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Almost pure silica for casting?

 
Posts: 54
Location: Paonia, Colorado, USA
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Could this be of use/work providing formula could be worked out?

https://geopolymerhouses.wordpress.com/tag/diatomaceous-earth/

...Barsoum now believes he has discovered the actual recipe used to construct the pyramids in Egypt.

Start with pool of water and then add:
Quicklime (widely available in stores, but you could make your own by heating limestone to 900 degrees C.)
Diatomaceous earth
Powdered/crushed limestone
Mix and wait a few days to allow water to evaporate

At this point the limestone ‘mud’ is placed in earthbags or wood forms. Dr. Barsoum says sand was not used because it does not dissolve and so it’s not part of the chemical ‘glue’ that binds the other materials together.

Instead of course we'd put the mud in forms for casting cores
 
Geoffrey Levens
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Location: Paonia, Colorado, USA
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Got excited and posted too soon. Looks like not this is making limestone which is not at all insulating.
 
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