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Thread: Separation of Coal and Packstone

  1. #1
    azabir Guest

    Separation coal and packstone

    Dear all,

    Regarding to our coal product, there are any stones in our coal. So we really difficult to separate it. Now, we manually pick out the stones by hand.

    Could you advise me to choose the equipment for purpose above.

    Regards.
    Achmad Zabir Ula

  2. #2
    Lawrence K. Nordell

    Lawrence K. Nordell

    President and CEO

    Conveyor Dynamics Inc. [eDir]

    Conveyor Dynamics Inc.

    Professional Experience 57 Years / 11 Month Lawrence K. Nordell has 57 Years and 11 Month professional experience

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    Dear Azabir

    One method depends on the difference in strength between stone and coal, and on the stone size distribution. With stones of reasonable size (ie. pickable by hand), a rotary breaker will do it. The breaker, with a wall aperture set smaller than the desired stone size, will break the soft, low strength, coal and pass it through the wall, and transport the stronger stones to the waste end discharge.

    Other means include separation by density difference between rock and coal. This is necessary with a very small stone size.

    Look into the science of separators and tailor the device to your unspoken criterion.

    Good Luck
    Lawrence Nordell
    Conveyor Dynamics, Inc.
    website: www.conveyor-dynamics.com

  3. #3
    azabir Guest
    Dear Mr. Nordell,

    Thank you for your advise.

    Refer to our implementation in one of coal proccesing area, we already applied the bradford breaker to separate coal and stone. But the results, separation of these materials aren't happened. Stone is also broken and together follow with coal product. And Furthermore we, manually back to apply by hand.

    We would like to know the consideration of strength different between coal and stone and also stone size distribution which the bradford breaker could be applied.

    Thank you,

    Regards,
    Achmad Zabir Ula

  4. #4
    Lawrence K. Nordell

    Lawrence K. Nordell

    President and CEO

    Conveyor Dynamics Inc. [eDir]

    Conveyor Dynamics Inc.

    Professional Experience 57 Years / 11 Month Lawrence K. Nordell has 57 Years and 11 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

    Separation of Coal & Refuse Rock

    Dear Achmad

    The separation by breaking or other process, involves knowledge of the refuse rock properties.

    You state you have tried a Bradford Breaker and found it unsatisfactory due to the stone strength was very much like the coal strength. Can you give information on the Bradford breaker specifications? Have you tested the stone strength with conventional methods such as a JKMRC drop hammer test or drum test?

    What is the type of stone - sandstone, shale ....? I will need information to characterize the material strength, size distribution, and other attributes, before I can be of help.

    Lawrence Nordell
    Conveyor Dynamics, Inc.

  5. #5
    azabir Guest
    Dear Mr. Nordell,

    We inform you that bradford breaker has the following specification:
    - Manufacture : Bulk Material PTY.LTD
    - Breaker Series : 960
    - Product : 75 mm size and smaller
    - Breaking zone : 3.6 m
    - Diameter drum : 3.0 m
    - Drive unit :
    - Electric Motor : 30 KW, trough a fluid coupling to a shaft
    mounted reducer and trough drive and driven sprockets to
    the breaker.
    - Rpm output : 11.22 rpm
    As you know, that the equipments were installed on 1985, and we heared that the manufacturer already designed with the coal and stone specification.

    The stones are silicified coal (SC) and non silicified coal (NSC) types and have the following characteristics :
    - Specific gravity (SG) : 2.04 - 2.3
    - Relative Density (RD) : 1.92 - 2.18
    - Hard Groove Index (HGI) : 40 - 113
    - Lump size (max) : 400 mm

    Thank you for your pay attention.

    Regards,
    Achmad Zabir Ula

  6. #6
    Lawrence K. Nordell

    Lawrence K. Nordell

    President and CEO

    Conveyor Dynamics Inc. [eDir]

    Conveyor Dynamics Inc.

    Professional Experience 57 Years / 11 Month Lawrence K. Nordell has 57 Years and 11 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

    Dear Achmed

    The Bradford breaker raises the product and drops it, using gravitational acceleration to produce a force sufficient to break the product (coal) but not the refuse rock. Size of the breaker diameter is choose to achieve this goal. To size the diameter you must first know the strength charateristics of coal and refuse. Either a self breakage (drop from various heights and sieve size fractions to quantify breaking strength - usually larger rock sizes) or drop hammer, as I suggested earlier, to raise the specific energy delivered to smaller size fractions. The plot of energy applied to surface area exposed yields the materials surface energy property that we use to charaterize crack tip propogation in all fracturable materials. The comminution process can then be modelled.

    Your response does not include this information, and I see further dialog on the subject, in the forum,. to be too detailed for this type of correspondence. If you wich consultation to solve the problem, chose a reputable consultant or manufacturer who are known for solving the same.

    As a side note, the Bradford breaker you are using may be to small a diameter, have improper lifters, run at the wrong speed, have the wrong grate openings, or is inappropriate for the class of material you are pdrocessing. Other euipment may be required.

    Much Luck,

    Lawrence Nordell
    Conveyor Dynamics, Inc.

  7. Dear Mr. Achmad Zabir Ula,

    I have come across a manufacturer of stone separating system. As described by the manufacturer, the system has stone sensor near conveyor head end. At the discharge end, there is a two-way chute with motorised quick action gate / grate.
    The gate position gets automatically changed on sensing of stone. This results in, the stone along with its coal being discharged into a separate heap. Thus, coal without stone is obtained. The coal heap which is having sizeable proportion of stone is treated seperately.

    The system can be located at any point in flow path.

    Regards,
    I G Mulani - Author - Book 'Engineering Science and Application Design for Belt Conveyors'.
    parimul@pn2.vsnl.net.in
    Last edited by I G Mulani; 8th December 2002 at 18:52.

  8. #8
    azabir Guest
    Dear Mr. Mulani,

    Thank you for your reply.

    Please advise us the description stone sensor widely and the company which applied them,
    And also the manufacturer's address for this purpose.


    Regards,
    Achmad Zabir Ula

  9. Dear Mr. Achmad Zabir Ula,

    As per the information and quotation available with me of 1994, the name of the company and its address are as below:

    ANATEC GmbH, Gewerbepark Sud 1,
    Gerhard-Hauptmann - Strase 15,
    D-03044 Cottbus.
    Tel.: 49-(0)355 79 52 66
    Fax.: 49-(0) 355 79 52 19

    Their Indian representative name and address is :
    Ardee Business Service Pvt. Ltd.
    9-30-4, Siripuram,
    Vishakhapatnam - 530 003
    India.

    You may contact them for the required information. Only they will be able to say where they have supplied.

    Regards,
    I G Mulani - - Author - Book 'Engineering Science and Application Design for Belt Conveyors'.
    parimul@pn2.vsnl.net.in

  10. #10
    Lawrence K. Nordell

    Lawrence K. Nordell

    President and CEO

    Conveyor Dynamics Inc. [eDir]

    Conveyor Dynamics Inc.

    Professional Experience 57 Years / 11 Month Lawrence K. Nordell has 57 Years and 11 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

    Searching nothing specified

    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

    Achmad,

    You might take a look at the following website:
    www.imperial-technologies.com

    They profess to differentially break coal and not rock by adjusting the impact speed of the "Accelerator" crusher impeller. Their website addresses the points you raise and that I have discussed wrt the Bradford Breaker. The big difference is the variable speed adjustment of the impeller to allow the operator to tune the breakage of coal and not stone. The friable coal then passes through a grate on the shell behind the tines.

    Rob Christian is the president and seems to have the expertise you require.

    I don't believe the sorter system, proposed by Mr. Mulani, can handle any reasonable tonnage. If you find it can, please advise the forum. We all have such need and have many applications in this profession.

    Best Wishes
    Lawrence Nordell
    Conveyor dynamics, Inc.

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