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Thread: Flow Properties of TiO2

  1. #1
    Join Date
    Nov 01
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    1

    Flow properties of TiO2

    Is there anybody who has experiences in measuring flow properties of different titanium dioxide pigments? Which device should be used for these particles (diameter 0.2 - 0.4 µm)? I know that TiO2-pigments have bad flowing properties.

  2. Flow property measurement for TiO2

    If you are looking to determine the flow properties of TiO2, I would suggest that the quickest (and most useful)route would be to use an annular shear cell for the internal flow properties and a jenike type shear cell for the wall friction measurements.

    Many organisations can offer this type of flow measurement service. If you would like to talk over your exact requirements, please feel free to e-mail me at The Wolfson Centre for Bulk Solids Handling Technology, Univ. Greenwich, London.

    Regards

    Richard Farnish
    (r.j.farnish@gre.ac.uk)

  3. #3
    Reg Freeman - U.K. Guest

    Flowability of Titanium Dioxide

    TiO2 is of course, very cohesive and very affected by aeration and by the degree of compaction or consolidation. It is also very flow rate sensitive. You could evaluate flowability as a function of each of these factors by using an instrument such as the FT3 Powder Rheometer.

    You could expect to obtain various flowability indices for each of your different TiO2 materials with clear indications of how they compared. The FT3 is very sensitive and the measurements are exceptionally repeatable.

    For info see website www.freemantech.co.uk

    For contact or sample testing, email; as below

    Regards,

    Reg Freeman reg@freemantech.co.uk

  4. TiO2 testing

    As with all bulk materials, the interesting physical properties for designing reliable hoppers are the relevant bulk density, wall friction and shear strength. The theory, method and instrumentation for securing these values, as developed by Jenike and published in Bul 123 of the Utah University Experimental Station in 1964, are covered by the I.Chem.E. publication 'Standard Shear Testing Technique'

    Much practical powder testing work on this material was carried out at the Bradford University School of Powder Technology some years ago because of its classic poor flow properties. The material is commonly manufactured in fine powder form, such that it is cohesive and has high surface friction on contact surfaces, which results in its difficult handling characteristics.

    Tony Birks undertook much of this powder testing and both theoretical and experimental work on other testing methods. He is now located at the Wolson Centre for Bulk Solids Handling Technology at the University of Greenwich. See www.bulksolids.com. I am sure that he would be able to assist in your requirements.

    Lyn Bates

  5. Flow properties titanium dioxide

    Dear sir

    IPT is market leader of shear testers and of the laboratory equipment. In our lab is titanium dioxide measured many times. We can suggest you to send a sample to our lab and we eill measure it for you. We can offer you leasing of an equipment for few months, so would be able to try it in own surrounding.

    You problem can simply be solved by using of the “Peschl SHEAR TESTER – astm standard D6682” which is available in special design for quality control or for generally use in laboratory.

    We invite yo also to conside to use our silo an discharg system which is also approved many times in the painting industry.

    PLEASE VISIT OUR WEBSITE AND CONTACT US FOR FURTHER DEVELOPMENT OF A COOPERATION. WWW.IPT-ONLINE.COM.


    Best regards

    IPT
    Dr. Ivan Peschl

  6. #6
    Dr M Bradley Guest
    To answer this question properly, we need to know what the purpose of your measurements is.

    If you want to measure the flow properties as properly defined, then the only thing is a shear cell, whether Jenike or Walker type (or for that matter Peschl or Schwedes, which are nothing more than developments of Walker). No other means will give you actual flow property measurements. We use both here and have done measurements of many grades of TiO2 with great success, for hopper designs, comparative benchmarking, QC etc.

    Instruments such as the Freeman FT3 or the Indiciser will only give you comparative indications and not true flow properties. In my experience the Hausner Ratio is every bit as good and much cheaper to measure (tapped bulk density divided by poured bulk density).

    Find us at www.bulksolids.com for further information.

  7. TiO2 flow

    Are you looking for differences of flow characteristics between TiO2 types and products as neet products? Or are you looking for powder flow in end product? That does make a significant difference.

    You may wish to talk to John Birmingham at DuPont- 302/999-2014.

    Would like to talk to you about this issue.

    jstiverson@aol.com
    317/467-7570

    John Stiverson
    Lake Counties Consultants, Inc.
    1522 N. State St. PMB 313
    Greenfield, IN 46140

  8. #8
    BrianHRutledge Guest

    Dry & Slurry TiO2 flow experience

    Yes, TiO2 is challenging in dry or high-solids liquid form. I have done engineering work in this area, as a traveling tech service engineer for a major TiO2 manufacturer. High density; abrasive; sticky in humid environment. What specifically is the issue?

  9. #9
    BrianHRutledge Guest
    jstiverson raises an excellent point. Different grades from various suppliers flow differently. If, for instance, you are looking for >98% TiO2 to supply Ti, rather than an optical pigment, there are "glass grades" available which have better flow characteristics than the pigment-quality version of the same product. Reason is effective particle size of 2 rather than 0.2

  10. #10
    Dr M Bradley Guest

    Flowability of different grades of Tio2

    Brian Rutledge is exactly right with regard to the different grades. We have measured the flowability of many different grades, of both the two different mineral habits and with different coatings, sizes etc.

    If you want a grade which is free flowing, but not too bothered by dispersability, then there are some plastics grades which are actually granulated - Tioxide makes one - and these handle almost like dry sand. They are well worth looking at depending on your application.

    On the other hand, if you have to use a less free flowing grade it is actually not a problem as long as you invest in a properly designed MASS FLOW hopper or silo. We've designed lots of silos for TiO2 using this approach, it requires measurement of flowability but you finish up with something cheap to build, easy to maintain, no need for vibration or large aoounts of fluidisation (though some SMALL amount of air injection is desirable) and it ALWAYS discharges reliably and in a controlled condition of bulk density and discharge rate. That's more than you can say for any other approach!

    If you don't want to cross the pond to talk to us, then J&J can do this for you closer to home. That proves this is not just a sales pitch! But there is no doubt that a proper mass flow silo will deal with TiO2 with absolutely no problem whatsoever. It really works like a dream and so many people are amazed to see how easy a material TiO2 is to handle - IF you have the right equipment!

    Mike.

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