Using electrically heated screen decks for producing narrow sub-millimetre fractions

Document identifier: oai:DiVA.org:ltu-77264
Keyword: Engineering and Technology, Chemical Engineering, Chemical Process Engineering, Teknik och teknologier, Kemiteknik, Kemiska processer, Magnetite, Olivine, Classification, Screening, Mass balancing, Particle size, Mineral Processing, Mineralteknik
Publication year: 2019
Relevant Sustainable Development Goals (SDGs):

The SDG label(s) above have been assigned by OSDG.ai

Abstract:

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 probalistic screen may be evaluated in the same way as a classifier with a cut point and sharpness of separation for each screen deck, and as a total for combinations of screen decks. However, 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 percentage of too coarse and too fine particles in the finished product.

Authors

Bertil Pålsson

Luleå tekniska universitet; Mineralteknik och metallurgi
Other publications >>

Johan Bucht

LKAB, Sweden
Other publications >>

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    header: 
        identifier: oai:DiVA.org:ltu-77264
        datestamp: 2021-05-12T23:06:04Z
        setSpec: SwePub-ltu
    metadata: 
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                version: 3.7
            recordInfo: 
                recordContentSource: ltu
                recordCreationDate: 2019-12-29
            identifier: http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-77264
            titleInfo: 
                @attributes: 
                    lang: eng
                title: Using electrically heated screen decks for producing narrow sub-millimetre fractions
            abstract: 
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 probalistic screen may be evaluated in the same way as a classifier with a cut point and sharpness of separation for each screen deck and as a total for combinations of screen decks. However 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 percentage of too coarse and too fine particles in the finished product.

            subject: 
                    @attributes: 
                        lang: eng
                        authority: uka.se
                    topic: 
                        Engineering and Technology
                        Chemical Engineering
                        Chemical Process Engineering
                    @attributes: 
                        lang: swe
                        authority: uka.se
                    topic: 
                        Teknik och teknologier
                        Kemiteknik
                        Kemiska processer
                    @attributes: 
                        lang: eng
                    topic: magnetite
                    @attributes: 
                        lang: eng
                    topic: olivine
                    @attributes: 
                        lang: eng
                    topic: classification
                    @attributes: 
                        lang: eng
                    topic: screening
                    @attributes: 
                        lang: eng
                    topic: mass balancing
                    @attributes: 
                        lang: eng
                    topic: particle size
                    @attributes: 
                        lang: eng
                        authority: ltu
                    topic: Mineral Processing
                    genre: Research subject
                    @attributes: 
                        lang: swe
                        authority: ltu
                    topic: Mineralteknik
                    genre: Research subject
            language: 
                languageTerm: eng
            genre: 
                conference/other
                ref
            note: 
                Published
                2
                
ISBN för värdpublikation:  978-1-5108-8870-8

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                    namePart: 
                        Pålsson
                        Bertil
                        1951-
                    role: 
                        roleTerm: aut
                    affiliation: 
                        Luleå tekniska universitet
                        Mineralteknik och metallurgi
                    nameIdentifier: 
                        palle
                        0000-0002-8032-9388
                    @attributes: 
                        type: personal
                    namePart: 
                        Bucht
                        Johan
                    role: 
                        roleTerm: aut
                    affiliation: LKAB Sweden
            originInfo: 
                dateIssued: 2019
                publisher: Minerals Engineering International (MEI)
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                titleInfo: 
                    title: Physical Separation '19
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                        start: 287
                        end: 304
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                form: print
            typeOfResource: text