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Alternative uses for grinding sludge



Hello,

I have a question concerning possible uses for grinding sludge. The sludge is 
composed of 80% silicon carbide and 20% iron. Right now the sludge is diposed 
of as special waste. I was curious if the sludge could be used as a filler 
even though it contains metal? Any info would be greatly appreciated. Thanks 
in advance.

Kevin