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Textural Variants of Iron Ore from Malmberget: Characterisation, Comminution and Mineral Liberation
Université de Liège.
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.
University of Liège.
2013 (English)In: Exploration, Resource & Mining Geology Conference 2013: Cardiff, United Kingdom, the 21 - 22 October / [ed] Claire Lockyer, Cardiff, Wales, UK: The Australian Institute of Mining and Metallurgy , 2013Conference paper, Published paper (Refereed)
Abstract [en]

The Geometallurgy combines geology and mineralogy, processing techniques and metallurgy into spatially-based predictive model and is useful tool that can be used in production management of a mineral processing plant. This work presents characterisation of different textural variants of the breccia iron ore from Malmberget, Northern Sweden, an iron mine operated by Luossavaara-Kiirunavaara Aktiebolag (LKAB). Experimental work includes point load tests, compressive tests, and laboratory grinding and liberation measurements of the products. The motivation of this work is based on the need of the industry to predict the throughput, particle size distribution, modal mineralogy, mineral textures and specific energy of the material.Around Magnetite orebodies, a wide range of feldspar-rich iron ore breccia has been described and classified by Lund, Lamberg (2013a) into eight different classes according to their feldspar content. The two end-members exhibit, respectively, a high iron grade (low feldspar content) and low iron grade (high feldspar content). A definition for the micro texture (micro fabrics) used in this study has been developed by Lund, Lamberg and Lindberg (2013b): two sample are texturally different if their modally refined liberation distribution is different in a given particle size. The hypothesis of the study is that it should be possible to quantitatively describe the textures of Malmberget feldspar type with two textural archetypes: high-graded massive and low-graded disseminated. The sample used were named after the earlier classification from CF1 (low iron grade) to CF8 (high iron grade) and compared per class. After simple rock mechanics tests, the second step involved comminution with a jaw crusher with 5 mm opening followed by 20 minutes in a ball mill with 1L of water for 1.2 kg of material. The 53 to 75 µm size fraction was selected for further characterisation and liberation analysis with x-ray fluorescence (XRF) and scanning electron microscope (SEM).The point load tests and compressive tests showed good agreement. When combined with specific gravity measurements, these properties allowed grouping of the eight classes into three clusters instead of the two end-members proposed initially. The jaw crusher and ball mill sieving curves further more supported this classification.The study with a SEM using INCA Mineral software and HSC Geo provided information on modal mineralogy, particles and degree of liberation in the 53 to 75 µm size fraction. Using these results, an association index (AI), describing how gangue minerals are associated with magnetite in the ore breccia, was calculated. Preliminary linear models predicting a relative work index for ball mill, the reduction ratio for jaw crusher and the degree of liberation of magnetite-based on modal mineralogy or mechanical properties were developed.While further work is required, this study shown the relevance and practical utility of the method used and indicates a relation between mechanical strength, iron ore grade, physical properties and textural information. The main hypothesis of two end-members had to be rejected and three classes were introduced instead, due to the large variability of breccia. Additional studies could include a higher number of samples, evaluate which mechanical tests are relevant in a context of geometallurgy, find a way to directly measure the AI and describe the effect of mixing different kinds of ore breccia before comminution in terms of particles, energy consumption and liberation

Place, publisher, year, edition, pages
Cardiff, Wales, UK: The Australian Institute of Mining and Metallurgy , 2013.
National Category
Metallurgy and Metallic Materials
Research subject
Mineral Processing
Identifiers
URN: urn:nbn:se:ltu:diva-32759Local ID: 7589fa85-c586-45cb-bee1-5bbcaff92bb2OAI: oai:DiVA.org:ltu-32759DiVA, id: diva2:1005993
Conference
Exploration, Resource & Mining Geology Conference : 21/10/2013 - 22/10/2013
Note
Godkänd; 2013; 20131025 (abdmwa)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved

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