[Stoves] Tom Miles / cristobalite discussion

[Tom Miles]

I'll check. We are redoing the archives. 

Basically cristobalite forms at very high temperatures that are not usually
reached in pyrolysis and gasification. Cristobalite usually forms in very
high temperature combustion of rice husks. Combustion conditions can be
adjusted to avoid  the high temperature peaks. More than 100,00 tons of rice
husk ash is generated in boilers in the US with no substantial cristobalite
formation. ( Other properties of rice husk ash can make it a hazardous
material according to department of transportation. ) Cristobalite was found
in rice husk ash in Australia from an updraft gasifier that has a very high
temperature oxidation zone. I don't think it has been found in appreciable
quantities in TLUD ash. It is not likely that TLUD ash has been tested for
cristobalite silica but others may know more about that.      

Thanks

Tom

-----Original Message-----
From: Stoves [mailto:stoves-bounces at lists.bioenergylists.org] On Behalf Of
revjcsd at juno.com
Sent: Thursday, February 20, 2014 12:12 AM
To: stoves at lists.bioenergylists.org
Subject: [Stoves] Tom Miles / cristobalite discussion


Tom,

You wrote:

14 Jun 2013 07:50:23 -0700

We have had the cristobalite discussion before but it must have been on the
biochar list.

+++++++++++++

How do I access that discussion?

Thanks

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