We have discussed in this report the relation between the petrographical components of Miike Coal and the friability of the cokes made from them.We have succeeded in showing it quantitatively in a triangular diagram, which has been made to fit Miike Coal, using different indexes from those used by Mackowsky in her diagram.For the purpose of showing the relation between the petrographical components of the Tertiary coals and the friability of the cokes made from them, we believe our diagrammatic system has more universality than hers, since, in the case of the Tertiary coal, one can not ignore the existence of exinite-durite which exerts the worst effect upon the friability of cokes.
In the latter half of the report we have discussed the possibility of separating petrographical coal components from each other, especially that of separating vitrite from exinite-durate.Though we failed to realize the anticipated result through the flotation method using the aqueous solution of amyl alcohol, we have succeeded in the separation of vitrite from exinite-durate through the centrifugal method using as its medium the aqueous solution of CaCl
2 whose special gravity is made 1.24.It has been proved by experiment as well as in theory that the coal washer, which avails itself of the difference in sedimentation rate of each coal particle in water, does not make such separation possible.
At the same time we realized the fact that the separation of FeSx in coal from CaCO
3 is possible through the flotation method.
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