| 摘要 |
<p>PURPOSE: To obtain a porous block structural body useful as a material for creating the biological environment of the waterside to promote natural water cleanup action, by baking and mutually binding granules consisting of material mainly comprising allophane. CONSTITUTION: First, water is added to a stock mainly comprising allophane, ejecta or burned ash, such as Kanuma soil (a brown wet granular soil produced Kanuma district in Japan), so as to have 20-30wt.% water content in the mixture and, as necessary, further incorporated with <=30 pts.wt., based on 100 pts.wt. of the stock, of an inorganic binder such as kaolin or clay, and the resultant mixture is granulated into granules having 2-70mm longer size where the size is selected according to use. Subsequently, the granules are filled in a mold produced by baking a stock consisting mainly of alumina and silica and dried at 100-200 deg.C for 1-3h, and then baked at 800-1400 deg.C for 0.5-4.0h, thus obtaining the objective porous structural body wherein the granules are mutually bound by fusing and continuous open cells are formed.</p> |
