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متالوژی::
قلیا
Alkalis are deleterious.
Moreover, alkalis have fluxing property and they get into the raw material mix through the feldspar and soda.
Alkalis and lime lower the fusion temperature, and hence are deleterious.
Fireclay is made up mainly of kaolinite mixed with crude vegetable matter, pyrites, lime, magnesia, alkalis, titanium and ferric oxide, and it has widely varying colours - white, grey, brown, black.
attapulgite as found in nature contains varying amounts of calcium, alkalis and iron.
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