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NARROW SIZE FRACTIONS OBTAINED FROM ELECTRICALLY HEATED SCREEN DECKS
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Minerals and Metallurgical Engineering. (Mineralteknik)
LKAB. (Research and Development – Mineral Processing)
2019 (English)In: Conference in Minerals Engineering 2019 / [ed] Tommy Karlkvist, 2019Conference paper, Published paper (Refereed)
Abstract [en]

A probalistic screen with electrically heated decks has been used to produce narrow size fractions of magnetite and olivine below 1 mm. The results indicate that the major limiting production factor is the amount of too fine materials in the desired size fraction. This can be corrected by re-screening the narrow size fraction in various ways, but the best result is had with an air classifier.

The best way to evaluate the screening results is to plot the proportion of finished product, and the loss of the correct fraction as a function of feed rate and moisture content. These being quantity results, they need to be supplemented with quality parameters, and the best seem to be the weight percentage of too coarse (plus material) and too fine (minus material) particles in the finished product. There appears to be some threshold level for the heating effect, but to what extent this is related to the screen deck type, the heat capacity, and density of the material, or the particle size, is still unclear.

Place, publisher, year, edition, pages
2019.
Keywords [en]
magnetite, olivine, classification, screening, mass balancing, particle size
National Category
Chemical Process Engineering
Research subject
Mineral Processing
Identifiers
URN: urn:nbn:se:ltu:diva-77263OAI: oai:DiVA.org:ltu-77263DiVA, id: diva2:1381885
Conference
Conference in Minerals Engineering 2019
Available from: 2019-12-29 Created: 2019-12-29 Last updated: 2019-12-29

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Pålsson, Bertil

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