵蚀的研究[J]. 北京科技大学学报, 2014(增刊1): 226. (DONG Kai, ZHU Rong, LIU Run-zao, et al. Influence of bottom blowing CO₂ in LF on molten steel quality and erosion of ventilated bricks[J]. Journal of University of Science and Technology Beijing, 2014(s1): 226.)
[9] 毕秀荣,朱荣,刘润藻, 等. CO₂-O₂混合喷吹工艺冶炼不锈钢的基础研究[J]. 炼钢, 2012, 28(2): 67. (BI Xiu-rong, ZHU Rong, LIU Run-zao, et al. Fundamental research on CO₂ and O₂ mixed injection stainless steelmaking process[J]. Steelmaking, 2012, 28(2):67.)
[10] WEI G S, ZHU R, WU X T, et al. Study on the fluid flow characteristics of coherent jets with CO₂ and O₂ mixed injection in electric arc furnace steelmaking processes[J]. Metallurgical and Materials Transactions B-Process Metallurgy and Materials Processing Science, 2018, 49(3): 1405.
[11] 李全, 王欢, 朱荣, 等. 二氧化碳作为连铸保护气体的试验研究[J]. 连铸, 2015(2): 5. (LI Quan, WANG Huan, ZHU Rong, et al. Experimental research on using CO₂ as shielding gas in continuous casting[J]. Continuous Casting, 2015(2): 5.)
[12] 刘畅, 李树森, 张立峰. RH精炼过程中气液两相流动及混匀现象的模拟研究[J]. 金属学报, 2018, 54(2): 347. (LIU Chang, LI Shu-sheng, ZHANG Li-feng. Simulation of gas-liquid two-phase flow and mixing phenomena during RH refining process[J]. Acta Metallurgica Sinica, 2018, 54(2): 347.)
[13] 刘彬, 陈永洪, 杨龙川, 等. 250 t钢包RH精炼脱碳动态控制实践[J]. 中国冶金, 2020, 30(5): 70. (LIU Bin, CHEN Yong-hong, YANG Long-chuan, et al. Dynamic decarburization control practice for 250 t steel ladle RH refining[J]. China Metallurgy, 2020, 30(5): 70.)
[14] 王胜, 窦为学, 徐海强, 等. 单嘴浸渍管RH和弓形浸渍管RH的应用效果[J]. 中国冶金, 2020, 30(3): 60. (WANG Sheng, DOU Wei-xue, XU Hai-qiang, et al. Application effects of single snorkel RH and arched snorkel RH[J]. China Metallurgy, 2020, 30(3): 60.)
[15] HAN B C, ZHU R, ZHU Y Q, et al. Research on selective oxidation of carbon and aluminum with introduction of CO₂ in RH refining of low-carbon steel process[J]. Metallurgical and Materials Transactions B-Process Metallurgy and Materials Processing Science, 2018, 49(6): 3544.
[16] 魏光升, 韩宝臣, 朱荣. CO₂作为RH提升气的冶金反应行为研究[J]. 工程科学学报, 2020, 42(2): 203. (WEI Guang-sheng, HAN Bao-chen, ZHU Rong. Metallurgical reaction behavior of CO₂ as RH lifting gas[J]. Chinese Journal of Engineering, 2020, 42(2): 203.)
[17] HAN B C, WEI G S, ZHU R, et al. Utilization of carbon dioxide injection in BOF-RH steelmaking process[J]. Journal of CO₂ Utilization, 2019, 34(12): 53.
[18] 朱益强, 朱荣, 王雪亮. CO₂作为RH提升气体的热力学分析[J]. 工业加热, 2017, 46(6): 7. (ZHU Yi-qiang, ZHU Rong, WANG Xue-liang. Thermodynamics analysis of regard CO₂ as RH ascending gas[J]. Industrial Heating, 2017, 46(6): 7.)
[19] CHEN G J, YANG J, LI L, et al. Thermodynamic and experimental study on CO₂ injection in RH decarburization process of ultra-low carbon steel[J]. Journal of CO₂ Utilization, 2021, 50(8): 101586.
[20] 康伟, 栗红, 陈本文. RH喷吹CaCO₃粉剂深脱碳[C]//第十八届(2014年)全国炼钢学术会议论文集——S05:炉外精炼.西安:中国金属学会, 2014: 6. (KANG Wei, LI Hong, CHEN Ben-wen. Deep decarbonization by injecting CaCO₃ dust into RH[C]//The 18th National Conference Proceedings on Steelmaking——S05: Secondary Refining. Xi′an:The Chinese Society for Metals, 2014: 6.)
[21] 林洋, 唐复平, 沈明钢, 等. RH碳酸盐分解CO₂脱碳工艺[J]. 钢铁, 2016, 51(5): 42. (LIN Yang, TANG Fu-ping, SHEN Ming-gang, et al. Decarburization by carbonate decomposition of CO₂ in RH process[J]. Iron and Steel, 2016, 51(5): 42.)
[22] GUO J L, ZHAO L H, BAO Y P, et al. Carbon and oxygen behavior in the RH degasser with carbon powder addition[J]. International Journal of Minerals, Metallurgy and Materials, 2019, 26(6): 681.
[23] 郭建龙. 基于碳、氧、温度协调控制的超低碳钢RH关键技术研究[D]. 北京: 北京科技大学, 2019. (GUO Jian-long. Research on RH Key Technology of Ultra-Low Carbon Steel Based on Coordinated Control of Carbon, Oxygen and Temperature[D]. Beijing: University of Science and Technology Beijing, 2019.)
[24] Kim H S, Kim J G, Sasaki Y. Forward and backward reaction rate constants of the reaction of CO-CO (g) on Fe-C melts[J]. ISIJ International, 2010, 50(5): 678.
[25] 严红燕, 罗超, 胡晓军, 等. CO₂在钢铁工业资源利用现状[J]. 有色金属科学与工程, 2018, 9(6): 26. (YAN Hong-yan, LUO Chao, HU Xiao-jun, et al. Utilization status of CO₂ in iron and steel industries[J]. Nonferrous Metals Science and Engineering, 2018, 9(6): 26.)
[26] CHEN G J, HE S P. Modeling fluid flow and carbon removal in the Ruhrstahl-Heraeus reactor: Considering the pumping process[J]. Industrial and Engineering Chemistry Research, 2019, 58(40): 18855.