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Authors, continuously from 3rd and 4th reports, have made clear up the effects of surfactants in O.A. method.<BR>Especially in this report, they have discussed the relative merits of surfactant addition test in comparison with blank test, considering the relation between ash of clean coal by O.A. method, to be exact, ash of de-oil pellet and several factors, for example quantity of surfactant (Fig. 1), one of binder oil (Fig. 2) and mean size of the coal (Fig. 3).<BR>Besides, as the pre-treatment method of O.A. one, they have brought forward and discussed the usage of alkali in order to improve de-ash efficiency (Fig. 4-Fig. 7).
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