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Ch. 7: Boart, Carbonado, & Graphite

Ch. 7: Boart, Carbonado, & Graphite Page of 171 Ch. 7: Boart, Carbonado, & Graphite Text size:minus plus Restore normal size   Mail page  Print this page
GRAPHITE
to which it has previously been exposed. Graphites which are easily attacked by a mixture of fuming nitric acid and potassium chlorate are rendered more resistant by strong heat in the electric furnace.
I have already signified that there are various degrees of refractoriness to chemical reagents among the different forms of graphite. Some dissolve in strong nitric acid'; other forms of graphite require a mixture of highly concentrated nitric acid and potassium chlorate to attack them, and even with this intensely powerful agent some graphites resist longer than others. M. Moissan has shown that the power of resistance to nitric acid and potassium chlorate is in proportion to the temperature at which the graphite was formed, and with tolerable certainty we can estimate this temperature by the resistance of the specimen of graphite to this reagent.
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Ch. 7: Boart, Carbonado, & Graphite Page of 171 Ch. 7: Boart, Carbonado, & Graphite
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