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Re: Raw material substitution in glass

Fred,
Not sure I understand what the client wants to do because potash is a potassium silicate. Potash is KAlSi3O8-potassium (-alumino) silicate. My ol' mineralogy book says that the aluminum is important in the manufacture of glass, as a constituent of the glass itself. So all that's left is the K and the Si3O8. Don't see any carbonate in potash per se, but maybe it's a question of the quality of the source of the potash-maybe the deposit they mine from happens to have alot of carbonaceous matter in it. In any case, sorry I have no info on the use/effects of purer potash in glass manufacture. But also, in case it's helpful at all, it appears that KAlSi3O8 melts around 1550 C, so it seems kind of hard to believe that would be much lower than the temp. necessary to drive off the carbonate (?).
Judy Jordan
Delaware Manufacturing Alliance
judy.jordan@fc.dtp.newark.de.us
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