David Cuzick on tue 21 jul 98
I would like to give a little empirical observation on this salt, soda
subject.
Anyone
who has been around the two types of firings knows the billows of white
"smoke"
that are emitted from the salt kiln. If you have been in a chemistry lab you
also
know the smell of hydrochloric acid. That smell is most certainly coming from
the
salt kiln. The NaOH which has been, stated to come from the soda kiln would
also come from the salt kiln,(not empirical but deduced from the chemistry)
and each would be neutralized at least in part by their corresponding acids
HCl and carbonic acid (very weak compared to hydrochloric). It is clear that
there will be an excess of chloride ion in the salt firing, because much of
the Na will combine with the clay, post, shelves, bricks etc.to make the
desired glass. It would seem that the corrosive effects of even 1% HClat 2300F
would be great. Is that stated 1% HCl from all emitted gases? If so, that is
not too low as most of the gas would be water vapor and CO2 from the
combustion of the fuel. It seems to me that the detrimental environmental
effects
of the salt firing are still greater than that of the soda firing.
David Cuzick
San Diego ,CA
claycuzian@aol.com
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