[Stoves] Sequestering carbon -

Crispin Pemberton-Pigott crispinpigott at outlook.com
Wed May 6 14:32:19 MDT 2015

Dear Rolf

How about making the clay mix weaker and weaker until it lights well, then
see how strong it is.

Then if it is too weak, go back a bit and try to light it.  If it lights OK,
add a little more. This idea is to find out how much you have to add before
the ignition is an unpleasant experience.

If it turns out it is not possible to get a strong enough mix using clay
only, try adding something as well, such as waste green bananas, maybe
cooked, maybe mushed up.

An alternative is to add a coating around the outside only that lights

And lastly, there is in a source of clay some very hard pieces (really
small) that act like sand but are actually clay. You want that materials
liquefied.  The solution is to soak them for a while before mixing the clay.
You might even cook it - ask experts. When the clay is put into a mixer, for
example, it may have to sit for a long time to get water into the very
compressed, dried small pieces. If the clay is completely liquefied before
mixing, what you are doing already may work much better with less clay and
still be strong in the end, assuming that some of the material isn't really
helping you, but could.

Clay is often mixed in a pug mill and then stored for a long time
specifically to deal with this issue. Months. It is kept covered in plastic.
Later it is put through again to spread the ingredients around the whole
body (because clay is not necessarily homogeneous).

There was a guy making strong thin panels using a mixer and he found that
rust running the machine a lot longer made the panels stronger with no
change in the mix at all - just more time being spread around. 

I am very interested to hear of anything that works better. I know of a
group in South Africa that was making coal-dung briquettes and coal-clay
ones too, with about 25% clay. The holey coal briquettes made in Ulaanbaatar
were 1/3 clay and they used a special short holey ignition briquette to
light the first one. It is a TLUD stove with two or three (two models)
columns of briquettes in a single combustion chamber. It took a long time to
burn down about two feet.  Very low PM.


thanks to crispin and all,

yes, i have tried clay before and IT WORKS FINE BUT THESE BRIQUETTES ARE

I found it takes a well lit fire below or around them to get to the point
where the clay does not absorb all the energy.
Once burning, they work well but they give a lot of ash, true.

I live on an island in the Mediterranean, very touristic and with a high
demand for good bbq charcoal. 
So coal is out, not being available anyway. 
Pity the clay as a binder is not very practical, either. It is cheap and
works well as such.

I have tried ground,soaked and fermented straw. Not much good unless in high
quantities but than it gives smoke.

Must try hay, someone said it works far better.

More to come!


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