| 摘要 |
PURPOSE:To obtain a filter assistant consisting of a porous material wherein many holes are present by adding lime of the specified amount to the coal ashes, mixing the mixture and performing the hydrothermal reaction in an autoclave. CONSTITUTION:10-40pts.wt. is added to 100pts.wt. coal ashes and the mixture is mixed by adding water and the stirred slurry is heated in an autoclave to perform the hydrothermal reaction. Still more in this case, gypsum may be added to accelerate the reaction. A porous material wherein the many fine holes are present as shown in a figure is obtained by filtering, dehydrating and drying the obtained slurry of calcium silicate hydrate. The coal ashes to be used is preferably calcined at about 600 deg.C to remove the nonburned carbon as the pretreatment and furthermore it is more preferable that the degree of crystallization of coal ashes is increased by calcining them at about 1,000 deg.C. By such a method, the filter assistant exhibiting the same characteristics as diatom earth or above is obtained out of the coal ashes produced in great quantities.
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