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| Dephosphorization pretreatment in LD converter and less-slag steelmaking process |
| ZHAO Chang-liang1,2，SUN Yan-hui1，YUAN Tian-xiang2，YAN Zhan-hui2，LUO Lei2 |
（1. School of Metallurgical and Ecological Engineering，University of Science and Technology，Beijing 100083，China
2. Steelmaking Department，Shougang Jingtang United Iron and Steel Co.，Ltd.， Tangshan 063200，Hebei，China） |
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Abstract The technology of hot metal dephosphorization pretreatment and less-slag steelmaking process was optimized step by step in Shougang Jingtang. The dephosphorization rate could reach 70% through the optimization of scrap size，bottom tuyer number and arrangement in De-P converter. The steady temperature and P content in semi-steel after the pretreatment in De-P converter can provide a good condition for the less-slag steelmaking and automatic steelmaking to achieve double hit ratios by steelmaking end. By the measurements，such as keeping slag operation，less-slag steelmaking and slag splashing technology，the automatic end-point aim can reach 90% and the lining life was more than 7 000. All the materials containing Fe，such as steel containing slag， precipitator dust，scales and so on，were all recycled in steelmaking plant. Through the dephosphorization pretreatment and less-slag steelmaking process，the quality of steel improved，the total content of S，P，N can reach less than 0.009 5% in ultra-low P and S steel grades.
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Received: 10 October 2015
Published: 26 April 2016
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| [1] |
LI Lin, LI Ming-ming, LI Qiang, ZOU Zong-shu. Melt splashing behavior of steelmaking converter with nozzle-twisted lance[J]. Iron and Steel, 2020, 55(6): 54-60. |
| [2] |
YANG Li-bin, ZENG Jia-qing, DENG Yong, XU Xiao-wei, WU Li-ping. Highly efficiency and long-life combined blowing technology of big converter[J]. Iron and Steel, 2020, 55(4): 45-52. |
| [3] |
DONG Wen-liang, PAN Hong-wei, LUO Lei, JI Chen-xi, LI Hai-bo, TIAN Zhi-hong. Phosphorous distribution in dephosphorization slag[J]. Iron and Steel, 2020, 55(2): 75-81. |
| [4] |
ZHOU Zhenyu, TANG Ping, ZHOU Zunchuan, HOU Zibing, WEN Guanghua. Optimization on nozzle parameters of 200 t combined blowing vanadium extraction converter[J]. Iron and Steel, 2019, 54(9): 50-56. |
| [5] |
WANG Linzhu，BAO Yanping，LI Xiang. Comparison of twostage dephosphorization during remaining #br# slagdouble slag process in converter[J]. Iron and Steel, 2019, 54(8): 37-42. |
| [6] |
HUANG Bing,ZHU Ming-mei,ZHONG Yong,ZHANG Ai-ping,WANG Yu. Thermodynamic calculation of phase composition of CaOSiO2FeOCr2O3MgOMnO slag system[J]. JOURNAL OF IRON AND STEEL RESEARCH , 2019, 31(8): 718-725. |
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2016, Vol. 51 
