Study on metallurgical characteristics of the bottom-blown O₂–CaO converter

ABSTRACT

In this paper, the industrial experiment of bottom-blowing O₂–CaO was carried out by using a mixed injection of multi-gas medium to reduce the erosion of bottom-blown components and improve the life of the converter. The mechanism of slagging and dephosphorization during the process of bottom-blowing O₂–CaO was deeply studied, a better way of slag making by blowing CaO powder from the bottom of the converter was described in detail, and the corresponding model of slag-forming was established. The research illustrates that the dephosphorization reaction in the bottom-blown O₂–CaO process is a ‘transient reaction’, and a comprehensive model of dephosphorization process was established. On the basis of experimental data, it is found that [%C]·(%FeO) and [%C]·[%O] are linearly related to [%C] respectively, meanwhile, their relationship equations were obtained by the fitting method and shown in the paper.

KEYWORDS:

• Converter
• steelmaking process‌
• bottom-blown O₂–CaO process
• slag-forming model
• dephosphorization process
• carbon content
• ferrous oxide content
• carbon–oxygen reaction

Acknowledgements

The authors would like to extend their sincere gratitude to those who provided help and assistance.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This research was financially supported by the National Natural Science Foundation of China [grant numbers 5160040844 and 51674021].