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The static stability of COW (Coal-Oil-Water Mixture), which is made by the disintegration of leashed coal agglomerates, is investigated. The static stability is evaluated by two methods, that is, the direct measurement of coal volume fraction in COW and the rod penetration test. When the static stability of COW is high, the difference of coal volume fraction between the upper section and the lower section of the storage column is small, and the 50% diameters of coal particles in both sections are almost equal in size. On the other hand, when the static stability of COW is low, the coal volume fraction becomes large in the lower section, and in contrast the water volume fraction becomes large in the upper section. It is found that the rod penetration test only shows whether the hardpack layer of coal particles is formed on the column bottom. An empirical equation, which represents the degree of the static stability of COW, is obtained.

Static Stability of Coal-Oil-Water Mixture Prepared by Disintegration of Deashed Coal Agglomerates.