Bryan Stecker on sat 3 jan 98
I'm a sophmore in high school currently working on a barium leeching
project at school. I plan to uses various acidic levels of solutions
leech barium from the fallowing glaze:
32% Barium Carbonate
30% Stronrium Carbonate
18% Nepheline Syenite
6% frit 3110
4% Bentonite
4% flint
3% whiting
3% U. tile clay +4% copper corbonate
I was wondering if anyone could help me with how much this glaze could
leech with pH levels 6-9. And I was wondering if anyone could identify
what "U. tile clay" is. I copied this down and I don't know if U. is a
typo- my local supplier only knows of a "6 tile clay". If anyone could
be of any assistance with resources or information on barium leeching,
please contact me.
Bryan Stecker
rekcets@open.org
Craig Martell on sun 4 jan 98
At 11:16 AM 1/3/98 EST, you wrote:
>----------------------------Original message----------------------------
>I'm a sophmore in high school currently working on a barium leeching
>project at school. I plan to uses various acidic levels of solutions
>leech barium from the fallowing glaze:
>32% Barium Carbonate
>30% Stronrium Carbonate
>18% Nepheline Syenite
>6% frit 3110
>4% Bentonite
>4% flint
>3% whiting
>3% U. tile clay +4% copper corbonate
Hi Bryan:
I can't give you any quantitative info on Barium leaching. I can tell you
that this glaze is VERY low in silica. Even cone 012 glazes have a lower
limit of 1.25 moles of silica in the Seger formula. Your glaze has only .83
moles and this lack of silica will guarantee the glaze to leach Barium. It
also has 4% copper which will increase the solubility of the glaze and
compound the problem. You don't say at what cone you will fire this glaze so
I can't be real specific about what you need to do. If you want to do a
test for Ba leaching, it would be best to use a balanced glaze with adequate
amounts of silica and alumina. This glaze base is so poorly formulated that
I wouldn't use it for testing.
In all probability, the clay is 6 Tile Kaolin. The "U" is probably a typo.
regards, Craig Martell-Oregon
Ron Roy on sun 4 jan 98
Hi Bryan,
You don't say to what cone you will fire this glaze. My limits say that
even of fired to cone 08 is is going to release high amounts - as you
increase in temperature it only gets worse.
I calculated this glaze using Tile 6 - don't know what U tile clay is -
anybody have an analysis to send me?
There is a magazine called Ceramics Technical from Austraila - the issue
you want is #3 - 1996 it has an artical and some research on Barium
leaching. Tte name of the article is called "Living Dangerously."
I can't answer your question about the different concentrations of acid - I
do know you are going to find Ba ions in it.
>----------------------------Original message----------------------------
>I'm a sophmore in high school currently working on a barium leeching
>project at school. I plan to uses various acidic levels of solutions
>leech barium from the fallowing glaze:
>32% Barium Carbonate
>30% Stronrium Carbonate
>18% Nepheline Syenite
>6% frit 3110
>4% Bentonite
>4% flint
>3% whiting
>3% U. tile clay +4% copper corbonate
>
>I was wondering if anyone could help me with how much this glaze could
>leech with pH levels 6-9. And I was wondering if anyone could identify
>what "U. tile clay" is. I copied this down and I don't know if U. is a
>typo- my local supplier only knows of a "6 tile clay". If anyone could
>be of any assistance with resources or information on barium leeching,
>please contact me.
>
> Bryan Stecker
> rekcets@open.org
Ron Roy
93 Pegasus Trail
Scarborough,Canada
M1G 3N8
Evenings, call 416 439 2621
Fax, 416 438 7849
Studio: 416-752-7862.
Email ronroy@astral.magic.ca
Home page http://digitalfire.com/education/people/ronroy.htm
Bryan Stecker on tue 6 jan 98
Hi Craig:
Thanks for the information. I am firing to ^6 and I just test fired the glaze
and it crazed. I found this recipe in a book, but would appreciate any other
suggestions. I'm using B-mix 5 for my clay body. If you have any other
suggestions on improving this project I would welcome the input.
Thanks again,
Bryan Stecker
rekcets@open.org
Craig Martell wrote:
> ----------------------------Original message----------------------------
> At 11:16 AM 1/3/98 EST, you wrote:
> >----------------------------Original message----------------------------
> >I'm a sophmore in high school currently working on a barium leeching
> >project at school. I plan to uses various acidic levels of solutions
> >leech barium from the fallowing glaze:
> >32% Barium Carbonate
> >30% Stronrium Carbonate
> >18% Nepheline Syenite
> >6% frit 3110
> >4% Bentonite
> >4% flint
> >3% whiting
> >3% U. tile clay +4% copper corbonate
>
> Hi Bryan:
>
> I can't give you any quantitative info on Barium leaching. I can tell you
> that this glaze is VERY low in silica. Even cone 012 glazes have a lower
> limit of 1.25 moles of silica in the Seger formula. Your glaze has only .83
> moles and this lack of silica will guarantee the glaze to leach Barium. It
> also has 4% copper which will increase the solubility of the glaze and
> compound the problem. You don't say at what cone you will fire this glaze so
> I can't be real specific about what you need to do. If you want to do a
> test for Ba leaching, it would be best to use a balanced glaze with adequate
> amounts of silica and alumina. This glaze base is so poorly formulated that
> I wouldn't use it for testing.
>
> In all probability, the clay is 6 Tile Kaolin. The "U" is probably a typo.
>
> regards, Craig Martell-Oregon
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