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fire brick heat riser question 2

 
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It looks like I might not have enough fire brick, that was salvaged of of an old kiln, to make the whole heat riser (I can get about a 24" stack), would the brick be a good material to grind up and use in a mix to cast a heat riser?

thanks
Alan
 
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Location: Southern alps, on the French side of the french /italian border 5000ft elevation
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https://en.wikipedia.org/wiki/Grog_(clay)
 
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