University of Oulu

Iljana M, Paananen T, Mattila O, Kondrakov M, Fabritius T. Effect of Iron Ore Pellet Size on Metallurgical Properties. Metals. 2022; 12(2):302.

Effect of iron ore pellet size on metallurgical properties

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Author: Iljana, Mikko1; Paananen, Timo2; Mattila, Olli2;
Organizations: 1Process Metallurgy Research Unit, University of Oulu, P.O. Box 4300, FI-90014 Oulu, Finland
2SSAB Europe Oy, P.O. Box 93, FI-92101 Raahe, Finland
3Karelsky Okatysh OAO, Severstal, 52 Zvezdnaya Street, RU-186930 Kostomuksha, Russia
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 5.8 MB)
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Language: English
Published: Multidisciplinary Digital Publishing Institute, 2022
Publish Date: 2022-05-16


Iron ore pellets are small and hard spherical particles agglomerated from a fine iron ore concentrate. They are used in the blast furnace process to produce hot metal. The diameter of blast furnace pellets is usually between 8 and 16 mm. In this study, a batch of magnesia iron ore pellets was first sieved into particle sizes of 8–10 mm, 10–12.7 mm, 12.7–16 mm and 16–20 mm, and the four different size fractions were used to study the effect of pellet size on metallurgical properties. The metallurgical experiments showed a decrease both in reducibility under unconstrained conditions and in low-temperature reduction-disintegration but showed an increase in cold crushing strength as the pellet size increased. In the reduction-softening test, pellets sized 10–12.7 mm reached the highest final temperature and the highest reduction degree among the pellet samples of different sizes. Based on the implications drawn from this study, the amount of 10–12.7 mm pellets should be maximized in a blast furnace operation.

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Series: Metals
ISSN: 2075-4701
ISSN-E: 2075-4701
ISSN-L: 2075-4701
Volume: 12
Issue: 2
Article number: 302
DOI: 10.3390/met12020302
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Funding: This research was funded by Business Finland as a part of the Towards Fossil-free Steel (FFS) research programme, grant number 45774/31/2020.
Copyright information: © 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (