|
|
Double Slag Operation Dephosphorization in BOF for Producing Low Phosphorus Steel |
TIAN Zhi-hong,LI Ben-hai,ZHANG Xiao-ming,JIANG Zhong-hang |
Shougang Research Institute of Technology, Shougang Group, Beijing 100041, China |
|
|
Abstract A study on the production of low phosphorus steel by double slag operation in 210 t converter was carried out. A phosphorus content of less than 0. 005% (mass percent) was obtained before tapping. About 80% phosphorus could be removed by the first slag after 5 min. High Fe3+ content and high basicity in the first slag were in favor of dephosphorization. On the other hand, Fe3+ content had less effect on dephosphorization during second slag treatment. In the second slag period, the fraction of dephosphorization increased with the increase of basicity up to a basicity of 6. Further increase of basicity of the second slag had very little effect on dephosphorization. The tapping temperature had great impact on dephosphorization. It was impossible to get phosphorus less that 0. 005% when the tapping temperature was higher than 1 943 K. The optimum operation conditions were suggested. On the basis of these conditions, the amount of the second slag and the effect of the remaining first slag were estimated.
|
|
|
|
|
[1] |
Wei Wu,*,Shi-fan Dai,Yue Liu. Dephosphorization stability of hot metal by double slag operation in basic oxygen furnace[J]. Chinese Journal of Iron and Steel, 2017, 24(9): 908-915. |
[2] |
Yu-bao Liu,,Zhi-hong Zhang,,Er-xiong Zhao,,Xian-heng Zhang,,Xiao-qing Wang,, Guo-hua Chen,. Niobium and phosphorus behavior during melting-separation process of pre-reduced niobium ore concentrate[J]. Chinese Journal of Iron and Steel, 2017, 24(7): 691-696. |
[3] |
Dong��ping ZHAN,Yang��peng ZHANG,Zhou��hua JIANG,De��wei WANG,Hui��shu ZHANG. Chromium Recycling from Argon��oxygen Decarburization Dust in Hot Metal Pre��dephosphorization Process[J]. Chinese Journal of Iron and Steel, 2016, 23(9): 867-873. |
[4] |
Dong��bo HUANG,Yan��bing ZONG,Ru��fei WEI,Wei GAO,Xiao��ming LIU,. Direct Reduction of High��phosphorus Oolitic Hematite Ore Based on Biomass Pyrolysis[J]. Chinese Journal of Iron and Steel, 2016, 23(9): 874-883. |
[5] |
De-qing ZHU,Hao WANG,Jian PAN,Cong-cong YANG. Influence of Mechanical Activation on Acid Leaching Dephosphorization of High-phosphorus Iron Ore Concentrates[J]. Chinese Journal of Iron and Steel, 2016, 23(7): 661-668. |
[6] |
Wen-jie WU , Hui-xiang YU, Xin-hua WANG, Hai-bo LI , Ke LIU. Optimization on Bottom Blowing System of a 210 t Converter[J]. Chinese Journal of Iron and Steel, 2015, 22(Supplement 1): 80-86. |
|
|
|
|