Industrial practice of deep dephosphorization technology with less slag in converter

Wang Duogang; Guo Peimin; Cheng Nailiang; Xia Yunjin

doi:10.7513/j.issn.1004-7638.2021.05.029

Volume 42 Issue 5

Oct. 2021

Turn off MathJax

Article Contents

Article Navigation > IRON STEEL VANADIUM TITANIUM > 2021 > 42(5): 186-191

Wang Duogang, Guo Peimin, Cheng Nailiang, Xia Yunjin. Industrial practice of deep dephosphorization technology with less slag in converter[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(5): 186-191. doi: 10.7513/j.issn.1004-7638.2021.05.029

Citation:

Wang Duogang, Guo Peimin, Cheng Nailiang, Xia Yunjin. Industrial practice of deep dephosphorization technology with less slag in converter[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(5): 186-191. doi: 10.7513/j.issn.1004-7638.2021.05.029

Citation:

PDF( 1002 KB)

Industrial practice of deep dephosphorization technology with less slag in converter

doi: 10.7513/j.issn.1004-7638.2021.05.029

1.
The State Key Laboratory for Advanced Iron and Steel Process and Materials, Central Iron and Steel Research Institute, Beijing 100081, China
2.
Shanghai Meishan Iron and Steel Co., Ltd., Nanjing 210039, Jiangsu, China
3.
School of Metallurgical Engineering, Anhui University of Technology, Ma′anshan 243000, Anhui, China

Received Date: 2021-09-24
Publish Date: 2021-10-30

Abstract

Abstract

In this paper, the industrial practice of deep dephosphorization with less slag in dephosphorization period was carried out on 250 ton converter of Meigang. The effects of smelting temperature, slag composition and blowing system on phosphorus content in molten steel were studied. The practice shows that at the end of the dephosphorization period of converter smelting, the appropriate bath temperature is 1370～1420 ℃, the basicity of slag is 1.3～1.8, and the FeO content in slag is 18%～28%; The suitable oxygen blowing amount in the dephosphorization period of converter smelting is 24%～28% of the total oxygen flow, the scrap ratio is controlled at 12%～16%, and the number of bottom blowing holes is more than 8. Through above parameters optimization, average dephosphorization rate in converter smelting dephosphorization period of Meigang was increased from less than 50% to 63.2%, and finally achieved stable operation of the less slag process. During period from year 2012 to 2019, the less slag smelting proportion was increased from 0 to 83.7%, and the lime consumption per ton of steel was reduced from 53.3 kg to 23.2 kg, decrease by 56.5%.
- converter,
- less slag smelting,
- dephosphorization

FullText(HTML)

References(12)

References

[1]	中国钢铁工业年鉴编委会. 中国钢铁工业年鉴2020[M]. 北京: 冶金工业出版社, 2020. The Editorial Board of China Steel Yearbook. China steel yearbook 2020[M]. Beijing: Metallurgical Industry Press, 2020
[2]	Xia Yunjin, Guo Xin, Ma Weijie, et al. Effect of change of slag phase on dephosphorization of “double-slag+slag-remaining” steelmaking technology[J]. Journal of Iron and Steel Research, 2018,30(6):434−440. (夏云进, 郭鑫, 马伟杰, 等. 炉渣物相变化对“双渣+留渣”冶炼脱磷的影响研究[J]. 钢铁研究学报, 2018,30(6):434−440.
[3]	Inoue R, Suito H. Phosphorous partition between 2CaO·SiO₂ particles and CaO-SiO₂-Fe_tO slags[J]. ISIJ International, 2006,46(2):174−179. doi: 10.2355/isijinternational.46.174
[4]	Suito H, Inoue R. Behavior of phosphorous transfer from CaO-Fe_tO-P₂O₅(-SiO₂) slag to CaO particles[J]. ISIJ International, 2006,46(2):180−187. doi: 10.2355/isijinternational.46.180
[5]	Inoue R, Suito H. Mechanism of dephosphorization with CaO-SiO₂-Fe_tO slags containing mesoscopic scale 2CaO·SiO₂ particles[J]. ISIJ International, 2006,46(2):188−194. doi: 10.2355/isijinternational.46.188
[6]	Kashiwaya Y, Son P K. Growing process of crystal precipitated in the dephosphorization slag and phosphorous partition between crystal and liquid[J]. Tetsu-to-Hagané, 2009,95(3):251−257.
[7]	Fukagai S, Hamano T , Tsukihashi F. Formation reaction of phosphate compound in multi phase flux at 1573 K[J]. ISIJ Int. 2007, 47(1): 187-189.
[8]	Saito R, Matsuura H, Nakask K, et al. Microscopic formation mechanisms of P₂O₅-containing phase at the interface between solid CaO and molten slag[J]. Tetsu-to-Hagané, 2009,95(3):258−267.
[9]	Xia Y J, Li J, Fan D D, et al. Effects of interfacial oxygen potential and slag phase changing during slag formation process on dephosphorization behavior[J]. ISIJ Int., 2019,59(9):1519−1526. doi: 10.2355/isijinternational.ISIJINT-2019-052
[10]	Xia Y J, Li J, Fan D D, et al. Effect of adding mode of iron oxide on dephosphorization behavior with the recycling of decarburization slag[J]. Steel Research Int., 2018,89(2):1800104.
[11]	Wang Xinhua, Zhu Guosen, Li Haibo, et al. Investigation on “slag-remaining+double-slag” BOF steelmaking technology[J]. China Metallurgy, 2013,23(4):40−46. (王新华, 朱国森, 李海波, 等. 氧气转炉“留渣+双渣”炼钢工艺技术研究[J]. 中国冶金, 2013,23(4):40−46.
[12]	陈家祥. 钢铁冶金学[M]. 北京: 冶金工业出版社, 2005: 82. Chen Jiaxiang. Ferrous metallurgy[M]. Beijing: Metallurgical Industry Press, 2005: 82.