Title
High carbon ferro-chromium production by self-reducing process: Effects of fe-si and fluxing agent additions
Date Issued
15 August 2011
Access level
open access
Resource Type
journal article
Author(s)
Takano C.
Mourao M.
Tagusagawa Y.
Iguchi Y.
Escola Politecnica of University of Sao Paulo
Abstract
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 selfreducing 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. © 2011 ISIJ.
Start page
1296
End page
1300
Volume
51
Issue
8
Language
English
OCDE Knowledge area
Ingeniería de sistemas y comunicaciones Ingeniería de materiales
Scopus EID
2-s2.0-80054056034
Source
ISIJ International
ISSN of the container
09151559
Sources of information: Directorio de Producción Científica Scopus