TY - JOUR
T1 - Effects of gangue compositions on reduction process of carbon-bearing iron ore pellets
AU - Meng, Qing-min
AU - Li, Jia-xin
AU - Wei, Ru-fei
AU - Long, Hong-ming
AU - Chun, Tie-jun
AU - Wang, Ping
AU - Di, Zhan-xia
AU - Dessbesell, Luana
AU - Xu, Chunbao
N1 - Funding Information:
Acknowledgements The authors would like to acknowledge the funding from the National Natural Science Foundation of China (Grant Nos. 51574002 and 51404005), the Natural Sciences and Engineering Research Council of Canada (NSERC) and Science without borders/CNPq (L. Dessbesell).
Publisher Copyright:
© 2018, China Iron and Steel Research Institute Group.
PY - 2018/11/1
Y1 - 2018/11/1
N2 - The influence of gangue compositions (mainly composed of SiO2, CaO, MgO and Al2O3) on the reduction kinetics of carbon-bearing iron ore pellets was estimated at 1373–1473 K in N2 atmosphere. The results showed that gangue content and each component distribution affected the pellets reduction process. The reduction rate was found to follow a linear correlation with quaternary basicity R4 [mass ratio of (CaO + MgO) to (SiO2 + Al2O3)] of the carbon-bearing iron ore pellets; also, the content of SiO2 solid solution in iron oxide had a significant impact on the reduction rate. At the same reduction temperature, a higher R4 resulted in a lower SiO2 free content, weakening its inhibitory effect on the Boudouard reaction. The reduction temperature of Fe2SiO4 could be reduced by increasing the contents of CaO and MgO, improving the iron oxide reduction as well as the precipitation and growth of the iron grains. The gangue content and component distribution showed no effect on the rate-controlling step of the reduction; however, the apparent activation energy of reaction decreased with increasing quaternary basicity. When R4 increased from 0.15 to 0.67, the apparent activation energy decreased from 228.51 to 193.66 kJ/mol.
AB - The influence of gangue compositions (mainly composed of SiO2, CaO, MgO and Al2O3) on the reduction kinetics of carbon-bearing iron ore pellets was estimated at 1373–1473 K in N2 atmosphere. The results showed that gangue content and each component distribution affected the pellets reduction process. The reduction rate was found to follow a linear correlation with quaternary basicity R4 [mass ratio of (CaO + MgO) to (SiO2 + Al2O3)] of the carbon-bearing iron ore pellets; also, the content of SiO2 solid solution in iron oxide had a significant impact on the reduction rate. At the same reduction temperature, a higher R4 resulted in a lower SiO2 free content, weakening its inhibitory effect on the Boudouard reaction. The reduction temperature of Fe2SiO4 could be reduced by increasing the contents of CaO and MgO, improving the iron oxide reduction as well as the precipitation and growth of the iron grains. The gangue content and component distribution showed no effect on the rate-controlling step of the reduction; however, the apparent activation energy of reaction decreased with increasing quaternary basicity. When R4 increased from 0.15 to 0.67, the apparent activation energy decreased from 228.51 to 193.66 kJ/mol.
KW - Apparent activation energy
KW - Carbon-bearing iron ore pellet
KW - Gangue composition
KW - Quaternary basicity
KW - Reduction kinetics
UR - http://www.scopus.com/inward/record.url?scp=85057839205&partnerID=8YFLogxK
U2 - 10.1007/s42243-018-0168-2
DO - 10.1007/s42243-018-0168-2
M3 - Article
AN - SCOPUS:85057839205
SN - 1006-706X
VL - 25
SP - 1105
EP - 1112
JO - Journal of Iron and Steel Research International
JF - Journal of Iron and Steel Research International
IS - 11
ER -