Good point! Perhaps I need to rethink this. In woody materials the carbonates will be formed as the cations are set free. But in char (as you point out) they likely formed during the process using oxygen and carbon from the wood. And perhaps the ash content (550 deg C with oxygen) is a true ash reading. Thanks.
This is a great group. Frank Frank Shields Control Laboratories, Inc. 42 Hangar Way Watsonville, CA 95076 (831) 724-5422 tel (831) 724-3188 fax [email protected] www.compostlab.com -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Thursday, October 27, 2011 1:06 AM To: Discussion of biomass cooking stoves Subject: Re: [Stoves] [biochar-production] Re: Stoves Digest, Vol 14,Issue 17 On Wednesday 26 October 2011 21:54:47 Frank Shields wrote: > Because we 'make' more ash when we > change the cations into carbonates (increasing weight) during the > process. More cations from vegetative matter the more the problem. And > this quantity of ash is not what we are spreading on the field. Also > the carbon trapped in the ash (as CO3) is not included in the fixed > carbon fraction - it should be because it comes from the organic carbon > in the raw sample. Just picking up on one small point in your post: I infer that you are saying as the sample is heated to higher temperatures in the "ashing" process, to drive off remaining volatiles, carbonates form. In fact I suspect these are also a feature of chars from gasifiers. I don't think this carbon can count as recalcitrant as it will be gassed off as CO2 in acid conditions. AJH _______________________________________________ Stoves mailing list to Send a Message to the list, use the email address [email protected] to UNSUBSCRIBE or Change your List Settings use the web page http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists .org for more Biomass Cooking Stoves, News and Information see our web site: http://www.bioenergylists.org/ _______________________________________________ Stoves mailing list to Send a Message to the list, use the email address [email protected] to UNSUBSCRIBE or Change your List Settings use the web page http://lists.bioenergylists.org/mailman/listinfo/stoves_lists.bioenergylists.org for more Biomass Cooking Stoves, News and Information see our web site: http://www.bioenergylists.org/
