Abstract
Investigation was conducted on roasting properties of pellets with an iron concentrate of complex mineral composition. The results indicated that the pellets of complex mineral composition concentrate required higher preheating temperature and longer preheating time than that of single magnetite concentrate. Therefore, it is difficult for preheated pellets to withstand the mechanical collision in the roasting process in rotary kiln. It was found that after the iron concentrate being subjected to high pressure roll grinding, the specific surface area reached 2029. 1 cm2/g. Consequently, the preheating and roasting temperature of pellets were decreased by 70 and 50 C and preheating and roasting time were decreased by 2 and 4 min, respectively. Meanwhile, the compression strength of preheated and roasted pellets were increased by 200 N for a pellet and 220 N for a pellet, respectively. The mechanism lied in that the increase of specific surface area activated thermal reaction and promoted formation of inter-grain bridge.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
ZHU De-qin, TANG Yan-yun, Vinicius Mendes, et al. Pre-treatment of Brazilian Spéculante Before Pelletization by High Pressure Roller Grinding [J]. Metal Mine, 2008(4): 10 (in Chinese).
ZHU De-qin, PAN Jian, QIU Guan-zhou, et al. Mechano-Chemical Activation of Magnetite Concentrate for Improving Its Pelletability by High Pressure Roll Grinding [J]. ISIJ International, 2004, 44(2): 310.
WANG Chang-an, XIONG Shou-an, ZHU De-qin. Effect of High Pressure Roller Mill Pre-Treatment Concentrates on Green Ball Property [J]. Sintering and Pelletizing, 2002, 27(6): 12.
QIU Zhuan-zhou, ZHU De-qin, PAN Jian, et al. Improve the Oxidizing Kinetics of Pelletization of Magnetite Concentrate by High Press Roll Grinding [J]. ISIJ International, 2004, 44(1): 69.
LIU Shu, WANG Yong-qing. The Application of HPRG (RP3. 6-120/50B) at Chengchao Pellet Plant [J]. Pellet Technology, 2006(1): 38 (in Chinese).
WU Wen-he, SHU Fang-hua. The Application of Brazil Hematite at 500 mt/a Pellet Plant [J]. Pellet Technology, 2008(4): 18 (in Chinese).
ZHAO Yan-hu, WU Rui-hua, ZHANG Hua-ming. The Production Practice of 2 Mt Pellet Plant [J]. HanDan Steels Technology, 2008(2): 21 (in Chinese).
REN De-shu. Principle of Particle Group Crushing and Application of Roll Press [J]. Metal Mine, 2002(12): 10 (in Chinese).
FU Ju-yin, ZHU De-qing. Process and Equipment of Iron Ore Pellet Production [M]. Changsha: Central South University Press, 2005 (in Chinese).
XIAO Qi. The Theory and Production of Pellet [M]. Chang-sha: Central South University of Technology Press, 1990 (in Chinese).
Author information
Authors and Affiliations
Corresponding author
Additional information
Foundation Item: Item Sponsored by National Natural Science Foundation of China (50725116)
Rights and permissions
About this article
Cite this article
Fan, Jj., Qiu, Gz., Jiang, T. et al. Roasting Properties of Pellets With Iron Concentrate of Complex Mineral Composition. J. Iron Steel Res. Int. 18, 1–7 (2011). https://doi.org/10.1016/S1006-706X(11)60082-4
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1016/S1006-706X(11)60082-4