古河鉱業炭の風化試験

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This paper reports the variations of coal properties during the weathering about 6 coals of Furukawa Mining Co. L. T. D. (1) Young coals are able to crush to powder than old ones. (2) Young coals absorb much more quantities of oxygen. But in the other hand, they decrease their moisture contents greatly than old ones. Then calorific values of old Ones appear much more decrease than young ones. (3) Weathering in the period of spring, summer, autumn and winter variate the coal properties much more than the autumn, winter, spring and summer. During the period of autumn and winter, the surfaces of coals are covered the oxydation films, then these films appear to protect from the interior oxydation. (4) Oxydation of coals is belong to the exterior oxydation and the interior one. The one proceeds urgently in the short period, increases the moisture contents and repeats its occuring and disappearing. But the other oxydates the interior parts of coals and then it does not variate the moisture
茨城大学工学部の論文