Last Post 12 Oct 2017 05:07 PM by  William Hall
Knudsen bowl concentrator?
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David Hay
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18 Sep 2017 10:10 AM
    I've watched a few videos of different machines but can't tell which direction they spin.
    I know which direction I think they should.

    If one were to stick their finger in a ridge half way down, then spun the bowl the correct direction, would their finger end up at the top or bottom?

    Thank you
    William Hall
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    19 Sep 2017 05:20 PM
    Neither the top nor the bottom, your finger "should" end at the middle hole where the heavies would drop through into a catch cup

    Bill
    David Hay
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    19 Sep 2017 05:34 PM
    My understanding was that the Knudsen Bowl was a deep cone not a flat spiral wheel. Fed by a pipe down the center to close to the bottom. The axis is vertical, not tilted. It was spun fairly fast, not slow like a wheel. Lots of water circulated till done, then a plug removed in the bottom and everything left was flushed out.
    William Hall
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    20 Sep 2017 05:15 PM
    Sorry, thought it was a wheel
    Learn something new today LOL

    Jump over to golddredgerdotcom, ask the question there
    A member used to own a prospecting store in socal, Im sure he would know
    The fellow is HoserJohn, if he dont know, no one will

    Bill
    David Hay
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    20 Sep 2017 07:24 PM
    Thanks,

    That's a new forum on me, I thought I had researched for all of them.
    I'll check it out.
    WALTER EASON
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    25 Sep 2017 07:49 AM
    This will explain how the Knudsen Bowl works, newer versions also have an automated extraction of heavy materials without shutting down. here is a video of the workings explained:  https://www.youtube.com/watch?v=h1NEG0xQI-g&feature=youtu.be



    David Hay
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    26 Sep 2017 11:37 AM
    Thanks Walter,

    That link didn't take me to any particular video. There was a list of totally unrelated vids after just one about a Knelson concentrator.
    A Knelson concentrator is a deep cone but with concentric rings, not a spiral groove, as well as other patented special high tech features.
    I couldn't find any new vids that answer my question. Sorry.
    WALTER EASON
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    27 Sep 2017 08:16 AM

     you may need to cut and paste or search the name of video on y tube.

    MM35 knelson concentrator:    https://www.youtube.com/watch?v=h1NEG0xQI-g&feature=youtu.be

      Knelson Batch - How It Works:  https://www.youtube.com/watch?v=Y02WRGzbt-o

     

    Small scale gold mining - Knudsen bowl gold concentrator: https://www.youtube.com/watch?v=Egik4BPfVX8

    MARK CHRISTIANSON
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    10 Oct 2017 09:24 PM
    A good description of the Knudsen bowl concentrator with pictures and the patent number from 1942 can be found at the following location.

    https://riosuerte.com/in-the-beginning-there-was-gold/day-81-placer-gold-recovery-methods-xxi/
    William Hall
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    12 Oct 2017 05:07 PM
    At least two YouTube vids that explain how the thing works using a cut away Knelson bowl to see what it's doing, as well as other vids on this equipment.
    Love to see one live operations

    Bill
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