ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
Ironmaking
Influence of Agitating Conditions on Agglomeration and Collapse of Iron Ore Mixture
Takahide HiguchiKenta TakeharaToshiyuki HirosawaYuji IwamiTetsuya YamamotoHidetoshi MatsunoNobuyuki Oyama
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2018 Volume 58 Issue 11 Pages 2009-2017

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Abstract

The influence of agitating conditions on agglomeration and collapse of wet iron ore mixture was investigated in the view of kinetics and matrix model analysis. At the initial stage of mixing behavior, it was found that average particle size was dependent on the mixing rate constant defined as the deviation degree of particle size and water distribution from initial state. Mixing rate constants of powder and water were almost consistent with each other and expressed by power function of Froude number of impeller. It was presumed that the water and fine particle moved together as wet granules during mixing at a given water level. According to the analysis of entire mixing behavior based on matrix model, it was found that the collapse indexes defined by matrix parameters increased as particle size and impact force increased. Minimum particle size at initial mixing state decreased as collapse index increased and the size of long term mixing state was expected by intrinsic increasing rates defined by maximum eigenvalue of matrix parameters.

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© 2018 by The Iron and Steel Institute of Japan
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