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Thread: Handling of cohesive sticky powder

  1. Handling of cohesive sticky powder

    Regarding the above mentioned topic, I got some questions and I would appreciate your help.

    If I would have a powder that has such a high cohesiveness and stickiness, so it wouldn’t even pass through a rotary valve or a screw conveyor of a bag filter, how will the possible measures look like in order to extract it from a filter? How can the transport over let’s say a length where a pneumatic transport is usually used? Pneumatic transport won’t work because of the stickiness. This material will simply stick and therefore block the pipe after time. Is there any known industry, which produces a powder with comparable powder characteristics with very bad handling properties?

    Thanks!

  2. #2
    thomaslamotte Guest
    Quote Originally Posted by sergejratzlaff View Post
    Regarding the above mentioned topic, I got some questions and I would appreciate your help.

    If I would have a powder that has such a high cohesiveness and stickiness, so it wouldn’t even pass through a rotary valve or a screw conveyor of a bag filter, how will the possible measures look like in order to extract it from a filter? How can the transport over let’s say a length where a pneumatic transport is usually used? Pneumatic transport won’t work because of the stickiness. This material will simply stick and therefore block the pipe after time. Is there any known industry, which produces a powder with comparable powder characteristics with very bad handling properties?

    Thanks!
    Dear Sergej,

    From what you describe, the situation is very difficult. The solution may not be in trying to find a process for this solid, but rather try to modify the properties of the solid in order to be able to process it. Few hints : use of a flowing agent, adjust the moisture, or even process a slurry.

    You may find some additional resources here : https://powderprocess.net/Pneumatic_..._Handbook.html
    https://powderprocess.net/Silo_discharge.html
    https://powderprocess.net/Solid_liquid_suspension.html

  3. Dealing with sticky materials

    I would refer you to a paper by Ajax Equipment on 'Dealing with wet and sticky materials'. A copy is available on application to sales@ajax.co.uk. Other comments may be made on submission of the application details. The first step is to measure the frictions and cohesive properties of a sample to establish basic design data. The report that it will not convey by screw presumably relates to standard screw geometry as 'Lynflow' profiled flights by Ajax are specifically designed to cope with bulk materials with awkward flow characteristics and the value of differing surface finishes may be verified by wall friction testing.

  4. #4

    Unhappy Chicken or Egg?

    It is fair to ask the question how do you propose to get it to the filter in the first place?
    Then you must differentiate between powders & cakes.
    There isn't much anybody could tell you about a hypothetical material which can or cannot be handled by the limited processes suggested.
    Evolution rules that the egg came before the chicken!
    John Gateley
    johngateley@hotmail.com
    www.the-credible-bulk.com

  5. #5

    Lightbulb non-free flowing products, fedder discharger conveyor for

    Quote Originally Posted by sergejratzlaff View Post
    Regarding the above mentioned topic, I got some questions and I would appreciate your help.

    If I would have a powder that has such a high cohesiveness and stickiness, so it wouldn’t even pass through a rotary valve or a screw conveyor of a bag filter, how will the possible measures look like in order to extract it from a filter? How can the transport over let’s say a length where a pneumatic transport is usually used? Pneumatic transport won’t work because of the stickiness. This material will simply stick and therefore block the pipe after time. Is there any known industry, which produces a powder with comparable powder characteristics with very bad handling properties?

    Thanks!
    Dear Sergej, I work with a company which are specialized in NON-FREE FLOWING DIFFICULT TO HANDLE BULK MATERIALS: sticky, cohesive, wet, very abrasive, very hot

    Please post your case here.
    Just to give you a first idea of a solutions I post pictures as example
    bulk-wtw_tkf-props_kl-cut2.jpg
    bulk_binex-external-drive.jpg
    bulk-wtweng_materials-equipment_plakat4-txt_60b.jpg
    dk
    bulk-good-solutions.com.ar
    5491145337982

  6. #6

    Angry Lost in the He That Knows.....

    It is surely time to knock this one on the head before more salesmen advertise their equipment without any knowledge of the thread starters intent.
    This thread asks about handling material which is purely imaginary & has also contradicted itself, despite its unknown properties. As Lord Kelvin taught over a century ago "We only know what we can measure."
    Without some quantitative information these forums are in danger of becoming purely an extension of the advertising sections of this website.
    This latest contribution advertises machinery similar to an original design named after Mrs Louise Dekker, aus Koln, just for the sake of advertising.

    "The solution may not be in trying to find a process for this solid, but rather try to modify the properties of the solid in order to be able to process it." Modifying the properties of a solid is perhaps an apt definition of processing that solid. Although that reply contradicts itself as well, it does illustrate the confusion generated by the original post.

    Typically, this thread starter has feigned to provide more information: probably because he didn't know what he was asking in the first place. I'm done with this one.
    John Gateley
    johngateley@hotmail.com
    www.the-credible-bulk.com

  7. #7

    children of Louise

    Quote Originally Posted by johngateley View Post
    It is surely time to knock this one on the head before more salesmen advertise their equipment without any knowledge of the thread starters intent.
    This thread asks about handling material which is purely imaginary & has also contradicted itself, despite its unknown properties. As Lord Kelvin taught over a century ago "We only know what we can measure."
    Without some quantitative information these forums are in danger of becoming purely an extension of the advertising sections of this website.
    This latest contribution advertises machinery similar to an original design named after Mrs Louise Dekker, aus Koln, just for the sake of advertising.

    "The solution may not be in trying to find a process for this solid, but rather try to modify the properties of the solid in order to be able to process it." Modifying the properties of a solid is perhaps an apt definition of processing that solid. Although that reply contradicts itself as well, it does illustrate the confusion generated by the original post.

    Typically, this thread starter has feigned to provide more information: probably because he didn't know what he was asking in the first place. I'm done with this one.
    Yes, you are right. The equipment I posted is from a company born after Louise closed.
    And Yes, it is a kind of advertisement, but pictures helps a lot (rule for SUDAM: no picture = no idea)
    So, Sergej never answered our questions about his case, so he does not know what he is asking for like your wrote.
    Nice to read you.
    dk
    bulk-good-solutions.com.ar
    5491145337982

  8. #8

    Smile

    Quote Originally Posted by bulk.good.solutions View Post
    ......The equipment I posted is from a company born after Louise closed.
    And Yes, it is a kind of advertisement, but pictures helps a lot (rule for SUDAM: no picture = no idea)
    ......
    Nice to read you.
    I agree, no picture=no idea. We often ask for pictures , but in vain.

    Welcome to the forums.
    John Gateley
    johngateley@hotmail.com
    www.the-credible-bulk.com

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