Hank Murrow on thu 25 oct 01
>Hi all:
> I just sent Hank Murrow some samples of the veneering system I am
>working on for salt and wood kilns. Basically, the idea is this: we line
>the inside of the kiln with very thin high alumina inverted "J" shaped
>tile that hang on cutouts in the face of our insulating firebrick shell.
>The veneer will be designed to be easily replaced as it corrodes or builds
>up deposits.
> Then we back the IFB shell with a few inches of refractory fiber. My
>tests have shown that even 2" ( 50.8 mm) of 6 lb density fiber refractory
>on the outside of ordinary insulating firebrick will lower the surface
>temperature of the kiln hundreds of degrees and substantially reduce
>firing times. Better yet, when we construct an outer shell of stainless
>steel, that shell can be pressurized slightly to create a small but
>constant air flow which should prevent the infiltration and destruction of
>the refractory shell by the corrosive effects of sodium. No need for ITC
>(sorry Mel).
> Also, Hank will shortly have in his possession 10 lbs of the Moose
>Creek high potash feldspar for experiments. I compared its performance to
>Kingman (remember Kingman? I still have some) and found it to be the equal.
> Finally, Hank has samples of the insulating firebrick mixture I use to
>make the very large scale monolithic firebrick components for our flash
>calciner. The mixture can be rammed into shapes, allowed to dry and fired.
>Once fired, it weighs about 2.5 lbs per standard 2.5" X 4.5" X 9"
>insulating firebrick. This is heavier than the IFBs used in electrics but
>lighter than the K-26 brick I used for comparison. Thermal characteristics
>are similar to G-26 (A.P. Green brand) IFBs, but you can make bricks as
>large as you can fire in your kiln and don't need to mortar a bunch of
>pieces together. Instead, you build a ramming mold for the desired shape
>and hand ram the component.
> I am currently working on a hydraulic press to allow me to make custom
>shapes more quickly and with higher uniformity. When ready, I will update
>with results.
>Regards,
>Michael Wendt wendtpot@lewiston.com
So, when Mel arrives with Nils we're gonna put them both to work testing
this stuff. So rest assured, Clayarters, your Mayor and his Deputy will
have a working holiday for sure!
Cheers, Hank
Michael Wendt on thu 25 oct 01
Hi all:
I just sent Hank Murrow some samples of the veneering system I am =
working on for salt and wood kilns. Basically, the idea is this: we line =
the inside of the kiln with very thin high alumina inverted "J" shaped =
tile that hang on cutouts in the face of our insulating firebrick shell. =
The veneer will be designed to be easily replaced as it corrodes or =
builds up deposits.
Then we back the IFB shell with a few inches of refractory fiber. =
My tests have shown that even 2" ( 50.8 mm) of 6 lb density fiber =
refractory on the outside of ordinary insulating firebrick will lower =
the surface temperature of the kiln hundreds of degrees and =
substantially reduce firing times. Better yet, when we construct an =
outer shell of stainless steel, that shell can be pressurized slightly =
to create a small but constant air flow which should prevent the =
infiltration and destruction of the refractory shell by the corrosive =
effects of sodium. No need for ITC (sorry Mel).
Also, Hank will shortly have in his possession 10 lbs of the Moose =
Creek high potash feldspar for experiments. I compared its performance =
to Kingman (remember Kingman? I still have some) and found it to be the =
equal.
Finally, Hank has samples of the insulating firebrick mixture I use =
to make the very large scale monolithic firebrick components for our =
flash calciner. The mixture can be rammed into shapes, allowed to dry =
and fired. Once fired, it weighs about 2.5 lbs per standard 2.5" X 4.5" =
X 9" insulating firebrick. This is heavier than the IFBs used in =
electrics but lighter than the K-26 brick I used for comparison. Thermal =
characteristics are similar to G-26 (A.P. Green brand) IFBs, but you can =
make bricks as large as you can fire in your kiln and don't need to =
mortar a bunch of pieces together. Instead, you build a ramming mold for =
the desired shape and hand ram the component.
I am currently working on a hydraulic press to allow me to make =
custom shapes more quickly and with higher uniformity. When ready, I =
will update with results.
Regards,
Michael Wendt wendtpot@lewiston.com
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