TY - GEN
T1 - Enhanced reduction of self-reducing pellet of chromites with Fe-Si addition in the reductant
AU - Zambrano, Adolfo Pillihuaman
AU - Takano, Cyro
AU - Mourao, Marcelo Breda
PY - 2008
Y1 - 2008
N2 - Fe-Cr-C production is a very high electrical energy consuming process. Decrease up to 10% of this electrical energy is expected when self-reducing agglomerates are used. This research aims to understand how the synergetic effects are when stronger reductant, like Fe-Si, is substituted for coke in self reducing pellets. Brazilian chromites containing 41.2%Cr2O 3 were mixed with petroleum coke and agglomerated with cement as the binder. Small amounts of 1%, 2% and 4% of Fe-75%Si were substituted for the equivalent petroleum coke, and pure silica plus hydrated lime were added for adjusting the slag composition. The mixture was pelletized, dried and submitted at 1773K up to complete the reactions. The results showed that the reduction reactions were 1.4 and 2 times faster with 1% and 2%Fe-Si addition, respectively, than with no addition. The microscopic analysis showed that it was formed a liquid phase, but the pellet did not collapse what indicates that the coalescence of the metallic phase depends on the dissolution of the pre-reduced particles of the chromites into slag.
AB - Fe-Cr-C production is a very high electrical energy consuming process. Decrease up to 10% of this electrical energy is expected when self-reducing agglomerates are used. This research aims to understand how the synergetic effects are when stronger reductant, like Fe-Si, is substituted for coke in self reducing pellets. Brazilian chromites containing 41.2%Cr2O 3 were mixed with petroleum coke and agglomerated with cement as the binder. Small amounts of 1%, 2% and 4% of Fe-75%Si were substituted for the equivalent petroleum coke, and pure silica plus hydrated lime were added for adjusting the slag composition. The mixture was pelletized, dried and submitted at 1773K up to complete the reactions. The results showed that the reduction reactions were 1.4 and 2 times faster with 1% and 2%Fe-Si addition, respectively, than with no addition. The microscopic analysis showed that it was formed a liquid phase, but the pellet did not collapse what indicates that the coalescence of the metallic phase depends on the dissolution of the pre-reduced particles of the chromites into slag.
KW - Chromites
KW - Ferro-chromium
KW - Self-reducing agglomerate
UR - http://www.scopus.com/inward/record.url?scp=52649139036&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:52649139036
SN - 9780873397155
T3 - TMS Annual Meeting
SP - 449
EP - 454
BT - Extraction and Processing Division - EPD Congress 2008 - Held during TMS 2008 Annual Meeting and Exhibition
T2 - Extraction and Processing Division - EPD Congress 2008 - Held during TMS 2008 Annual Meeting and Exhibition
Y2 - 9 March 2008 through 13 March 2008
ER -