| 摘要 |
A process for producing a high-concentration coal/water mixture fuel, whereby a coal/water mixture fuel having a good fluidity even at a high concentration is produced from a dry-pulverized fine coal at a low cost with a reduced amount of the dispersant used. The process comprises mixing a fine coal pulverized so as to have a given particle diameter distribution with water and a dispersant, while adding a hydrophilic colloid having a protective effect to the fine coal preferably before the addition of the dispersant, thus giving a high-concentration coal/water mixture fuel, such as CWM, containing the hydrophilic colloid and being reduced in the amount of the surfactant used. The amount of the hydrophilic colloid to be added is less than 1 wt.% based on the CWM as a whole and an amount exceeding the one that causes mutual coagulation between the colloid and the coal, preferably of the order of ppm or ppT. The fine coal is rounded by rubbing the coals with each other before the production of CWM, whereby the fine coal is graulated without causing an extreme reduction in the initial grain diameter and coal grains are very finely pulverized to have a desirable grain diameter distribution as the CWM.
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