Characterization of dust generated during mechanical wear of partially reduced iron ore pellets
(English)Manuscript (preprint) (Other academic)
During reduction in a blast furnace (BF), the iron ore pellets undergo structural changes which facilitate dust generation due to the mechanical wear / disintegration of the pellets. The generated dust decreases the permeability and productivity of the BF process. Thus, this study investigates the mechanical wear of iron ore pellets reduced at 500 °C (P500) and 850 °C (P850) and compares the results to the wear of unreduced pellets (P25). Moreover, the dust generated during the wear experiments is also characterized. It was found that pellets reduced at 500 °C exhibit a ~ 16 to 35% higher wear rate than reference unreduced pellets. For the pellets reduced at 850 °C, the mechanical wear is inhibited by a formation of a metallic layer at the outer surface of the pellets. Further, the dust generated due to mechanical wear of reduced pellets contained 3 to 6 times higher amount of coarse particles (>20µm) as compared to the dust from unreduced pellets. The obtained results are explained on the basis of the structural changes which take place during the reduction of pellets.
wear, pellets, dust, reduction, blast furnace
Metallurgy and Metallic Materials
Research subject Materials Science and Engineering
IdentifiersURN: urn:nbn:se:kth:diva-196927OAI: oai:DiVA.org:kth-196927DiVA: diva2:1049856
QC 201611292016-11-252016-11-252016-12-21Bibliographically approved