Abstract
The main substances of this paper are summarised as follows.1. In an attempt to quantify the wettability of coal, the following two measuring methods were proposed, and the effectiveness of measured values of them were substantiated by a test.(1) Contact angle measuring method using molded pulverized coal(2) Dynamic wettability measuring method to utilize the capillarity in columnar pulverized coal2. The relationship between the wettability measured values by the above-mentioned measuring methods and coal properties is discussed and concludes as follows.(1) First, the coal wettability is greatly regulated by the ash content. To be more specific, coal is more hydrophilic the higher the ash content is.(2) In the wettability of coal organic substances, the direction in which the ox-ygen content ratio increases, particularly the direction in which functional group containing oxygen increases, is hydrophilic direction.
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