Technological innovations of electric arc furnace bottom-blowing in China

Abstract

Nowadays, in China, the bottom-blowing technique plays an important role in accelerating the molten bath stirring and promoting the metallurgical reactions in electric arc furnace (EAF) steelmaking. The innovations of bottom-blowing technologies in EAF steelmaking were reviewed. The optimized bottom-blowing arrangement in EAF based on the furnace structure and the position of electrodes was introduced, and the fluid flow characteristics of EAF molten bath with bottom-blowing were analyzed. Furthermore, bottom-blowing CO2 in EAF can facilitate the carbon–oxygen reaction reaching equilibrium and decrease the content of nitrogen in molten steel due to its special metallurgical properties. Pulsating bottom-blowing in EAF can effectively improve the molten bath stirring through the action of the unsteady bottom-blowing gas streams, which could make the fluid flow field more disorderly than the steady bottom-blowing. And submerged O2 injection with CO2 in EAF can noticeably strengthen the EAF molten bath stirring, increase the production efficiency and improve the molten steel quality.

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Acknowledgements

The authors would like to express their thanks for the support by the National Natural Science Foundation of China (No. 51734003).

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Correspondence to Rong Zhu.

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Wei, G., Zhu, R., Wang, Y. et al. Technological innovations of electric arc furnace bottom-blowing in China. J. Iron Steel Res. Int. 26, 909–916 (2019). https://doi.org/10.1007/s42243-018-0163-7

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Keywords

  • Electric arc furnace
  • Bottom-blowing CO2
  • Pulsating bottom-blowing
  • EAF combined blowing technology
  • Submerged O2 injection with CO2