Gaff Pearce on wed 22 jan 03
I went tramping through the woods this past weekend and found a couple of
large pieces of feldspar which I would like to crush and use in a glaze.
Any ideas on how to do this? I am thinking of using a large ball peen
hammer but other ideas are greatly appreciated.
Gaff
gaff.pearce@gte.net
James Bledsoe on wed 22 jan 03
> I went tramping through the woods this past weekend and found a couple of
> large pieces of feldspar which I would like to crush and use in a glaze.
> Any ideas on how to do this? I am thinking of using a large ball peen
> hammer but other ideas are greatly appreciated.
>
> Gaff
the hammer is your best starting place
then depending on how fine you want it a ball mill is going to be your
friend for various lengths of time
happy crushing
jim
John Britt on wed 22 jan 03
Gaff,
If you calcine it first (to red heat) your job will be much easier. The
feldspar will crumble apart and then you can ball mill it to a fine
powder. (or smash it with a hammer).
Hope it hleps,
John Britt
iandol on thu 23 jan 03
Dear Gaff Pearce,=20
Put your cobs of felspar on a bisque platter and put them through a =
bisque firing, round about cone 08. This will thermally stress all of =
the crystals and the stuff will fall apart under the hammer. Then you =
can put it through the "Dolly Pot" to get your minus #200.
Best regards,
Ivor Lewis
Paul Herman on fri 24 jan 03
Greetings All,
OK Ivor you have piqued my curiosity. What the heck is a "Dolly Pot", a
down under expression for a ball mill?
To process my local feldspar, I take it into Reno to the mining lab and
they mill it in their "cone crusher". Last time they charged me $10 to
do about 100 lbs. I then take the 15 mesh (window screen) material and
wet ball mill for one hour to bring it down to 200 mesh or so.
I was surprised that it only took an hour to mill, and wonder why David
Hendley's ball mill takes 20 hours (!?) to grind cullet, which is softer
than feldspar. Any theories, David or anyone else?
Happy grinding,
Paul Herman
Great Basin Pottery
423-725 Scott Road
Doyle, California 96109 US
potter@psln.com
----------
>From: iandol
>To: CLAYART@LSV.CERAMICS.ORG
>Subject: Crushing feldspar
>Date: Wed, Jan 22, 2003, 11:10 PM
>
> Dear Gaff Pearce,
>
> Put your cobs of felspar on a bisque platter and put them through a bisque
> firing, round about cone 08. This will thermally stress all of the crystals
> and the stuff will fall apart under the hammer. Then you can put it through
> the "Dolly Pot" to get your minus #200.
>
> Best regards,
> Ivor Lewis
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