Hyperactivation of Bentonite in Pelletizing Process


Department of Materials Engineering, Isfahan University of Technology, Iran


Application of hyperactivation process in palletizing iron ore, in order to decrease bentonite consumption has been investigated. Different amounts of bentonite and sodium hydroxide, as activating agents, were added to iron ore and the quality of formed pellets were determined. The results show that addition of 0.01 pct. NaOH improves the pellet quality significantly while the bentonite content remains constant at 0.7 pct. Moreover, pellet quality parameters were maintained within desired limit values while 0.02 pct NaOH and 0.4 pct bentonite were used. NaOH changes the chemistry of calcium-bentonite to sodium-bentonite that dispatches more easily in iron ore matrix. Homogeneous dispersion of bentonite in hyperactive mixtures creates uniform physical bonds between iron ore particles within pellet and results in less bentonite consumption


[1] M. Kurt ,Pelletizing Of Iron Ores, Springer-
Verlag, (1980), 53.
[2] N. Tohidi,V Ramez, V., Preparation of Iron
and Steel Burden, Tehran University,
[3] N. Tohidi, Production of Iron and Steel
Using DRI, Ahwaz Steel Co.,( 1990), 49.
[4] S. Sarhadi,An Investigation on Activation
and Optimization of Iranian Bentonites, J.
Rikhtegary, 5(1984),1.
[5] A. Swinburn, et all. Activation of Swelling
Clays, United state Patent No 6024790, (2000)
[6] Y. Nuray, Soda Activation of Bentonite from
KUTAHYA Region, Ph.D.Thesis, Ankara
University, (1997).
[7] R. Martin, Corus Co., Private