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Influence of charge type on measurements with an in-mill sensor
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: 0000-0002-8032-9388
LKAB, Research & Development, 983 81 Malmberget.
2012 (English)In: Minerals Engineering, ISSN 0892-6875, E-ISSN 1872-9444, Vol. 39, p. 262-267Article in journal (Refereed) Published
Abstract [en]

The process of grinding is complex with many factors affecting the result. As the composition of the ore fed to the concentrator varies, implying changes in grindability, the optimal operation conditions for a pebble mill will also vary. In an attempt to increase the understanding of charge dynamics, a series of statistically planned experiments were done in a pilot-scale pebble mill with differing charge types. This pebble mill is equipped with an in-mill sensor, which measures the deflection of a single lifter as it passes through the mill charge. The experimental setup was a factorial design with two factors; two levels of magnetite pebbles content and three different size distributions. The experiments show that there is an advantage to keep the magnetite pebbles proportion as high as possible. This will increase the power consumption and maximum deflection of the lifters, but at the same time increase the production of <45 μm material, the grindability and the pebbles consumption. A pebble size fraction 10–35 mm improves the grindability the most and the amount of <45 μm material. It is strongly suggested that the 10–35 mm and 100% magnetite pebbles fraction should be tested in a larger scale pebble mill to confirm these findings.

Place, publisher, year, edition, pages
2012. Vol. 39, p. 262-267
National Category
Metallurgy and Metallic Materials
Research subject
Mineral Processing
Identifiers
URN: urn:nbn:se:ltu:diva-11939DOI: 10.1016/j.mineng.2012.07.009ISI: 000312119600034Scopus ID: 2-s2.0-84867091297Local ID: afb61def-fef6-4dd7-9172-ed38bc43650dOAI: oai:DiVA.org:ltu-11939DiVA, id: diva2:984889
Note
Validerad; 2012; 20121009 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Alatalo, JohannaPålsson, Bertil

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