| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a grinding aid for coal, which can allow the grinding efficiency of coal to be improved drastically and can contribute to further improvement of the combustion efficiency of a pulverized coal-fired boiler and to provide a method for using the grinding aid. Ž<P>SOLUTION: The grinding aid contains fine silica (SiO<SB>2</SB>) having 4 nm to 20 μm average particle diameter, is preferably colloidal silica containing 1-50 mass% silica having 4-200 nm average particle diameter or is further preferably the colloidal silica which contains 1-50 mass% silica having 4-200 nm average particle diameter and to which a Li compound or the like is added. When coal is pulverized, the grinding aid is added to be 0.1-2.0 mass% in terms of SiO<SB>2</SB>. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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