Thermite melts sand into glass.
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Uploaded by gammacephei1 on Jul 28, 2011
A video of the Iron(II,III) Oxide thermite reaction. The reaction is considerably more hot than standard lab thermite, as magnetite (Fe3O4) is a crystalline complex that releases significantly more energy in reaction than standard rust.
In this video, the silicon dioxide used was collected from Siesta Key beach, a beach in Florida known for having sand composed almost entirely of pure quartz. In order to reduce the melting point of the sand, it was mixed with some Sodium Carbonate (the result of putting baking soda in the oven for a while). The greenish residue along the bottom of the pot in the last photograph is the lime glass
More description on my blog:
http://gammacephei.wordpress.com/
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Interesting. I was thinking about molding quartz lens for camera by this method. But where to find as much as possible pure silica?
sauroman1 4 months ago
@sauroman1 I'm not sure this is viable for making lenses-- the rather chaotic reaction would undoubtedly cause the glass to be non-uniform and brittle. Plus, you would likely get air bubbles in you glass that would degrade its quality.
Pure silicon dioxide can be purchased for cheap from ceramics dealers on eBay, although beach sand will work if it is the extremely white powdery kind.
gammacephei1 4 months ago