Lissy DeLeer on mon 10 mar 03
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Hello ClayArt!
Is it even possible to reformulate this glaze with petalite instead of lithium carbonate? It looks very interesting but I can't get the Li.Ca...
///Lissy
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Ababi on mon 10 mar 03
I can try if you send the recipe
Ababi Sharon
Glaze addict
Kibbutz Shoval Israel
ababisha@shoval.org.il
http://members4.clubphoto.com/ababi306910/
http://www.milkywayceramics.com/cgallery/asharon.htm
and also
http://www.israel-ceramics.org/membersGallery/personalpage.asp?MID=507
---------- Original Message ----------
>Hello ClayArt!
>Is it even possible to reformulate this glaze with petalite instead of lithium
carbonate? It looks very
>interesting but I can't get the Li.Ca...
>///Lissy
>______________________________________________________________________________
>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.
Lily Krakowski on mon 10 mar 03
Might be-- if we saw the recipe......
Lissy DeLeer writes:
> Hello ClayArt!
>
> Is it even possible to reformulate this glaze with petalite instead of lithium carbonate? It looks very interesting but I can't get the Li.Ca...
>
> ///Lissy
>
Lili Krakowski
P.O. Box #1
Constableville, N.Y.
(315) 942-5916/ 397-2389
Be of good courage....
Lissy DeLeer on wed 12 mar 03
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Ok, sorry! It felt su urgent I pressed "send" before I had pasted in the recipe. Here goes:
Potash feldspar LR 28,70
Barium Carbonate 4,63
Dolomite 3,70
Zinc oxide 19,44
Lithium Carbonate 7,41
China Clay 2,78
Quartz 33,34
Which computer recalculating/glaze development software du you clayarters recommend?
///Lissy
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Sabine Wolf on wed 12 mar 03
> Potash feldspar LR 28,70
> Barium Carbonate 4,63
> Dolomite 3,70
> Zinc oxide 19,44
> Lithium Carbonate 7,41
> China Clay 2,78
> Quartz 33,34
Let's take a 100g batch. 7,41g Lithium Carbonate are 0,1 mol LiO2. Pure
Petalit has the formula LiO2 Al2O3 8 SiO2 and the weight of 610 g/mol, so
you need 61 g pure Petalit to get 0,1 mol LiO2. But you get 0,8 mol SiO2
with a weight of 48 g and 0,1 mol Al2O3 with a weight of 10g, now you are
out of the game, 48g is much more than 33,34 g (real Petalit contains less
LiO2, so you get still more SiO2 for the same amount of LiO2). You could
take some SiO2 and Al2O3 from the feldspar and the clay, but it's not
practical to use soluble alkali salts as a SiO2 free replacement for the
feldspar.So I think it's not possible to replace the Lithium Carbonate with
Petalite.
Tschau,
Sabine
Craig Martell on wed 12 mar 03
Lissy wanted to sub petalite for Li2CO3
>Ok, sorry! It felt su urgent I pressed "send" before I had pasted in the
>recipe. Here goes:
>Potash feldspar LR 28,70
>Barium Carbonate 4,63
>Dolomite 3,70
>Zinc oxide 19,44
>Lithium Carbonate 7,41
>China Clay 2,78
>Quartz 33,34
>Which computer recalculating/glaze development software du you clayarters
>recommend?
Hi:
It's not possible to use Petalite as a replacement for lithium carb in this
glaze. You would need over 50% petalite to get the same molecular
contribution as you have with Li2CO3. When you add that much petalite the
alumina and silica values go way up and you have to totally delete the
china clay and silica from the glaze. Petalite is basically a lithium
feldspar and it has more silica than any of the other spars we use. The
ratio is about 8 moles of silica to 1 mole of flux.
Another problem with this glaze is that it's unbalanced and very low in
silica and alumina. I would recommend that it not be used for domestic
pots. The unbalanced nature adds to the problem of replacing the lithium
carb.
I use Insight and Matrix for glaze calc. They are both excellent.
regards, Craig Martell Hopewell, Oregon
Ababi on wed 12 mar 03
Hello Lissi
I could not find the analysis of Potash feldspar LR so I used the
Norwegian feldspar I use.
Sorry it is impossible. There is such a big amount of alumina that I find it
impossible to use in this very low alumina recipe
LISSY'S GLAZE
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Cone 6 1222 deg.C. -
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
potash feldspar (Norfloat) 28.70
Barium Carbonate 4.63
Dolomite 3.70
zinc oxide 19.44
Lithium Carbonate 7.41
kaolin CC31 2.78
Quartz 33.34
,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,
Seger Weight%
KNO 0.108 3.77%
CaO 0.091 2.08%
MgO 0.035 0.59%
BaO 0.050 3.11%
ZnO 0.505 16.82%
Li2O 0.212 2.59%
Al2O3 0.131 5.47%
SiO2 2.665 65.56%
TiO2 Tr 0.00%
K2O 0.079 3.04%
Na2O 0.029 0.73%
Al:Si 20.31
Expan. 6.38
ST 363.97
----- Original Message -----
From: "Lissy DeLeer"
To:
Sent: Wednesday, March 12, 2003 11:45 AM
Subject: Re: Recalculating Lithium Carb. glaze for Petalite..?
> Ok, sorry! It felt su urgent I pressed "send" before I had pasted in the
recipe. Here goes:
>
> Potash feldspar LR 28,70
> Barium Carbonate 4,63
> Dolomite 3,70
> Zinc oxide 19,44
> Lithium Carbonate 7,41
> China Clay 2,78
> Quartz 33,34
>
> Which computer recalculating/glaze development software du you clayarters
recommend?
>
> ///Lissy
>
>
Lissy DeLeer on thu 13 mar 03
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>It's not possible to use Petalite as a replacement for lithium carb in
>this
>glaze. You would need over 50% petalite to get the same molecular
>contribution as you have with Li2CO3.
Ok. I will try to get hold of some Lithium Carb. Is there any form of it that is not poisonous or a health hazard?
>Another problem with this glaze is that it's unbalanced and very low in
>silica and alumina. I would recommend that it not be used for domestic
>pots. The unbalanced nature adds to the problem of replacing the lithium
>carb.
Yes, it's a crystal glaze not at all meant for functional ware. So it's OK!
>I use Insight and Matrix for glaze calc. They are both excellent.
The I will look into those. I need one that is simple to understand and one where you can put in a recipe and try to change the raw materials just as you did above.
Thank You all for helping me on this one...
/// Lissy
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Ababi on thu 13 mar 03
Top what cone / temperature you fire this crystal glaze?
I think if you would reduce alumina ( in the feldspar) you could reduce the lithium.
Ababi
Crystal glazes
^6
http://members4.clubphoto.com/ababi306910/894659/
See also Fara Shimbo's sites:http://crystalline-ceramics.info and
http://shimbopottery.com
---------- Original Message ----------
>>It's not possible to use Petalite as a replacement for lithium carb in
>>this
>>glaze. You would need over 50% petalite to get the same molecular
>>contribution as you have with Li2CO3.
>Ok. I will try to get hold of some Lithium Carb. Is there any form of it that is not
poisonous or a health
>hazard?
>>Another problem with this glaze is that it's unbalanced and very low in
>>silica and alumina. I would recommend that it not be used for domestic
>>pots. The unbalanced nature adds to the problem of replacing the lithium
>>carb.
>Yes, it's a crystal glaze not at all meant for functional ware. So it's OK!
>>I use Insight and Matrix for glaze calc. They are both excellent.
>The I will look into those. I need one that is simple to understand and one where you
can put in a recipe
>and try to change the raw materials just as you did above.
>Thank You all for helping me on this one...
>/// Lissy
>______________________________________________________________________________
>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.
Craig Martell on fri 14 mar 03
Lissy asked:
>Is there any form of it that is not poisonous or a health hazard?<
Hello Lissy:
As far as I know, Lithium carb is Lithium carb and probably varies a bit
depending on the manufacturer but it's usually about 40% Li2O and the
carbonate is lost on ignition.
There may be some pertinent discussion in the Archives about lithium
toxicity. I personally don't think it's that dangerous to a potter unless
you are manic-depressive and are taking lithium meds. Just don't breathe
the dust or ingest the lithium. I use lithiium carb in two of my glazes
and I'm careful when using it and I've had no problems. I'm sure others on
the list will have differing opinions and perhaps some will post their
thoughts.
good luck with your glaze, Craig Martell Hopewell, Oregon
David Hewitt on sat 15 mar 03
In message , Craig Martell writes
>Lissy asked:
>>Is there any form of it that is not poisonous or a health hazard?<
>
>Hello Lissy:
>
>As far as I know, Lithium carb is Lithium carb and probably varies a bit
>depending on the manufacturer but it's usually about 40% Li2O and the
>carbonate is lost on ignition.
>
>There may be some pertinent discussion in the Archives about lithium
>toxicity. I personally don't think it's that dangerous to a potter unless
>you are manic-depressive and are taking lithium meds. Just don't breathe
>the dust or ingest the lithium. I use lithiium carb in two of my glazes
>and I'm careful when using it and I've had no problems. I'm sure others on
>the list will have differing opinions and perhaps some will post their
>thoughts.
I agree with Craig's comments. I also use Lithium carbonate in some of
my glazes and do not consider it a problem. Just follow simple good
practice.
David
>
>good luck with your glaze, Craig Martell Hopewell, Oregon
--
David Hewitt
David Hewitt Pottery
7 Fairfield Road, Caerleon, Newport,
South Wales, NP18 3DQ.
Tel:- +44 (0) 1633 420647
Fax:- +44 (0) 870 1617274
Web:- http://www.dhpot.demon.co.uk
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