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Rare earth mineralogy in tailings from Kiirunavaara iron ore, northern Sweden: Implications for mineral processing
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geovetenskap och miljöteknik.ORCID-id: 0000-0003-4711-7671
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Mineralteknik och metallurgi.ORCID-id: 0000-0002-8032-9388
Luleå tekniska universitet, Institutionen för samhällsbyggnad och naturresurser, Geovetenskap och miljöteknik.ORCID-id: 0000-0002-0935-3430
Finland Isotope Geosciences Laboratory, Geological Survey of Finland, Espoo.
2017 (engelsk)Inngår i: Minerals & metallurgical processing, ISSN 0747-9182, Vol. 34, nr 4, s. 189-200Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Four main and three minor rare-earth-element (REE)-bearing minerals were identified and quantified in the Kiirunavaara apatite iron ore tailings using optical microscopy, an electron probe microanalyzer (EPMA) and a mineral liberation analyzer, and their chemical compositions were analyzed by the EPMA and laser ablation inductively coupled plasmamass spectrometry. REEs are shown to be contained in the minerals apatite, monazite, allanite, titanite, zircon, thorite and synchysite. In zircon, thorite and synchysite, they occurred in only trace amounts and contributed limited amounts to the total REE budget, and these are consequently of minor importance. Monazite occurred as inclusions in apatite and as free particles, 90 percent liberated. Allanite occurred to some degree in mixed grains with magnetite but also as free particles. Monazite mainly reported to the apatite concentrate, while allanite and titanite largely went to the tailings, the latter preferably to those fractions smaller than 38 μm. The amount of titanite in the finest tailings fraction was 2.3 weight percent, containing close to 1 percent REEs, with heavy rare earth elements (HREEs) making up 28 percent of the total REEs. However, a texturally distinct group of titanite grains showed an HREE/REE ratio of up to 67 percent. Furthermore, titanum dioxide analyses indicate that titanite is preferentially released into the tailings from the secondary magnetic separation step in the concentrator. Our data therefore suggest that titanite, occasionally enriched in HREEs, can be extracted from the processing stream and might thus be considered a new source for REEs at Kiirunavaara and similar deposits.

sted, utgiver, år, opplag, sider
Society for Mining, Metallurgy and Exploration , 2017. Vol. 34, nr 4, s. 189-200
HSV kategori
Forskningsprogram
Malmgeologi; Mineralteknik
Identifikatorer
URN: urn:nbn:se:ltu:diva-66621DOI: 10.19150/mmp.7859ISI: 000419794200005Scopus ID: 2-s2.0-85032955143OAI: oai:DiVA.org:ltu-66621DiVA, id: diva2:1158027
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Validerad;2017;Nivå 2;2017-11-17 (andbra)

Tilgjengelig fra: 2017-11-17 Laget: 2017-11-17 Sist oppdatert: 2018-03-26bibliografisk kontrollert

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Wanhainen, ChristinaPålsson, BertilMartinsson, Olof

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