Microstructure of Bentonite in Iron Ore Green Pellets

Mouzon, Johanne (author): Luleå tekniska universitet,Institutionen för samhällsbyggnad och naturresurser

Schröppel, Birgit (author): Natural and Medical Sciences Institute (NMI), University of Tübingen

Kaech, Andres (author): Center for Microscopy and Image Analysis, University of Zurich

Forsmo, Seija P.E. (author): LKAB, Research & Development, 983 81 Malmberget

Hedlund, Jonas (author): Luleå tekniska universitet,Institutionen för samhällsbyggnad och naturresurser

(creator_code:org_t)

2014
2014
English.
In: Microscopy and Microanalysis. - 1431-9276 .- 1435-8115. ; 20:1, s. 33-41

Related links:: https://urn.kb.se/re...; show more...; https://doi.org/10.1...; show less...

Abstract Subject headings

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.

By the author/editor: Bhuiyan, Iftekha ...; Mouzon, Johanne; Schröppel, Birgi ...; Kaech, Andres; Dobryden, Illia; Forsmo, Seija P. ...; show more...; Hedlund, Jonas; show less...

About the subject

ENGINEERING AND TECHNOLOGY: ENGINEERING AND ...; and Chemical Enginee ...; and Chemical Process ...

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Other Physics To ...

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