球团矿的还原膨胀行为及其机理的研究

REDUCTION SWELLING OF PELLETS AND ITS MECHANISM

In order to investigate the mechanism of the reduction swelling and disintegration of pellets,the morphology of metallic iron precipitated in the reduction process of pellets is analyzed by scanning electron microscope and kinetic calculation in this paper.It is found that the swelling behaviour has a close relation with the morphology and is influenced by the controlled step of reduction at Wustite stage and that the reduction at Wustite stage should be controlled by the key step of the diffusion of iron ion within a wider range of temperature to avoide catastrophic swelling and disintegration in reduction of pellets.