Dustin Harris on wed 24 jan 07
i was going to line my firebox and floor of my soda kiln with super-duty
firebrick thinking it would hold up better to the heat and soda. but pam
at larkin refractory told me that the super duty does worse when it comes
to salt and soda because of the porosity of the bricks. does anyone have
an opinion about this or used super or high duty bricks in there salt/soda
kiln?
Vince Pitelka on wed 24 jan 07
>i was going to line my firebox and floor of my soda kiln with super-duty
> firebrick thinking it would hold up better to the heat and soda. but pam
> at larkin refractory told me that the super duty does worse when it comes
> to salt and soda because of the porosity of the bricks. does anyone have
> an opinion about this or used super or high duty bricks in there salt/soda
> kiln?
Dustin -
The super-duty bricks from Larkin are holding up fine in our soda kiln, but
a bagwall made from them in our salt kiln collapsed when the bottom bricks
melted, due to salt absorption no doubt.
- Vince
Vince Pitelka
Appalachian Center for Craft, Tennessee Technological University
Smithville TN 37166, 615/597-6801 x111
vpitelka@dtccom.net, wpitelka@tntech.edu
http://iweb.tntech.edu/wpitelka/
http://www.tntech.edu/craftcenter/
Hank Murrow on wed 24 jan 07
On Jan 24, 2007, at 12:00 PM, Dustin Harris wrote:
> i was going to line my firebox and floor of my soda kiln with
> super-duty
> firebrick thinking it would hold up better to the heat and soda. but
> pam
> at larkin refractory told me that the super duty does worse when it
> comes
> to salt and soda because of the porosity of the bricks. does anyone
> have
> an opinion about this or used super or high duty bricks in there
> salt/soda
> kiln?
Dustin;
No, but I have a solution for you that has proven very effective in the
dozen or so kilns I have tried it in. Make a mold and cast a reservoir
of Greencast 94 or other equivalent to 'hold' the molten salt while it
vaporizes. I have made such reservoirs about an inch thick with sides
that are an inch higer around the periphery. these replaceable cast
reservoirs lined each firebox with a ceramic fiber paper (1/8" thick)
as a gasket so that they could be removed easily if replacement were
ever needed. I cast extra reservoirs from the mold so replacements
would be on hand. Amazingly, the reservoirs lasted as long as the kiln
itself. I used the backups as prime parts in the next kiln. The main
thing is to protect the brick joints from having the molten sodium seep
down in to them. the sodium gradually pushes the bricks apart until the
floor fails. With these reservoirs in place, the kiln maintains its
integrity. Simple. if you want to increase the vaporization rate, stand
up some super duty 'soaps' to act as wicks for the molten sodium.
Cheers, Hank in Eugene..... enjoying the sweet few racers I got out of
the first firing of Tom Rohr's new anagama. Co-Shigaraki clay from
Mashiko Rules!
www.murrow.biz/hank
Lee Love on thu 25 jan 07
On 1/25/07, Dustin Harris wrote:
> to salt and soda because of the porosity of the bricks. does anyone have
> an opinion about this or used super or high duty bricks in there salt/soda
> kiln?
I have them in my wood kiln and have introduce soda from time to
time, in different ways. Most of my kiln's interior is what I
suppose you'd call super duty soft brick but some of the arch are
regular high duty (I have a third kind which are only used for the
outside of a high fire kiln. I used these for the angle where the
arch meets the walls.) While the supers are more resistant than
high duty, they don't compare in any way to hard brick.
What I might do in Mpls, is build a similar 2 layer wall
design as my kiln, but put the hardbrick on the inside and the
softbrick on the outside.
--
Lee in Mashiko, Japan
Minneapolis, Minnesota USA
http://potters.blogspot.com/
"Let the beauty we love be what we do." - Rumi
"When we all do better. We ALL do better." -Paul Wellstone
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