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In this paper is presented a study conducted to verify the possibility of using a prototype of fluid energy mill, based on the opposing jets principle, for the reduction to ultrafine size of a beneficiated coal, intended for energy production. The original counterflow jet mill used operate in closed circuit with a cyclone type separating chamber, producing fine powders with a definite top size. Many processing plants routinely use jet mills in the final stages of mineral treatment for the production of high qualit...