Heating and Melting of Metallized Wustite Pellet Immersed in Liquid Slag

摘要

In iron bath type smelting reduction heating and melting of iron oxide particles or agglomerate in liquid slag or metal medium is an important step. In the study heating and melting of metallized, porous wustite pellet with and without immersing in liquid slag were investigated in laboratory scale and the influence of conditions such as metallization ratio, pre-heating temperature of the pellet and slag temperature were examined. The internal structure of pellets immersed in slag was checked by means of optical microscope. In the work the X-ray image system and digital image analysis technique were adopted for monitoring and analyzing the shape variation of pellet immersed in liquid slag and meanwhile, the temperature was measured at the pellet center. As soon as a pellet is immersed in liquid slag a solid slag shell will form at the surface of the pellet and by image analysis this process was clearly figured out both graphically and quantitatively.