| 摘要 |
<p>PURPOSE:To provide a method improved in removing efficiency and shortened in treatment time, so designed that, in the first leaching process, a specified proportion of an organic solvent is added to washing water to help penetrate the washing water into the ceramic form followed by raising temperature using a 1% washing aqueous solution of ammonium chloride. CONSTITUTION:Firstly, and expandable porous ceramic form is produced by casting in a mold a mixture of aluminate slurry and silicate slurry. The silicate slurry comprises sodium silicate, fine ceramic powder, ceramic fibers, silica fume, surfactant, aluminum powder and ion-exchanged water; while, the aluminate slurry comprises sodium aluminate, fine ceramic powder, ceramic fibers, ion-exchanged water, etc. In the first leaching process for the above ceramic form, 5-50wt.% of an organic solvent is added to the ion-exchanged water; and in the second leaching process, a 1% washing aqueous solution of ammonium chloride is used; in this case, the temperature is raised from room temperature up to 80 deg.C to further improve the leaching efficiency.</p> |
