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Influence of alumina on iron-silicate slag properties
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.ORCID iD: 0000-0003-1511-8020
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
2011 (English)In: Proceedings of European Metallurgical Conference EMC 2011: Copper, General Pyrometallurgy/ Vessel Integrity/ Process Gas Treatment, Germany: GDMB , 2011, Vol. 1, p. 291-305Conference paper, Published paper (Refereed)
Abstract [en]

Application of electronic scraps as secondary raw materials in non-ferrous metal extraction intro-duces various impurities to the production furnaces. This may change the chemical composition, and thereafter, the physical and chemical properties of products and by-products of the metallurgi-cal operation. Alumina is one of the most common and significant compounds that is associated with most of the secondary raw materials. Balancing the recycling advantages and possible adverse effects of the increased alumina content in the process is of much interest to the metals producers. In this paper, effects of alumina on melting and leaching behaviors of an industrial iron-silicate (fayalite-type) slag, from a Swedish copper producer, are studied. A reference slag sample, devoid of alumina addition, and three different mixtures of slag with 5, 10, and 15 wt-% alumina addition were prepared. After homogenization (re-melting) of the mixtures, in an induction furnace, the ma-terials were characterized using scanning electron microscopy (SEM) and X-ray diffraction (XRD). A standard single stage leaching test was used to study the leaching behavior of the samples. Dif-ferential scanning calorimetry (DSC), using Pt-Rh crucibles, was applied to investigate the melting and solidification properties of the mixtures. Results show that, this slag has an alumina saturation limit between 5 and 10 wt-% alumina additions. Chemical composition of the major phases does not change above the saturation and excess amount of aluminum is consumed for formation of a new aluminum containing phase, anorthite. Alumina addition increases the melting temperature continu-ously, while the rate of increase changes. Alumina contents close to the saturation limit of the slag decrease the leachability considerably.

Place, publisher, year, edition, pages
Germany: GDMB , 2011. Vol. 1, p. 291-305
National Category
Metallurgy and Metallic Materials
Research subject
Process Metallurgy
Identifiers
URN: urn:nbn:se:ltu:diva-37350Local ID: b58fead4-c520-4dee-9aec-341ed126db7dISBN: 978-3-940276-36-0 (print)OAI: oai:DiVA.org:ltu-37350DiVA, id: diva2:1010848
Conference
European Metallurgical Conference : 26/06/2011 - 29/06/2011
Note
Godkänd; 2011; Bibliografisk uppgift: Die Deutsche Bibliothek lists this publication in the Deutsche Nationalbibliographie, detailed bibliographic data is available in the internet at http://dnb.ddb.de; 20110629 (sinmos)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2018-01-19Bibliographically approved

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Mostaghel, SinaSamuelsson, CaisaBjörkman, Bo

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