Results 1 to 4 of 4

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

Similar Threads

  1. Handling of cohesive sticky powder
    By sergejratzlaff in forum Mechanical Conveying
    Replies: 5
    Last Post: 11th May 2018, 19:10
  2. Handling of cohesive sticky powder
    By sergejratzlaff in forum Mechanical Conveying
    Replies: 0
    Last Post: 12th February 2018, 20:14
  3. Cohesive Material for Testing
    By jag_minhas - Guttridge Ltd, U.K. in forum Ask Lyn Forum
    Replies: 5
    Last Post: 13th January 2011, 10:21
  4. Pneumatic Transport of Cohesive Powder
    By c_gargiulo in forum Pneumatic Conveying
    Replies: 4
    Last Post: 2nd February 2008, 5:26
  5. Transport of Cohesive PVC Powder
    By bbd in forum Pneumatic Conveying
    Replies: 6
    Last Post: 10th September 2003, 15:23

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Single Sign On provided by vBSSO