JJHerb@aol.com on thu 5 dec 96
May I suggest mixing your unwanted glaze materials with portland cement paste
and, following setting, off to the land fill. Cement shoes for your unwanted
glaze materials. The materials as dust are more of a problem than if
solidified in anyway. This dust danger is to you and to the handlers on the
way to wherever it goes. The cement will remain unchanged for centuries or
longer and release things slowly, if at all. As for defending your landfill
from your paltry amount of bad stuff -:- the colored ink on one edition of a
major city Sunday newspaper advertising is more and worse heavy metals than
anything you have, power companies put tons of flyash into landfills and each
of the tons contains some significant amount of arsenic, legally or
illegally, lots of car batteries are in and are entering landfills, and
finally, concentrated sludge from municipal sewage treatment plants (Lots of
heavy metals there) may go into a landfill. None of this is good and it will
cause us problems in the future but the possible contributions of an
individual potter are really kind of small.
Joseph Herbert
JJHerb@aol.com
Kenneth D Wetfall on sat 7 dec 96
On Thu, 5 Dec 1996 08:33:28 EST JJHerb@aol.com writes:
>----------------------------Original
>message----------------------------
>May I suggest mixing your unwanted glaze materials with portland
>cement paste
>and, following setting, off to the land fill. Cement shoes for your
>unwanted
>glaze materials. The materials as dust are more of a problem than if
>solidified in anyway. This dust danger is to you and to the handlers
>on the
>way to wherever it goes. The cement will remain unchanged for
>centuries or
>longer and release things slowly, if at all. As for defending your
>landfill
>from your paltry amount of bad stuff -:- the colored ink on one
>edition of a
>major city Sunday newspaper advertising is more and worse heavy metals
>than
>anything you have, power companies put tons of flyash into landfills
>and each
>of the tons contains some significant amount of arsenic, legally or
>illegally, lots of car batteries are in and are entering landfills,
>and
>finally, concentrated sludge from municipal sewage treatment plants
>(Lots of
>heavy metals there) may go into a landfill. None of this is good and
>it will
>cause us problems in the future but the possible contributions of an
>individual potter are really kind of small.
>
>Joseph Herbert
>JJHerb@aol.com
>
I highly recomned that you do not use Cemment to stablize old glazes.
Cemment is a limestone product which is easily broken down by weathering,
carbolic acid, and a multitude of other corrosive agents. Mixing
glaze with cemment also doesn't create a chemical bond just, a
mechanical bond. To truly stablize old glaze material it has to be
chemical bonded into stable compound.
Kenneth
potter-ken@juno.com on sun 8 dec 96
From: Kenneth D Wetfall
----------------------------Original message----------------------------
On Thu, 5 Dec 1996 08:33:28 EST JJHerb@aol.com writes:
>----------------------------Original
>message----------------------------
>May I suggest mixing your unwanted glaze materials with portland
>cement paste
>and, following setting, off to the land fill. Cement shoes for your
>unwanted
>glaze materials. The materials as dust are more of a problem than if
>solidified in anyway. This dust danger is to you and to the handlers
>on the
>way to wherever it goes. The cement will remain unchanged for
>centuries or
>longer and release things slowly, if at all. As for defending your
>landfill
>from your paltry amount of bad stuff -:- the colored ink on one
>edition of a
>major city Sunday newspaper advertising is more and worse heavy metals
>than
>anything you have, power companies put tons of flyash into landfills
>and each
>of the tons contains some significant amount of arsenic, legally or
>illegally, lots of car batteries are in and are entering landfills,
>and
>finally, concentrated sludge from municipal sewage treatment plants
>(Lots of
>heavy metals there) may go into a landfill. None of this is good and
>it will
>cause us problems in the future but the possible contributions of an
>individual potter are really kind of small.
>
>Joseph Herbert
>JJHerb@aol.com
>
I highly recomned that you do not use Cemment to stablize old glazes.
Cemment is a limestone product which is easily broken down by
weathering,
carbolic acid, and a multitude of other corrosive agents. Mixing
glaze with cemment also doesn't create a chemical bond just, a
mechanical bond. To truly stablize old glaze material it has to be
chemical bonded into stable compound.
Kenneth
Gavin Stairs on sun 8 dec 96
At 12:58 PM 07/12/96 EST, you wrote:
>----------------------------Original message----------------------------
>
>On Thu, 5 Dec 1996 08:33:28 EST JJHerb@aol.com writes:
>>----------------------------Original
>>message----------------------------
>>May I suggest mixing your unwanted glaze materials with portland
>>cement paste
>>and, following setting, off to the land fill. Cement shoes for your
>>unwanted
>>glaze materials. The materials as dust are more of a problem than if
>>solidified in anyway. This dust danger is to you and to the handlers
>>on the
>>way to wherever it goes. The cement will remain unchanged for
>>centuries or
>>longer and release things slowly, if at all. As for defending your
>>landfill
>>from your paltry amount of bad stuff -:- the colored ink on one
>>edition of a
>>major city Sunday newspaper advertising is more and worse heavy metals
>>than
>>anything you have, power companies put tons of flyash into landfills
>>and each
>>of the tons contains some significant amount of arsenic, legally or
>>illegally, lots of car batteries are in and are entering landfills,
>>and
>>finally, concentrated sludge from municipal sewage treatment plants
>>(Lots of
>>heavy metals there) may go into a landfill. None of this is good and
>>it will
>>cause us problems in the future but the possible contributions of an
>>individual potter are really kind of small.
>>
>>Joseph Herbert
>>JJHerb@aol.com
>>
>I highly recomned that you do not use Cemment to stablize old glazes.
>Cemment is a limestone product which is easily broken down by weathering,
> carbolic acid, and a multitude of other corrosive agents. Mixing
>glaze with cemment also doesn't create a chemical bond just, a
>mechanical bond. To truly stablize old glaze material it has to be
>chemical bonded into stable compound.
>Kenneth
>
This is only part right. The setting of cement IS a chemical process, and
clay CAN be incorporated. However, the resulting body is not a glass, and
is more soluable than a fired body. Properly designed cements can be quite
durable, however, and quite good enough to contain the kinds of poisons we
are talking about. It is worth remembering that these are natural elements.
It is only the rate of leaching and the local concentration which make them
a problem. Good enough is good enough.
On the other hand, I wonder if there might not be a better way to deal with
the problem. Most dangerous pigments are a form of ore for the metal in
question. I wonder if there might not be a way to collect this stuff and
sell it for enough to recover some of the collection cost.
Bye, Gavin
Akita-jin \"Lee Love\" on mon 9 dec 96
potter-ken@juno.com wrote:
> I highly recomned that you do not use Cemment to stablize old glazes.
Not sure if this has been mentioned yet (haven't read every post in
chain) but has anyone suggested having a shop trash can blue glaze?
Take all your waste glaze and put them together and add enough cobalt to
make a good blue. Of course, this takes in to account that all your
glazes were safe to begin with.
I still have a bucket of a copper blue-green-red glaze containing
barium that I only use on vases, left over from when I was in school.
I use the same glaze on functional ware, but with Strontium substituted
for the Barium. I like the Strontium glaze better (that is why it is
taking so long to use the Barium containing glaze up.) ;^)
====================================================
/(o\ Lee Love In "St. Paul", MN ' Come see some pixs of my AkitaPup:
\o)/ mailto:LeeLove@millcomm.com ' http://www.millcomm.com/~leelove
mailto:AkitaJin@Cryogen.com ' "It gets late early out there."
-Yogi Berra-
DonKopy@aol.com on wed 18 dec 96
Hi Everyone,
>Toxic Glaze Materials Disposal<
What's in a name? Well......... it depends on who you're dealing with.
This topic has reminded me of a discussion I had a while back. A potter made
a comment in a Ceramic publication (I think it comes out monthly) about the
process described for fusing and disposing of waste glaze. I later asked him
to elaborate on the process and he told me that he had been informed that the
process constituted "processing of hazardous material", a process that is
regulated and illegal without a permit to do so.
Even though the process may indeed render such materials safe and relatively
inert, the intentional conversion was considered to be a bad thing (I
know....I know ......but someone gave him a hard time about it). The solution
was simple, ingenious, and effective. Instead of processing these "waste
materials", the potter incorporated them with some clay, poured it in thick
bisque molds, and fired them until vitrified (some line blending and
experimenting with the appropriate temperature was needed to determine just
the right mix and firing temperature) creating "paving bricks", long a
product of ceramic industry. These bricks were used to line the driveway,
make a path etc...
The brick making process bore a remarkable similartiy to the previous
disposal method but was viewed in a very different light.
Perhaps you could make some bricks, tiles, paper weights, door
stops.......etc.... too, and in the event they didn't come out well, they
could always be considered wasters and hauled off to landfill.
Hoping that someone...... sometime........ may avoid a hassle,
Regards,
Don Kopyscinski
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