Hank Murrow on tue 26 apr 05
On Apr 26, 2005, at 11:12 AM, Patrick Green wrote:
> Hello,
> I was wondering if one could replace petalite with
> spodumene. I understand that petalite has about twice
> as much silica as spodumene and that there is an extra
> oxygen atom on the silica strand, how much does that
> matter? And if replacement is possible I would have to
> supplement the silica some how. Would it be on a gm to
> gm basis with the spodumene or would i reduce the gms
> of spodumene and then match up?. Any help would be
> greatly appreciated.
Well Patrick, here are some comparative recipes for those materials:
Spodumene low melt FROM AMALGAMET OF CANADA;
MINED IN PERTH (Bag says TANCO)
Cost/lb: $1.20
Silica/Alumina ratio: 3.3:1
Equivalent Molecular Weight: 391.905
Molecular Formula of Spodumene low melt:
K20 0.013 Al2O3 1.050 SiO2 3.465
Na2O 0.019 P2O5 0.252 MnO2 0.001
Li2O 0.968
FeO 0.011
Spodumene Foote Mineral Co
Cost/lb: $.4925
Silica/Alumina ratio: 4.1:1
Equivalent Molecular Weight: 415.900
Molecular Formula of Spodumene:
K20 0.034 Al2O3 1.044 SiO2 4.327
Na2O 0.018 Fe2O3 0.019 LOI 0.133
CaO 0.022 P2O5 0.010
Li2O 0.925
Petalite Hamill and Gillespie, Inc.
Cost/lb: $0.704
Silica/Alumina ratio: 8.2:1
Equivalent Molecular Weight: 599.386
Molecular Formula of Petalite:
K20 0.019 Al2O3 0.952 SiO2 7.770
Na2O 0.039 Fe2O3 0.001 F 0.005
CaO 0.011 LOI 0.118
MgO 0.060
Li2O 0.870
As you say, use a spodumene and add in some silica. If you give me a
recipe, I can run it through my HyperGlaze program and give you a
calculated answer. I like the Low Melt Spodumene for its Phosphorus
content, which helps the iron reds.
Cheers, Hank
Patrick Green on tue 26 apr 05
Hello,
I was wondering if one could replace petalite with
spodumene. I understand that petalite has about twice
as much silica as spodumene and that there is an extra
oxygen atom on the silica strand, how much does that
matter? And if replacement is possible I would have to
supplement the silica some how. Would it be on a gm to
gm basis with the spodumene or would i reduce the gms
of spodumene and then match up?. Any help would be
greatly appreciated.
sicerely
-Patrick
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Daniel Semler on wed 27 apr 05
Hi Patrick,
This turned out to be fun.
Without the glaze its hard to see what else I might be trading off but from
the analyses I have, it looks like a sub could be made for petalite like this :
Australian spod 1.0
EPK 0.64
silica 0.1
for every 1.0 of petalite.
This will slightly shift the Li2O balance and reduce KNaO. It will bring in
some other trace stuff, but it could be worth a shot.
With the recipe I might be able to play more but this may well be enough on
its own. If you want me to take a look feel free to shoot me the recipe
offline.
Thanx
D
> Hello,
> I was wondering if one could replace petalite with
> spodumene. I understand that petalite has about twice
> as much silica as spodumene and that there is an extra
> oxygen atom on the silica strand, how much does that
> matter? And if replacement is possible I would have to
> supplement the silica some how. Would it be on a gm to
> gm basis with the spodumene or would i reduce the gms
> of spodumene and then match up?. Any help would be
> greatly appreciated.
>
> sicerely
> -Patrick
>
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Eleanora Eden on sat 30 apr 05
Hi Patrick and all,
Digitalfire says :
A substitute for petalite can be made from 25% feldspar and 75%
spodumene. Also:
Spodumene is a little more readily fusible than petalite since it is
higher in lithium.
I tried it and it works.
Eleanora
>Hello,
> I was wondering if one could replace petalite with
>spodumene. I understand that petalite has about twice
>as much silica as spodumene and that there is an extra
>oxygen atom on the silica strand, how much does that
>matter? And if replacement is possible I would have to
>supplement the silica some how. Would it be on a gm to
>gm basis with the spodumene or would i reduce the gms
>of spodumene and then match up?. Any help would be
>greatly appreciated.
>
>sicerely
>-Patrick
>
>__________________________________________________
>Do You Yahoo!?
>Tired of spam? Yahoo! Mail has the best spam protection around
>http://mail.yahoo.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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