Effect of different factors on low temperature degradation of hematite iron ore during reduction
2014 (English)In: Metallurgical Research and Technology, ISSN 2271-3646, Vol. 111, no 1, 57-66 p.Article in journal (Refereed) Published
Low temperature degradation (LTD) of iron oxides was investigated with the aim of understanding how natural iron ores degrade under different conditions. Minimisation of this degradation would increase the acceptance level of natural iron ores as feed materials without prior beneficiation. In addition to temperature and reduction gas composition, sample positioning in the reduction furnace and sample's original weight were also found to influence LTD. Samples placed in the top reaction zone of the furnace, which have the first contact with the reducing gas, were found to degrade 1.5 times more than those in the middle and bottom reaction zones. In addition, they presented a wide range of size in the disintegrated particles than those in the middle and bottom reaction zones. Furthermore, the samples with an original weight equal to or greater than 5 g, had a disintegration extent of less than 10%. Therefore, if the reduction gas comes into contact with a certain material first, before contacting the iron oxide, it may serve to reduce on LTD during reduction. Furthermore, in laboratory conditions, the occurrence of low temperature breakdown of the natural iron oxides can be minimised by using samples with an original weight equal to or greater than 5 g.
Place, publisher, year, edition, pages
2014. Vol. 111, no 1, 57-66 p.
Hematite iron ore, reduction degree, low temperature strength, reaction zones, size of lumps
Other Materials Engineering
IdentifiersURN: urn:nbn:se:kth:diva-123060DOI: 10.1051/metal/2014014ISI: 000338512900008ScopusID: 2-s2.0-84904816193OAI: oai:DiVA.org:kth-123060DiVA: diva2:624393
ProjectsSustainable Technology Development in the Lake Victoria Region
FunderSida - Swedish International Development Cooperation Agency, 5410004501
QC 20130531. Updated from manuscript to article in journal.2013-05-312013-05-312014-08-12Bibliographically approved