Abstract
According to A. S. T. M. D 2977-9, it is impossible to do maceral analysis of such fine coal as-200mesh 100 Percent. However, sometimes the maceral analysis of such fine coal should be done for example in the case of the transportation of slurried coal and Pelletizing of fine coal. For these reasons, the analytical method of coal petrography of such very fine coal was established by the application of high pressure (8, 000 psi) in the molding stage.
At the same time, it was found that the molding pressure affected the result of maceral analysis considerably.
It is mainly due to the malleability of soft components that soft components i. e., vitri-nite, exinite are overestimated in the application of high molding pressure.
As the index of the degree of anisotropy, (1-Rmin/Rmax.) ×100 would be proposed because of its superiority compared with bireflectance (Rmax-Rmin).
Also, it was verified that (1-Rmin/Rmax) ×100 was quite useful to detect the effect of carbonization conditions (heating rate, soaking time, maximum treating temp.) and Oxidation degree of coal, to the coke texture. The determination of the inerticity of low reflectance semifusinite which had been reported as quite unique maceral to be found especially in Western Canadian coal was tried.
