Earl Brunner on fri 17 jul 98
We have access to the tailings of a production facility that extracts
manganese dioxide from ore that is shipped from Africa. The tailings have the
following rough composition:
SiO2 15-40%
CaSo4-@H2O 15-40%
CaCO3 15-40%
FeSO4 5-20%
lesser elements:
Al 8%
Ba .7%
Co (cobalt) .8
Cu .2
K 2%
Mg .1%
and on down the list of Ceramic glaze chemicals. My question is, There is a
fair amount of sulfur in this mix, but almost everthing else is desirable.
What is the problem with sulfur? I have looked in all my books, and with the
exception of a couple of negative, but not specific, references nothing is
said. Is this stuff usable?
Specifically, what is the problem with sulfur in glaze composition? (there
are tons of this stuff) Earl Brunner
FRANK GAYDOS on sat 18 jul 98
Earl Brunner wrote:
>
> ----------------------------Original message
> What is the problem with sulfur?
Earl,
I believe as the sulfur is gassed off it will corrode everything,
including your lungs.
According to Lawrence and West in 'Ceramic Science for the potter',p162
"The gaseous sulfur oxides are very toxic.Both SO2and SO3 can produce
lung injury at small concentrations of 5 to 10 PPM. Each can combine
with water vapor to form acid aerosols which damage vegetation, metals
and fabrics. At concentrations of 5 PPM, SO2 is irritating to the eyes
and respiratory system."
I guess that explains why the goverment has been trying to remove sulfur
from the coal that the power companies use to generate electricity. Also
might explain why there are tons of it for you.:>)
Hope this helps.
Frank Gaydos
510 Gerritt St.
Philadelphia,Pa.19147-5821 USA
fgaydos@erols.com
BRUNNEREC@aol.com on tue 28 jul 98
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In a message dated 7/27/98 9:34:46 PM Pacific Daylight Time, ENJB writes:
<< Sulphur smells awful, like rotten eggs, when in liquid form. >>
Ah yes, the old rotten eggs in the sulfur smell! Actually, I knew that!
I have tested two batches that appear to have different compositions (one is
significantly darker than the other) as an oxide colorant on and under a white
colne 6 oxidation glaze and a transparent cone 6 oxidation glaze. In both
cases I got brown tones, some almost reddish, plum brown. Under one glaze the
glaze peeled/crawled away from the oxide mix underneath it. I will try some
in a cone 10 reduction firing next chance I get.
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