A method for modelling grate flow characteristics in autogenous and semi-autogenous grinding mills

D. Bordi, A. Heath, E. Pasternak

    Research output: Chapter in Book/Conference paperConference paper

    Abstract

    Since the early 1900’s Autogenous Grind (AG) and Semi-Autogenous Grind (SAG) mills have been an integral part of the grinding circuit in mineral processing plants. One of the major components of these mills is the discharge assembly, which typically includes a grate and pulp lifter. A mathematical model of grate flow has been developed from data obtained from a pilot scale mill.
    Measurements were made at a range of mill speeds, flow rates, charge levels and percentage open areas. Both the flow rate and hold-up in the mill were measured. The data was subsequently compared with literature grate flow models. These models were found to be inaccurate. A new model has been developed based on the summation of the flows through individual grate apertures, as determined by Bernoulli’s equation. In contrast to previously posed models, this equation does not contain power law fit terms and therefore its predictive capabilities are not restricted by the conditions of the data set. The grate flow was found to be determined primarily by the hydrostatic pressure and open area, with the mill speed and presence of rocks having minor effect.
    Original languageEnglish
    Title of host publication9th Australasian Congress on Applied Mechanics (ACAM9)
    Place of PublicationSydney
    PublisherEngineers Australia
    Pages62-69
    ISBN (Electronic)9781925627022
    Publication statusPublished - 2017
    Event9th Australasian Congress on Applied Mechanics - https://acam9.com.au/, Sydney, Australia
    Duration: 27 Nov 201729 Nov 2017

    Conference

    Conference9th Australasian Congress on Applied Mechanics
    Abbreviated titleACAM9
    CountryAustralia
    CitySydney
    Period27/11/1729/11/17

    Fingerprint

    flow modeling
    grinding
    mill
    mineral processing
    hydrostatic pressure
    method
    power law
    rock

    Cite this

    Bordi, D., Heath, A., & Pasternak, E. (2017). A method for modelling grate flow characteristics in autogenous and semi-autogenous grinding mills. In 9th Australasian Congress on Applied Mechanics (ACAM9) (pp. 62-69). Sydney: Engineers Australia.
    Bordi, D. ; Heath, A. ; Pasternak, E. / A method for modelling grate flow characteristics in autogenous and semi-autogenous grinding mills. 9th Australasian Congress on Applied Mechanics (ACAM9). Sydney : Engineers Australia, 2017. pp. 62-69
    @inproceedings{1f4e21c7d7a840e0a3e46421978eef29,
    title = "A method for modelling grate flow characteristics in autogenous and semi-autogenous grinding mills",
    abstract = "Since the early 1900’s Autogenous Grind (AG) and Semi-Autogenous Grind (SAG) mills have been an integral part of the grinding circuit in mineral processing plants. One of the major components of these mills is the discharge assembly, which typically includes a grate and pulp lifter. A mathematical model of grate flow has been developed from data obtained from a pilot scale mill.Measurements were made at a range of mill speeds, flow rates, charge levels and percentage open areas. Both the flow rate and hold-up in the mill were measured. The data was subsequently compared with literature grate flow models. These models were found to be inaccurate. A new model has been developed based on the summation of the flows through individual grate apertures, as determined by Bernoulli’s equation. In contrast to previously posed models, this equation does not contain power law fit terms and therefore its predictive capabilities are not restricted by the conditions of the data set. The grate flow was found to be determined primarily by the hydrostatic pressure and open area, with the mill speed and presence of rocks having minor effect.",
    author = "D. Bordi and A. Heath and E. Pasternak",
    year = "2017",
    language = "English",
    pages = "62--69",
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    Bordi, D, Heath, A & Pasternak, E 2017, A method for modelling grate flow characteristics in autogenous and semi-autogenous grinding mills. in 9th Australasian Congress on Applied Mechanics (ACAM9). Engineers Australia, Sydney, pp. 62-69, 9th Australasian Congress on Applied Mechanics , Sydney, Australia, 27/11/17.

    A method for modelling grate flow characteristics in autogenous and semi-autogenous grinding mills. / Bordi, D.; Heath, A.; Pasternak, E.

    9th Australasian Congress on Applied Mechanics (ACAM9). Sydney : Engineers Australia, 2017. p. 62-69.

    Research output: Chapter in Book/Conference paperConference paper

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    T1 - A method for modelling grate flow characteristics in autogenous and semi-autogenous grinding mills

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    AU - Heath, A.

    AU - Pasternak, E.

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    N2 - Since the early 1900’s Autogenous Grind (AG) and Semi-Autogenous Grind (SAG) mills have been an integral part of the grinding circuit in mineral processing plants. One of the major components of these mills is the discharge assembly, which typically includes a grate and pulp lifter. A mathematical model of grate flow has been developed from data obtained from a pilot scale mill.Measurements were made at a range of mill speeds, flow rates, charge levels and percentage open areas. Both the flow rate and hold-up in the mill were measured. The data was subsequently compared with literature grate flow models. These models were found to be inaccurate. A new model has been developed based on the summation of the flows through individual grate apertures, as determined by Bernoulli’s equation. In contrast to previously posed models, this equation does not contain power law fit terms and therefore its predictive capabilities are not restricted by the conditions of the data set. The grate flow was found to be determined primarily by the hydrostatic pressure and open area, with the mill speed and presence of rocks having minor effect.

    AB - Since the early 1900’s Autogenous Grind (AG) and Semi-Autogenous Grind (SAG) mills have been an integral part of the grinding circuit in mineral processing plants. One of the major components of these mills is the discharge assembly, which typically includes a grate and pulp lifter. A mathematical model of grate flow has been developed from data obtained from a pilot scale mill.Measurements were made at a range of mill speeds, flow rates, charge levels and percentage open areas. Both the flow rate and hold-up in the mill were measured. The data was subsequently compared with literature grate flow models. These models were found to be inaccurate. A new model has been developed based on the summation of the flows through individual grate apertures, as determined by Bernoulli’s equation. In contrast to previously posed models, this equation does not contain power law fit terms and therefore its predictive capabilities are not restricted by the conditions of the data set. The grate flow was found to be determined primarily by the hydrostatic pressure and open area, with the mill speed and presence of rocks having minor effect.

    M3 - Conference paper

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    EP - 69

    BT - 9th Australasian Congress on Applied Mechanics (ACAM9)

    PB - Engineers Australia

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    Bordi D, Heath A, Pasternak E. A method for modelling grate flow characteristics in autogenous and semi-autogenous grinding mills. In 9th Australasian Congress on Applied Mechanics (ACAM9). Sydney: Engineers Australia. 2017. p. 62-69