High Carbon Ferro-chromium Production by Self-reducing Process: Effects of Fe-Si and Fluxing Agent Additions

被引:15
|
作者
Zambrano, Adolfo Pillihuaman [1 ]
Takano, Cyro [1 ]
Mourao, Marcelo Breda [1 ]
Tagusagawa, Yasuhiko Solon [1 ]
Iguchi, Yoshiaki [2 ]
机构
[1] Univ Sao Paulo, Met & Mat Engn Dept, Escola Politecn, BR-05508900 Sao Paulo, Brazil
[2] Nagoya Inst Technol, Showa Ku, Nagoya, Aichi 4668555, Japan
基金
巴西圣保罗研究基金会;
关键词
chromium ore; chromite; self-reducing agglomerate; pellet; ferro-chromium; COMPOSITE PELLETS; REDUCTION; CHROMITE; KINETICS; VACUUM;
D O I
10.2355/isijinternational.51.1296
中图分类号
TF [冶金工业];
学科分类号
0806 ;
摘要
The technology of self-reducing pellets for ferro-alloys production is becoming an emerging process due to the lower electric energy consumption and the improvement of metal recovery in comparison with the traditional process. This paper presents the effects of reduction temperature, addition of ferro-silicon and addition of slag forming agents for the production of high carbon ferro-chromium by utilization of self-reducing pellets. These pellets were composed of Brazilian chromium ore (chromite) concentrate, petroleum coke, Portland cement, ferro-silicon and slag forming components (silica and hydrated lime). The pellets were processed at 1 773 K, 1 823 K and 1 873 K using an induction furnace. The products obtained, containing slag and metallic phases, were analyzed by scanning electron microscopy and chemical analyses (XEDS). A large effect on the reduction time was observed by increasing the temperature from 1 773 K to 1 823 K for pellets without Fe-Si addition: around 4 times faster at 1 823 K than at 1 773 K for reaction fraction close to one. However, when the temperature was further increased from 1 823 K to 1 873 K the kinetics improved by double. At 1 773 K, the addition of 2% of ferro-silicon in the pellet resulted in an increasing reaction rate of around 6 times, in comparison with agglomerate without it. The addition of fluxing agents (silica and lime), which form initial slag before the reduction is completed, impaired the full reduction. These pellets became less porous after the reduction process.
引用
收藏
页码:1296 / 1300
页数:5
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