Development of a high-efficiency dephosphorization process via the fine in situ phases due to the composite ball explosion

ABSTRACT

In the present work, a new ladle dephosphorization process has been developed using the dispersed in situ phases induced by an explosive reaction of the composite balls with slag forming materials. A composite ball with this function has been designed and prepared using a laboratory model batch type balling disc (at 12 rev min⁻¹) and then has been fed during the convert tapping process. The results indicate that the explosion reaction of a composite ball at steelmaking temperature can take place and plenty of fine powders have been released. Feeding composite ball during converter tapping is a new process and the phosphorus in the molten steel can be removed effectively. Using this technique, the average dephosphorization rate is about 50% and the lowest phosphors in the molten steel can approach 40 ppm. Furthermore, there is no phosphorus reversion phenomenon occurred after the following procedures. Further study is recommended.

KEYWORDS:

• Dephosphorization
• calcium carbonate
• CO₂ fine bubble
• converter tapping
• composite ball
• explosition reaction
• in situ phases
• ladle

Disclosure statement

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

Additional information

Funding

This work was supported by Key Technologies R&D Program of Shaanxi Province [Grant Number 2020GY-109] and ANSTEEL for providing financial support which enabled this study to be successfully carried out.