Liquid penetration rate into submerged porous particles: Theory, experimental validation and implications for iron ore granulation and sintering

S. M. Iveson, K. F. Rutherford, S. R. Biggs

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    15 Citations (Scopus)

    Abstract

    A two-stage model has been developed to describe the penetration of liquid into a submerged porous particle. In the first stage liquid flow is driven by capillary pressure and resisted by viscous losses and the pressure of the air trapped inside the pores. This initial flow ceases when the trapped air pressure equals the capillary pressure. In the second stage the pressurized air slowly dissolves and diffuses through the pore liquid into the bulk fluid; this continues until all the air has dissolved. Novel but simple experiments were performed to measure directly the time required for liquid to soak into porous iron ore particles. The trends of the measured penetration times supported the predictions of the model. Quantitatively, however, the model underpredicted the penetration times. This is probably due to the heterogeneous nature of the pore networks in the iron ore particles, which are poorly described by a single, average pore diameter. The results show that the time taken for iron ore particles to saturate with liquid can be of the order of hours-much longer than the typical residence time during drum granulation in sinter plants. This provides a plausible explanation of why some pre-wetted ores require a higher total mixture moisture content to agglomerate satisfactorily than partially dried ores.

    Original languageEnglish
    JournalTransactions of the Institutions of Mining and Metallurgy, Section C: Mineral Processing and Extractive Metallurgy
    Volume110
    Issue numberSEP./DEC.
    Publication statusPublished - 1 Sep 2001

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    Granulation
    Iron ores
    iron ore
    Sintering
    penetration
    liquid
    Liquids
    Capillarity
    capillary pressure
    Air
    Ores
    air
    sinter
    atmospheric pressure
    residence time
    moisture content
    Moisture
    sintering
    particle
    rate

    Cite this

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    title = "Liquid penetration rate into submerged porous particles: Theory, experimental validation and implications for iron ore granulation and sintering",
    abstract = "A two-stage model has been developed to describe the penetration of liquid into a submerged porous particle. In the first stage liquid flow is driven by capillary pressure and resisted by viscous losses and the pressure of the air trapped inside the pores. This initial flow ceases when the trapped air pressure equals the capillary pressure. In the second stage the pressurized air slowly dissolves and diffuses through the pore liquid into the bulk fluid; this continues until all the air has dissolved. Novel but simple experiments were performed to measure directly the time required for liquid to soak into porous iron ore particles. The trends of the measured penetration times supported the predictions of the model. Quantitatively, however, the model underpredicted the penetration times. This is probably due to the heterogeneous nature of the pore networks in the iron ore particles, which are poorly described by a single, average pore diameter. The results show that the time taken for iron ore particles to saturate with liquid can be of the order of hours-much longer than the typical residence time during drum granulation in sinter plants. This provides a plausible explanation of why some pre-wetted ores require a higher total mixture moisture content to agglomerate satisfactorily than partially dried ores.",
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    year = "2001",
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    TY - JOUR

    T1 - Liquid penetration rate into submerged porous particles

    T2 - Theory, experimental validation and implications for iron ore granulation and sintering

    AU - Iveson, S. M.

    AU - Rutherford, K. F.

    AU - Biggs, S. R.

    PY - 2001/9/1

    Y1 - 2001/9/1

    N2 - A two-stage model has been developed to describe the penetration of liquid into a submerged porous particle. In the first stage liquid flow is driven by capillary pressure and resisted by viscous losses and the pressure of the air trapped inside the pores. This initial flow ceases when the trapped air pressure equals the capillary pressure. In the second stage the pressurized air slowly dissolves and diffuses through the pore liquid into the bulk fluid; this continues until all the air has dissolved. Novel but simple experiments were performed to measure directly the time required for liquid to soak into porous iron ore particles. The trends of the measured penetration times supported the predictions of the model. Quantitatively, however, the model underpredicted the penetration times. This is probably due to the heterogeneous nature of the pore networks in the iron ore particles, which are poorly described by a single, average pore diameter. The results show that the time taken for iron ore particles to saturate with liquid can be of the order of hours-much longer than the typical residence time during drum granulation in sinter plants. This provides a plausible explanation of why some pre-wetted ores require a higher total mixture moisture content to agglomerate satisfactorily than partially dried ores.

    AB - A two-stage model has been developed to describe the penetration of liquid into a submerged porous particle. In the first stage liquid flow is driven by capillary pressure and resisted by viscous losses and the pressure of the air trapped inside the pores. This initial flow ceases when the trapped air pressure equals the capillary pressure. In the second stage the pressurized air slowly dissolves and diffuses through the pore liquid into the bulk fluid; this continues until all the air has dissolved. Novel but simple experiments were performed to measure directly the time required for liquid to soak into porous iron ore particles. The trends of the measured penetration times supported the predictions of the model. Quantitatively, however, the model underpredicted the penetration times. This is probably due to the heterogeneous nature of the pore networks in the iron ore particles, which are poorly described by a single, average pore diameter. The results show that the time taken for iron ore particles to saturate with liquid can be of the order of hours-much longer than the typical residence time during drum granulation in sinter plants. This provides a plausible explanation of why some pre-wetted ores require a higher total mixture moisture content to agglomerate satisfactorily than partially dried ores.

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    VL - 110

    JO - Transactions of the Institutions of Mining and Metallurgy, Section C: Mineral Processing and Extractive Metallurgy

    JF - Transactions of the Institutions of Mining and Metallurgy, Section C: Mineral Processing and Extractive Metallurgy

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