Wet Oxidizability of Carbonized Specimens Prepared from Petrographic Constituents of Coals

概要

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In order to study the properties of petrographic constituents on Japanese coals, the wet oxidations were carried out on the carbonized specimens prepared from various kinds of petrographic constituents of coals over the range from brown coal to coking coal, such as Joban, Mitsui-Bibai, Akabira, Oyubari, Yatake. Samples were obtained by the following methods; The coal specimens were pulverized to pass through a 30 Tyler mesh sieve, and separated into some fractions in specific gravity between 1.25-4.50 by the float-and-sink method using mixtures of benzene and carbon tetrachloride.Then, these specimens were carbonized at 1, 000°C, and were repulverized to pass through a 200 and stand a 300 Tyler mesh sieve. The wet oxidation of these specimens were carried out in the phosphoric acid solution of potassium dichromate, and their reactivities were compared by measuring the volume of carbon dioxide evolved as a function of time. In the results of petrographic analysis, the contents of vitrite decreased and mineral-durite increased, as the specific gravity of the fraction increased. The reactivity of carbonized specimen depended upon the content of mineral-durite, since the more mineral-durite showed the higher reactivities. Other than the results mentioned above, no correlations could be observed between the petrographic constituents of coals and their reactivities of carbonized specimens.
一般社団法人日本エネルギー学会の論文