David Woof on mon 12 oct 09
..Hi Larry=3D2C
=3D20
How about this as a "safe" alternative: incrementally add the glaze scrap=
=3D
to your clay scrap=3D2C reclaim and then make the "10" X 10" crocks" as pl=
an=3D
ters and sculptural vessels. I know of a certain well known potter who f=
=3D
or many years has regularly added glaze scrap to his utilitarian clay bodie=
=3D
s with no ill effects to himself=3D2C his customers=3D2C or the pottery and=
gla=3D
zes he uses. I'll leave it to him to speak to this if he chooses.
=3D20
Seems that all that firing=3D2C wasted fuel=3D2C carbon footprint....just t=
o pr=3D
otect the environment from the earth materials in scrap glaze is somehow an=
=3D
oxy...or counter productive to the original intent.
=3D20
Alternative #2
The solution to pollution is dilution=3D3B some minerally depleted fallow =
fa=3D
rm field would just love to absorb the mineral content of your scrap splosh=
=3D
ed or sprayed over a wide area.
=3D20
Best=3D2C=3D20
=3D20
David
=3D20
________________________________________________________________________
2. Glaze disposal firing temp
Posted by: "Larry Kruzan" larry_kruzan@COMCAST.NET=3D20
Date: Mon Oct 12=3D2C 2009 11:01 am ((PDT))
Hi all=3D2C
I=3D92m throwing some heavy crocks=3D2C 10=3D94 diameter=3D2C 10=3D94 tall=
=3D2C =3DBD=3D94 =3D
wall. I plan to
fill these with dried glaze scrap that I will fire before disposal. Giving
the thermal mass involved (I have 30 of these)=3D2C just what kind of firin=
g
schedule would you use.
I know some may be wondering about the amount of glaze =3D96 It is the scra=
p =3D
I
have collected over 6 years and now I just need to dispose of it in a safe
manner.=3D20
Larry Kruzan
Lost Creek Pottery
www
=3D20
=3D0A=3D
_________________________________________________________________=3D0A=3D
Hotmail: Trusted email with Microsoft=3D92s powerful SPAM protection.=3D0A=
=3D
http://clk.atdmt.com/GBL/go/177141664/direct/01/=3D
Larry Kruzan on mon 12 oct 09
Hi all,
I=3D92m throwing some heavy crocks, 10=3D94 diameter, 10=3D94 tall, =3DBD=
=3D94 =3D
wall. I plan to
fill these with dried glaze scrap that I will fire before disposal. =3D
Giving
the thermal mass involved (I have 30 of these), just what kind of firing
schedule would you use.
=3D20
I know some may be wondering about the amount of glaze =3D96 It is the =3D
scrap I
have collected over 6 years and now I just need to dispose of it in a =3D
safe
manner.=3D20
=3D20
Larry Kruzan
Lost Creek Pottery
www.lostcreekpottery.com
=3D20
Kathy Ransom on tue 13 oct 09
You can get some cool glazes by combining your excess and old glazes. I =
=3D
already have "Limited Edition #1" glaze and am working on the next. Of =3D
course this works unless they contain lead, etc. and assuming you can =3D
correct any faults.
Kathy Ransom
Bruce Girrell on tue 13 oct 09
Larry Kruzan wrote:
I'm throwing some heavy crocks, 10" diameter, 10" tall, =3DBD" wall. I plan=
t=3D
o fill these with dried glaze scrap that I will fire before disposal.
Larry - Why would you want to do that? Remember that glaze materials are ba=
=3D
sically ground up rocks. They're not toxic. Elements that we're somewhat to=
=3D
uchy about - copper, cobalt, manganese, etc - are bound up as oxides. The E=
=3D
arth contains these things in its crust all over the place. What is 100 gra=
=3D
ms more going to do?
You're talking about creating a ceramic object that will last thousands of =
=3D
years. To what end? It certainly won't have any measurable effect on the me=
=3D
tal ions present in our water supply.
If you simply can't bear the thought of scattering your glazes on the groun=
=3D
d (and perhaps there are some places where this shouldn't be done), then dr=
=3D
y the glaze and put it in your regular trash where it will be hauled off to=
=3D
a sealed landfill. All firing the waste glaze will do is compound the prob=
=3D
lem by using more fossil fuels and converting the relatively inert metal ox=
=3D
ides in the glaze to highly reactive metallic ions in the kiln exhaust.
Bruce Girrell
Jess McKenzie on tue 13 oct 09
David Woof wrote, in part:
Seems that all that firing, wasted fuel, carbon
footprint....just to protect the environment from the earth
materials in scrap glaze is somehow an oxy...or counter
productive to the original intent.
....................
OXY? We're trying to work in "REDuctio ad absurdum," here,
but we don't want to push it... ~joan and jess
David Hendley on tue 13 oct 09
Larry, I hesitated in replying to your enquiry at the risk of
sounding overly critical and judgmental. But, since David
Woof brought it up, your plan also sounds counter-productive
to me - the proverbial throwing out the baby with the bathwater,
or cutting down the trees to save the forest.
I don't know if I am the "certain well known potter" David W.
is referring to, but I have many times on Clayart advised people
to simply add bits of leftover glaze to their claybodies. It's
simple and quick if you mix your own clay, but not as practical
if you buy readymade clay.
To prove the point, I mixed a cup of an iron saturate glaze in
100 pounds of porcelain - it had no noticeable effect in the
fired clay. Several cups of glaze can be mixed in 100 pounds
of stoneware to no effect. I know, I know, the glaze is adding
flux and color, but this is theoretical and it makes no practical
observable difference in the fired clay.
Since you have a large quantity of glaze scraps, I would advise
that you follow David's Alternative #2. In your semi-rural
location you should have no problem finding spots to simply
return the material to the earth. You are not dealing with
toxic substances. 95% or more of a glaze is totally benign
material such as clay and ground up rocks. The small percentage
of metallic oxides will be so diluted that they will be perfectly
safe returned to the ground.
Heck, here where I live, gardeners and farmers pay good
money to have dolomite and whiting spread on their land,
and our soil is so sandy a little clay is also appreciated.
Using the energy to melt all your mass of material would
serve no one and certainly not the environment, besides being
a waste of your time, energy, and even more new materials.
David Hendley
david@farmpots.com
http://www.farmpots.com
----- Original Message -----
How about this as a "safe" alternative: incrementally add the glaze scrap
to your clay scrap, reclaim and then make the "10" X 10" crocks" as planter=
s
and sculptural vessels. I know of a certain well known potter who for
many years has regularly added glaze scrap to his utilitarian clay bodies
with no ill effects to himself, his customers, or the pottery and glazes he
uses. I'll leave it to him to speak to this if he chooses.
Seems that all that firing, wasted fuel, carbon footprint....just to protec=
t
the environment from the earth materials in scrap glaze is somehow an
oxy...or counter productive to the original intent.
Alternative #2
The solution to pollution is dilution; some minerally depleted fallow farm
field would just love to absorb the mineral content of your scrap sploshed
or sprayed over a wide area.
Lee Love on tue 13 oct 09
On Mon, Oct 12, 2009 at 11:46 PM, David Woof wrote:
> The solution to pollution is dilution; =3DA0some minerally depleted fallo=
w =3D
farm field would just love to absorb the mineral content of your scrap splo=
=3D
shed or sprayed over a wide area.
You know what. I don't believe we have enough information. If
these are lead glazes, I would not be putting on a field.
Larry, probably you have tried this, but Warren MacKenzie's blue is
made from scrap glazes from the shop. He just adds cobalt to taste.
--
Lee Love, Minneapolis
"The tea ceremony bowl is the ceramic equivalent of a sonnet: a
small-scale, seemingly constricted form that challenges the artist to
go beyond mere technical virtuosity and find an approach that both
satisfies and transcends the conventions." -- Rob Sliberman
full essay: http://togeika.multiply.com/journal/item/273/
Lee Burningham on tue 13 oct 09
Howdy,
=3D20
I agree with David Hendley about mixing glazes back into your clay body. =
=3D
Or, you set aside a separate bucket for all your glaze scraps and create a =
=3D
"Garbage" glaze. The random and always changing combinations will either =
=3D
excite, exhilarate, or frustrate you but never bore you.=3D20
=3D20
Lee Burningham
jonathan byler on tue 13 oct 09
as long as you are not using toxic stuff in the glazes that can be
absorbed through the skin, or any small cuts you have on your hands.
On Oct 13, 2009, at 4:30 PM, Lee Burningham wrote:
> Howdy,
>
> I agree with David Hendley about mixing glazes back into your clay
> body. Or, you set aside a separate bucket for all your glaze scraps
> and create a "Garbage" glaze. The random and always changing
> combinations will either excite, exhilarate, or frustrate you but
> never bore you.
>
> Lee Burningham
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