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Thread: Submicron Glass Powder - What Process?

  1. #1
    doctorsundar Guest

    Submicron glass powder - what process?

    A client wants to pulverize broken glass bottles to a powder all of which is below 1 micron. What process should I recommend? What kind of mill can do that?

    Sundar

  2. #2
    Lawrence K. Nordell

    Lawrence K. Nordell

    President and CEO

    Conveyor Dynamics Inc. [eDir]

    Conveyor Dynamics Inc.

    Professional Experience 58 Years / 7 Month Lawrence K. Nordell has 58 Years and 7 Month professional experience

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    You did not specify the tonnage or feed size. There are a number of milling systems. I'll pick one.

    Micro Grinding Systems
    1823 East 17th Street
    Little Rock, Arkansas 72202
    (501) 374-8402
    http://www.microgrind.com/

    Lawrence Nordell
    Conveyor Dynamics, Inc.

  3. #3
    doctorsundar Guest
    2 tons per hour production or feed rate. The feed size is broken glass bottles, say 5 cm or 2 inches.

    If a feed size of 150 microns, i.e., glass powder, is available, then I suspect that there will be more processes that can produce submicron powder. But ideally, we are looking for a one step process to convert 5 cm glass shards to a powder with less than 1 micron particle size.

    Sundar

  4. #4
    Lawrence K. Nordell

    Lawrence K. Nordell

    President and CEO

    Conveyor Dynamics Inc. [eDir]

    Conveyor Dynamics Inc.

    Professional Experience 58 Years / 7 Month Lawrence K. Nordell has 58 Years and 7 Month professional experience

    Discussions 2608 Lawrence K. Nordell acceded to 2608 discussions, Articles 0 Lawrence K. Nordell wrote 0 articles, Publications 0 Lawrence K. Nordell Nordell released 0 publications

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    You are looking for the near impossible with the proviso to be both feasible and cost effective.

    The reduction stage is about 50000 micron to 1 micron. A typical reduction stage of crushing or milling equipment ranges in the neighborhood of 6:1 in a single pass and can be increased with increased recirculating load. This assumes the measurement is tied to P80.

    I recommend you read: "Mineral Comminution Circuits Their Operation and Optimisation" produced and published by JKMRC as a part of Queensland Univ. in Brisbane Australia. Look to JK Tech their commercial arm.

    Also look to cement milling, but on a small scale to see how to get down to one micron. There are a class of milling machines called micronizers, and nutation mills that grind material to facial powders, paint additives, lubrication additives, and fine fillers for polymers and the like.

    Consider wear and power.

    If Rittinger is right, this is going to take 500-1000 kw-hrs/ton. You are in the realm of state-of the art and experimental machines.

    I work in the scale from 1500mm to 100 microns. One micron is a little out of my league.

    I thought you might not get to many responses. I am trying to give a little insight.

    Lawrence Nordell
    Conveyor Dynamics, Inc.
    www.conveyor-dynamics.com

  5. #5
    Lawrence K. Nordell

    Lawrence K. Nordell

    President and CEO

    Conveyor Dynamics Inc. [eDir]

    Conveyor Dynamics Inc.

    Professional Experience 58 Years / 7 Month Lawrence K. Nordell has 58 Years and 7 Month professional experience

    Discussions 2608 Lawrence K. Nordell acceded to 2608 discussions, Articles 0 Lawrence K. Nordell wrote 0 articles, Publications 0 Lawrence K. Nordell Nordell released 0 publications

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    Know-How Design (1521) Lawrence K. Nordell used this tag 1521 times, Pipe Conveyor (238) Lawrence K. Nordell used this tag 238 times, Chutes (119) Lawrence K. Nordell used this tag 119 times


  6. I support Mr. Nordell's comments on this subject, as well as your own observation that pre-grinding changes the picture.

    As I see it, the process specification is unrealistic. Having been intimately involved in this field, I do not believe there is a single process unit capable of perfoming the task as specified.

    From your description, your client desires a dry grinding process. I could discuss this at length, but at a grind size of 1 micron, there is no single commercial machine that can operate at 2 tph.

    It is possible to dry grind to the desired size if the starting material is around 200 microns, but there are numerous problems to be overcome.

    Dry grinding at this size typically requires a stirred ball mill. These come in two forms: air swept and direct. The problem with an air swept mill is the classification step. You will not be able to classify ground glass at 1 micron. For one thing, it will have enormous surface energy through mechano-chemical activation.

    A direct grinding mill will suffer heat build-up. This limits it's physical size and therefore throughput. At best, even with the largest mills available, multiple units would be required. Significant capital costs would be involved. Numerous processing issues also arise.

    Wet grinding at the energy inputs suggested is possible, but this implies multiple process steps. including drying at least. Also, I suspect that glass dissolution will occur.

    I suggest that the specification needs to be relaxed. Options are numerous, depending on the process objectives.

    If you would like to discuss this further, please feel free to contact me through this forum.

  7. #7
    Applicon Guest

    Glass Powder

    We recently completed a system to produce glass powder d50=20u from a feed of -30 mm glass as quenched. This system used coarse and tertiary crushing to prepare the feed to a fluid bed jet mill. All equipment was designed for the very abrasive conditions, with minimal ferrous contamination to the powder.

    This same system can be used to make Mr. Sundar's requested 1 micron powder, but of course at greater power required or reduced throughput.

    If interested, we can send samples of the powder produced, and offer budget proposal for a similar system suited to end user requirements.

  8. #8
    Adi_Mogilevsky Guest

    glass powder milling.

    Dear sir,
    We know that Union Process has a solution for the glass powder milling.
    Please contact Mr. Arno Szegvari and mention us as a reference.
    e-mail: aszegvari@unionprocess.com
    http://www.unionprocess.com
    P.S. we have a solution for the glass powder classification on 10 to 300 micron range - www.sor-tech.com
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  9. #9
    vijayshakti Guest

    Re: Submicron glass powder - what process?

    Originally posted by doctorsundar
    A client wants to pulverize broken glass bottles to a powder all of which is below 1 micron. What process should I recommend? What kind of mill can do that?

    Sundar
    Dear Sir first yopu have to make the primary grinding of the glass in the ball mill upto 40 Micron then you have to feed it into the Microniser , as we manufacture the primary ball upto 40 micron 95% pass my email is : vijayshakti@sancharnet.in,
    aawiting for your reply,
    Mahesh Sharma

  10. #10
    Join Date
    Jan 02
    Posts
    7

    Submicron glass powder

    We are specialised on fine grinding and micronising, and we find this kind of processes very often.

    We probably would propose a ball mill (maybe Al2O3 protected against abrasion) and a classifying circuit. We have classifiers cutting at 98%<3m, so I think we could reach your customer's requierements.

    Rought information at: www.ecutec.de or www.ecutec.es , and please do not hesitate to contact us for further details.

    Best regards to all,

    lex Farreras
    Ind. Eng.
    a.farreras@ecutec.es

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