Tom Buck on wed 26 feb 03
Donald Sauch, who knows how to add better than I do, sent me a couple of
corrections to my bit on Spodumene ...see below.
at 2 am my math skills drop off noticeably, and since I tend to
write online onscreen and post immediately, errors do happen. His
mole weight for Li2CO3 is correct (I omitted one Li atom). and I cited
the Spodumene model from memory, assumed that it was like K and Na
feldspar, 1:1:6, whereas it is similar to Nepheline Syenite, 1:1:4.
Donald provides info on a Canadian supplier of Spodumene that
is helpful. He also gives the revised substitution values for Spodumene
Please adjust my post accordingly.
later. Peace. Tom B.
Tom Buck ) -- primary address.
"alias" or secondary address.
tel: 905-389-2339 (westend Lake Ontario, province of Ontario, Canada).
mailing address: 373 East 43rd Street, Hamilton ON L8T 3E1 Canada
---------- Forwarded message ----------
Date: Wed, 26 Feb 2003 13:19:41 -0600
From: Donald Sauch
To: Tom Buck
Subject: Re: Spodumene?
Dear Tom,
Always good to see someone take the initiative to explain things to the
novices. However, it looks like a couple errors crept into your post. The
molecular formula of ideal spodumene is 1 mole Li2O + 1 mole Al2O3 + 4(not
6) moles of silica. The molecular weights you cite for Li2O and Li2O-CO3
are incorrect.
Li has an at. wt. of 6.9 and oxygen 16 therefore Li2O has a mol. wt. of
about 29.8g/mole. Carbon's at. wt. is 12 therefore the mol. wt. of CO2 is
about 44g/mole. Lithium carbonate then has a mol. wt. of about 73.8g/mole.
Hence:
SPODUMENE....100.0% is equivalent to
LITHIUM CARBONATE... 15.5% by weight
EPK KAOLIN.......... 57.3%
SILICA.............. 27.2%
100.0%
This of course ignores the LOI and Na/K/Ca/Mg/ etc. in real spodumene,
but for highly processed brands, like TANCO from Canada, it is close. I
don't have any connection with TANCO, financial or otherwise, but have used
their spodumene for glazes and had excellent results.
I posted to you directly, as you may wish to be the one to post a
corrected version of your original to the list.
Best regards, Don (a lurker)
"If, at first, you don't succeed, ........ "
Been there, done that too.
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