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Thread: Conveying TiO2

  1. #1
    Join Date
    Dec 02
    Posts
    11

    conveying TiO2

    Can TiO2 be sucessfully conveyed pneumatically and if so what's involved in making the system work.
    Thanks in advance
    Allen L. Powell

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

    Ti02

    Allen,

    Yes, Ti02 is a good application for pneumatic handling.

    The are two areas that are key to its success 1) entraining it in the airstream and 2) separating it from the airstream.

    Allowing for the material and without knowledge of the thruput or the distance, a vacuum system would offer clear advantages over a pressure system.

    Regards,

    Dennis Hauch

  3. #3
    Matt Scholl Guest
    TiO2 is very difficult to pneumatically convey, it builds up in elbows. You need very high convey velocities and may want to use flexible hose for your elbows.

  4. #4
    Ken Tuckey Guest

    Pnuematic conveying of TiO2

    Hi Allen,

    the material has been pneumatically conveyed and we have been involved in 2 applications in the Richards Bay area of South Africa. Whilst we're not involved in the pneumatics, we've been called in because the wear, especially on the bends, is DRAMATIC. We are working on a solution using Al2O3 {dense alumina wear resistant ceramic} together with the likes of Clyde Bergemann Company.

    our website www.multotec.co.za & the other guys www.clydematerials.com

    We also are involved with several other South African companies including VACAIR & Bateman Engineered Technologies who also do pneumatics conveyancing, similarly we do the wear resistance they do the transport.

    regards & luck,

    Ken

  5. #5
    Nick Hayes Guest

    Ti O2 conveying

    Use an Aero-Mechanical Conveyor. No filters and the cable and disc assembly prevents build up in the tubes. Pneumatic Conveying does not work well primarily because of filtrationa nd build up issues. Flexible and Rigid Augers suffer from the same build up problems.

  6. #6
    kgifford Guest

    Conveying TiO2

    Allen,

    Conforma Clad currently provides tungsten carbide protected elbows and reducers to a number of companies that mine and process titanium dioxide.

    If you'd like more information, please don't hesitate to send me a return e-mail.

    Regards,

    Keith Gifford

  7. #7
    Join Date
    Dec 02
    Posts
    11

    Conveying TiO2

    We're looking at a vacuum system to transfer 5000 to 15000 lbs/Hr. Conveying distance is approximately 60' horizontal and 20' vertical with 3 90 deg bends. What sort of pick up velocity would you use and would flex hose at the turns minimize build up?

    Thanks in advance for the info.
    Al Powell
    Allen L. Powell

  8. Allen,

    Some researchers think the pick up velocity is a function of Froude number (It is a debatable issue). But in any case from my personal experience I have found the pick up velocity to be the function of pipe diameter and it increases with the increase in pipe diameter.
    Mantoo

  9. #9
    WHWilson Guest
    Allen --

    Hopefully someone has steered you away from this application since your last post. I would prefer not to give you a velocity recommendation since we avoid conveying TiO2 if at all possible. We have had success in limited use applications, and in applications where we are conveying other materials in the same convey line after the TiO2 has been transported.

    "IF" I were to tackle this application, I would use a vacuum system with some type of feed device at the pickup point to meter the material into the line (NO rotary feeders -- TiO2 loves to seize anything with a close tolerance that moves). I would oversize the conveying line and pump for the desired rate, to compensate for some amount of buildup in the line. I would also attempt to maintain the conveying velocity as low as possible in order to minimize wear at the ells.

    Yes, I would use hose bends, taking into account the added resistance encountered. While the natural "flexing" action of the hose will work to minimize buildup, I would still assign a "knocker" to pound them with a rubber mallet on occasion!

    To minimize downtime, since your conveying distance is relatively short, I would strongly consider running parallel conveying lines outfitted with hose connections on either end. When one of the ells finally wears through, or the inevitable buildup finally creates a plug, you can quickly switch to the second conveying line and keep running while you attend to the problem with the first one.

    Good luck!

  10. #10
    Join Date
    Dec 02
    Posts
    11

    Conveying TiO2

    Gentlemen thank you all for your response. Recently I have been asked to design a system that will be handling a number of materials including TiO2. In the 25 years I've been designing dilute phase pneumatic systems I've always stayed away from conveying TiO2 but never really had a good reason for that attitude.

    Sometimes I believe we miss opportunities because of the traditions we've established for ourselves and I wanted to see what the experience of others had been. It's obvious that, like many aspects of bulk material handling, there is a wide range of opinions.

    Thank you all for your replies.

    Allen Powell
    Allen L. Powell

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