[Stoves] Coral filler for bricks

[IanVB]

Hi,

I am new to this list and am interested in rocket stoves for use in drying 
Kava, here in Fiji.

I am looking at ways to make ceramic doughnuts using local materials.

The island I live on, Taveuni, is volcanic so we have supply of scoria, 
pumice(rare), and coral sand of various grades. We need to source clay from 
another island since we have none here.

We came to consider wether or not coral sand would decompose on firing and 
produce the air spaces. I suspect that it would but thought I would write 
to see if anyone monitoring this list has any comment.

I also want to use coral for insulation of the elbow too and hope that it 
does decompose and can be replaced with fresh from time to time. The 
heated/burtnt coral becomes slaked lime I think, so could be useful in 
agriculture. Not sure of the chemistry.

Any comments appreciated


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