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Thread: Conveying of Salt

  1. #1
    Pål Gjerde Guest

    Conveying of salt

    Dear Sirs !

    Do anybody have any experience in conveying of salt, bulk weight 1,2. I am supposed to transport on top on a silo, 40 meter vertical, followed by 50 meter horizontal.
    May i use dilute/dense phase – or should I use elevator? Do salt petrify in bend and receiving silo?

    With best regards Pål G

  2. #2
    Dennis Hauch - Freeport, TX, USA Guest

    Salt Conveying

    P. Gjerde,

    The properties and conveying characteristics of salt are similar to those of sugar, with which I have quite some experience.

    Both dense-phase and dilute-phase designs can successfully convey salt per the configuration that you provided. Dense-phase does have the advantage of low-velocity conveyance, which will minimize degradation of the salt crystals. The conveying gas should be maintained at a low dew point (even minus 40 degrees) to exclude moisture. A conveying gas needing to be this dry is easier to manage with a closed-loop system design.

    Maintaining a dry conveying / storage atmosphere will keep the salt from coating the conveying pipes or caking in the silo.

    Kind regards,

    Dennis Hauch

  3. Hi Dennis,

    I was interested in your comments regarding dry air for pneumatic conveying. A dew point of -40 degrees represents a pretty low humidity gas. Is this normally used for sugar? I wonder could you explain why?

    My understanding in the case of salt (NaCl) is that the water adsorption isotherm is almost vertical at around 75 % relative humidity. I would have thought that a reasonable margin below that level would suffice to maintain good handling. Are there some other factors at play here?

    Regards,

    Peter

  4. #4

    salt conveying

    we have conveyed salt at 10 TPH over 75m to a silo in dilute phase for a large detergents manufacturer.

    please let us have your application details for us to suggest the parameters

    b.velan
    www.scorpioengg.com
    scorpioengg@vsnl.com

  5. #5
    Dennis Hauch - Freeport, TX, USA Guest

    Salt Handling

    Peter,

    In my experience it was necessary to handle the sugar in a dry and inert atmosphere for flowability and process reasons, respectively.

    Salt must be kept dry to keep it flowing. A small example, here on the Texas Gulf Coast you will find grains of rice in all the salt shakers in the restaurants, to keep the salt dry. Despite what the isobar says, over time free water can accumulate in the storage bin, on the side walls and in the bottom, especially if the bin is open to the atmosphere.

    A closed conveying / storage system is the first step. The second step is the provision of an atmosphere sufficiently dry that even over time the salt will remain dry and free-flowing.

    Regards,

    Dennis Hauch

  6. Conveying of salt

    In the similar case for a food salt we successfully
    used the FLEXOWELL pocket elevator ( white rubber)
    having vertical & horizontal sections.
    This is a very simple and reliable option for you.

    Michael Rivkin

  7. #7
    Serby Guest

    Salt Conveying

    We can offer you a pn. conveying system.
    Please send us your application details.

    Regards,
    Serby AG / Switzerland

    www.serby.com
    serby@bluewin.ch

  8. #8

    salt conveying

    Mechanical transport will take much less energy!
    For example bucket elevator 40 meters and belt conveyor 50 meters will take 15 kW together for 60 tons/hour.
    Estimated price excl. erection, ex works in pre assembled parts:
    elevator € 50.000 and belt conveyor € 35.000,-

    Jur Lommerts
    Jansen & Heuning Bulk Handling Systems
    The Netherlands
    www.jh.nl
    jfl@jh.nl
    tel: +31 50 3126 448

  9. Conveying of salt

    In addition to the large energy consumption, the
    pneumatic systems are much more "sensitive" to the
    quality of material and compressed air.
    I'd recommend the pneumatic systems in the case
    then there is something preventing using
    mechanical systems.
    Advantage of the FLEXOWELL consists in the fact
    that the elevator and the conveyor are one
    piece of equipment.

    Michael Rivkin

  10. #10
    Author Guest
    salt conveying

    Dr Rivkin is right about mechanical conveying advantages.
    However I prefere the cheaper classic mechanical conveying
    suggested by mr Lommegts.
    Anyhow before final decision please consider the layout & free
    available space.
    sincerly
    S.Bar


    __________________
    S. Bar
    Chief Engineer
    Ludan engineering LTD.

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