著者
北村 信也 矢野 正孝 原島 和海 堤 直人
出版者
The Iron and Steel Institute of Japan
雑誌
鉄と鋼 (ISSN:00211575)
巻号頁・発行日
vol.80, no.3, pp.213-218, 1994-03-01 (Released:2009-06-19)
参考文献数
10
被引用文献数
25 25

A new decarburization model for the vacuum degasser was constructed. In this model, the mass transfer of carbon andoxygen in the liquid phase, the mass transfer of CO in the gas phase and the chemical reaction rate at the interface were taken into account for the rate controlling steps. Also, as the decarburization sites, the Ar bubble surface, bath surface, and the CO bubble formation at inner sites were considered. This model was verified by the correspondence of the calculation results with the experimental results of the small scale tests and applied to the various RH degassers. The following results were clarified :1) Decarburization at inner sites mainly occurs in the initial stage of the decarburization process (Stage I ), and decarburization at the bath surface becomes predominant in the final stage of the decarburization process (Stage II).2) The reaction in Stage I is mainly governed by the circulation rate and evacuation rate.3) The evacuation rate has a smaller influence on the reaction in Stage II. In this stage, it is essential to increase the circulation rate and to increase the effective reaction area for the decarburization at the bath surface by inducing violent surface agitation.
著者
井上 亮 有山 達郎 北村 信也 岡部 徹 山本 高郁
出版者
東北大学
雑誌
基盤研究(B)
巻号頁・発行日
2008

溶銑中V溶解度の温度依存性、高炉スラグ/溶銑間V分配比から、鉄鉱石中のVは炭化物を析出せずに溶銑に移行することがわかった。溶銑予備処理および転炉工程でV及びNbが含FeOスラグ中に取り込まれることを見出した。このスラグの冷却凝固過程でV はCalcium silicate相およびCaO-FeO-Al_2O_3相に、NbはCaO-FeO-Al_2O_3相に、PはCalcium silicate相にそれぞれ濃縮したことから、これらの鉱物相を分離することによって、高濃度のV、Nb、Pを含む鉱石代替品とすることが可能であった。