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Microstructure of Bentonite in Iron Ore Green Pellets
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Kemiteknik.
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser.ORCID-id: 0000-0003-4582-0902
Natural and Medical Sciences Institute (NMI), University of Tübingen.
Center for Microscopy and Image Analysis, University of Zurich.
Vise andre og tillknytning
2014 (engelsk)Inngår i: Microscopy and Microanalysis, ISSN 1431-9276, E-ISSN 1435-8115, Vol. 20, nr 1, s. 33-41Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Sodium-activated calcium bentonite is used as a binder in iron ore pellets and is known to increase strength of both wet and dry iron ore green pellets. In this article, the microstructure of bentonite in magnetite pellets is revealed for the first time using scanning electron microscopy. The microstructure of bentonite in wet and dry iron ore pellets, as well as in distilled water, was imaged by various imaging techniques (e.g., imaging at low voltage with monochromatic and decelerated beam or low loss backscattered electrons) and cryogenic methods (i.e., high pressure freezing and plunge freezing in liquid ethane). In wet iron ore green pellets, clay tactoids (stacks of parallel primary clay platelets) were very well dispersed and formed a voluminous network occupying the space available between mineral particles. When the pellet was dried, bentonite was drawn to the contact points between the particles and formed solid bridges, which impart strength to the solid compact.

sted, utgiver, år, opplag, sider
2014. Vol. 20, nr 1, s. 33-41
HSV kategori
Forskningsprogram
Kemisk teknologi; Experimentell fysik
Identifikatorer
URN: urn:nbn:se:ltu:diva-14558DOI: 10.1017/S1431927613013950ISI: 000335378400005PubMedID: 24397939Scopus ID: 2-s2.0-84896489107Lokal ID: def6ab2e-8caa-4fb6-ba9d-d97319ee464cOAI: oai:DiVA.org:ltu-14558DiVA, id: diva2:987531
Merknad
Validerad; 2014; 20140113 (andbra)Tilgjengelig fra: 2016-09-29 Laget: 2016-09-29 Sist oppdatert: 2018-07-10bibliografisk kontrollert

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