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| Effect of bottom blowing on dephosphorization technology in combined blowing converter |
| ZENG Jia-qing，YANG Li-bin，WANG Jie，LIU Xiao-liang，YAO Tong-lu，DAI Shi-fan |
| （Metallurgical?Technology?Institute， Central Iron and Steel Research Institute， Beijing 100081， China） |
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Abstract Reasonable dephosphorization mechanism and opportunity were proposed through discussion of dephosphorization trend and drawbacks of conventional dephosphorization in the current study. On the basis of thermodynamics and dynamic analysis on dephosphorization in BOF， it showed that bottom blowing was the main dynamics means to improve dephosphorization efficiency， which could balance the stir of slag-steel interface and dephosphorization temperature control. The study results of slag mass transfer simulation showed that there was a suitable matching relationship between the bottom blowing element number and bottom blowing intensity. With the bottom blowing intensity increased， the number of bottom blowing element should be increased. Long life combined with blowing effects depended not only on rational selection， number， layout of elements and supply patterns， but also on scientific bottom blowing maintenance technology.
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Received: 29 September 2016
Published: 09 June 2017
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2017, Vol. 52 
