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Re: Calcium Fluoride Sludge Use
For the wastewater treatment, don't try sodium or potassium. Neither
of these will precipitate fluoride. From my experience calcium is the
best treatment choice for fluoride.
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Subject: Calcium Fluoride Sludge Use
Author: email@example.com at INTERNET
Date: 2/7/97 7:03 AM
FROM: R. Illig
RE: Calcium Fluoride Sludge and
Hydrofluoric Acid for Etching Glass
One and All,
1) I too would be very interested in alternate uses, or users,
for calcium fluoride sludge...pending full analysis of the sludge
of course. I have a site visit coming up next week and that is
one of the waste streams needing addressed.
I request that anyone answering the earlier request for
information on CaF copy me and/or post the response to the list.
2) About a month ago, I requested information on any known
methods for etching glass that would avoid the use of hydrofluoric
acid (a better means for eliminating generation of the calcium
fluoride sludge). Unfortunately, the best, and only, response I
received was not applicable, and involved the use of abrasive
material. I'm rather sure a chemical etching process would be
needed (the inside of a glass (light) bulb is the object needing
Assumming I'm stuck with the hydrofluoric acid for etching, my
next thought was to study the waste treatment system. A
significant drop in the molecular weight of the sludge MAY be
possible by looking for replacements for the calcium source.
Sodium, potassium, or other lighter elements that have similar
chemical properties may allow for substitution of the calcium
material. Am I dreaming (about dead chickens) or does this seem
like a worthy P2 method for attacking the problem?
As usual, thank you for any consideration.