Maid O'Mud on fri 3 sep 04
Ivor said I did right by including my zinc in the bisque load, and =
suggested mortar and pestle. I'm sure it would work; BUT I *thought* =
that calcining would be enough to turn lumps to powder. At least, =
that's what's been said here on clayart.
I'm looking for a non-dusty alternative to mortar and pestle please.
Or, do I just chuck the kg of zinc, and buy new stuff?
Sam Cuttell
Maid O'Mud Pottery
RR 1
Melbourne, Ontario
N0L 1T0 =20
CANADA
=20
"First, the clay told me what to do.
Then, I told the clay what to do.
Now, we co-operate."
sam 1994
=20
http://www.ody.ca/~scuttell/
scuttell@ody.ca
Mary K on fri 3 sep 04
Dear Sam,
After you calcine the zinc place it in a large sturdy zip lock bag, and seal. First extract as much air as possible (very Important) Then you just roll over it a few times with a rolling pin! Voila....baby powder....I do it all the time!
Hope this helps, Mary K
(ummmmm, I think I omitted this in the last discussion, sorry)
Maid O'Mud wrote:
Ivor said I did right by including my zinc in the bisque load, and suggested mortar and pestle. I'm sure it would work; BUT I *thought* that calcining would be enough to turn lumps to powder. At least, that's what's been said here on clayart.
I'm looking for a non-dusty alternative to mortar and pestle please.
Or, do I just chuck the kg of zinc, and buy new stuff?
Sam Cuttell
Maid O'Mud Pottery
RR 1
Melbourne, Ontario
N0L 1T0
CANADA
"First, the clay told me what to do.
Then, I told the clay what to do.
Now, we co-operate."
sam 1994
http://www.ody.ca/~scuttell/
scuttell@ody.ca
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John Hesselberth on fri 3 sep 04
Hi Sam,
Do an experiment for us please. Put some of your lumpy zinc oxide--not
the stuff that has been fired to bisque temperature--in your oven and
heat it to 250F for a couple hours. See if that will then become
powdery again more easily than that which you have calcined. What I am
concerned about is that you may have impurities in small quantities
that may actually melt at bisque temperatures. If so that could make
the lumpiness worse.
Anyhow I am wanting to test the theory that calcining lumpy/damp zinc
oxide is not necessary and may be the wrong thing to do. Seems to me
just drying it out should be enough.
Let us know the results if you do the experiment.
Regards,
John
On Friday, September 3, 2004, at 09:55 AM, Maid O'Mud wrote:
> BUT I *thought* that calcining would be enough to turn lumps to
> powder. At least, that's what's been said here on clayart.
John Hesselberth
http://www.frogpondpottery.com
http://www.masteringglazes.com
Ivor and Olive Lewis on sat 4 sep 04
Dear Sam,
I forgot to make a point about calcining.
At 1000=BA Zinc oxide is on the cusp of the Tamman Temperature range so
it is probable that there is a certain degree of Sintering.
People who wish to avid this should choose a calcination temperature
below th potential sintering temperature.
Best regards,
Ivor Lewis.
Redhill,
S. Australia.
Sandi Taylor on sat 4 sep 04
Hi,
Several months ago I calcined zinc oxide to our bisque temperature of 06.
It melted into a large hard lump. I would also like to know how high to
fire the zinc oxide. Is it not for removing chemical water and thus the zinc
will become powder and go easily through the sieve?
Thank you
Sandi Taylor----- Original Message -----
From: "John Hesselberth"
To:
Sent: Friday, September 03, 2004 7:10 PM
Subject: Re: Zinc ox - again - RR?
> Hi Sam,
>
> Do an experiment for us please. Put some of your lumpy zinc oxide--not
> the stuff that has been fired to bisque temperature--in your oven and
> heat it to 250F for a couple hours. See if that will then become
> powdery again more easily than that which you have calcined. What I am
> concerned about is that you may have impurities in small quantities
> that may actually melt at bisque temperatures. If so that could make
> the lumpiness worse.
>
> Anyhow I am wanting to test the theory that calcining lumpy/damp zinc
> oxide is not necessary and may be the wrong thing to do. Seems to me
> just drying it out should be enough.
>
> Let us know the results if you do the experiment.
>
> Regards,
>
> John
>
> On Friday, September 3, 2004, at 09:55 AM, Maid O'Mud wrote:
>
> > BUT I *thought* that calcining would be enough to turn lumps to
> > powder. At least, that's what's been said here on clayart.
> John Hesselberth
> http://www.frogpondpottery.com
> http://www.masteringglazes.com
>
>
____________________________________________________________________________
__
> Send postings to clayart@lsv.ceramics.org
>
> You may look at the archives for the list or change your subscription
> settings from http://www.ceramics.org/clayart/
>
> Moderator of the list is Mel Jacobson who may be reached at
melpots@pclink.com.
>
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