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<DIV><FONT size=2 face=Arial>Xavier</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>Jon anderson and wife Flip been making making
many self firing clay /organic mixes --adding some form of potassium
salts to a bout 50-50 volume mix of clay organic. they have
got potash water from leaching wood ashes. Horse dung with urine
also seems to work well. If you increase the draft temporarily with a chimney
extension and fire hard for several hours. the stove becomes a miniture kiln and
vitrifys the inner linning to brick. The potassium appears to act as a flux to
lower the temperature at which the clay will vitrify. I think others on
the stove list (Crispin?) have made similar suggestions It looks very
promising Check what Jon and flip have posted</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>God Bless</FONT></DIV>
<DIV><FONT size=2 face=Arial></FONT> </DIV>
<DIV><FONT size=2 face=Arial>Larry</FONT></DIV>
<BLOCKQUOTE
style="BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: black"><B>From:</B>
<A title=xvr.brandao@gmail.com href="mailto:xvr.brandao@gmail.com">Xavier
Brandao</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=stoves@lists.bioenergylists.org
href="mailto:stoves@lists.bioenergylists.org">stoves@lists.bioenergylists.org</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, August 08, 2011 3:07
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [Stoves] A heat-resistant
insulation mix</DIV>
<DIV><BR></DIV>
<DIV class=Section1>
<P class=MsoNormal><SPAN lang=EN-US>Stovers,<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US>I wanted to submit another question
related to the institutional rocket stoves (IRS).<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US>We encountered a problem with the
insulation mix we used. In Benin, there are only a few oven to produce
ceramics. They are already used for bricks and NANSU (kind of Jiko) ceramics.
Demand for NANSU ceramics is huge from metal craftmen. So big that one of them
grew tired to wait, and made his own ceramics, with a simple wood fire. It is
of poor quality, and it breaks easily. Since this option and building our own
oven was not possible (too expensive and we are not ceramists), we needed to
find an insulation which didn’t need to be cooked. That is also why we want a
metal domestic charcoal stove.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US>So we followed a recipee described in the
IRS manual. Between the inox combustion chamber and the sheet metal outer body
of the stove, we used a mix of 6 parts wood saw dust and 1 part of clay. On
the stoves we made in the military camp (where they prepare from dawn till
dusk), the mix almost completely burnt after a few weeks of use, leaving only
a thin powder at the bottom of the space between the inox and sheet metal
layer.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US>We don’t have anything to analyse it, but
we are pretty sure the powder pile at the bottom is clay powder, the same clay
powder we put in the mix. The sawdust burnt because of the heat. Small smoke
was coming out of the small holes in the outer layer of the stove when in
operation, certainly because the sawdust was burning. We thought that was the
plan : the sawdust would burn and leave holes in the mix, making a kind of
insulative ceramic. The strange thing is that it didn’t burn like that in the
two first stoves we made. At least not that we know.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US>Maybe is it because we then used water to
mix the sawdust to the clay? The mix clay-sawdust for the camp stoves was
dry.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US>Or perhaps with such a thin layer of inox
(1mm), the sawdust is meant to burn completely, and 6 parts is too much for 1
part of clay. At one point or another, the only thing left would be a pile of
clay.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US>We are thinking about different things. We
need to do without ceramics.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US>For the next stoves we’d like to replace
inox layer + insulative mix by bricks. It will be less expensive. We want to
try to cut standard size clay bricks to the size of our combustion chamber (it
seems bold) and put them in the sheet metal box. Then to bind them with
something strong. And perhaps had an extra layer of cement + clay, I think
this is what you recommended Crispin, to prevent users from breaking the
bricks when pushing the wood. We need something heat and shock resistant,
long-lasting, efficient and cheap, and that seems like the best
solution.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US>As for the stoves left empty, it seems
that the cooks don’t complain. Somehow, they are still efficient and clean.
Air is also in insulator. But we need to refill them. We think to avoid using
sawdust, and put a mix of clay + cement + water.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US>Do you think that would resist heat and
last? What are your experiences of making insulative layer, without the help
of ceramics? And with cheap and wide-spread material? Rock-wool for example is
too expensive and too rare. People here advise us to use laterite. It is cheap
and to be found everywhere, heat and shock resistant. Metal workers use
laterite bricks for furnaces. But I doubt about the energy efficiency,
compared to clay.<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US>Thanks in advance,<o:p></o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US><o:p> </o:p></SPAN></P>
<P class=MsoNormal><SPAN lang=EN-US>Xavier<o:p></o:p></SPAN></P></DIV>
<P>
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