| 摘要 |
PURPOSE:To provide the title material which has a uniform pore size and is improved in ventilation, water absorption, and fertilizer, water and oxygen retention by mixing coal ash with an organic binder and granulating the mixture, followed by firing. CONSTITUTION:The title material is prepared by mixing a coal ash having a particle size of 0.3-2mum with a solution or emulsion formed by dissolving or emulsifying 0.5-2% (in terms of solid content) of an organic binder (e.g. starch) in 10-15% of water based on the amount of the coal ash, granulating the mixture without applying pressure to obtain granules with a particle size 1-20mm, preferably 3-15mm, drying the granules ash required, heating the granules gradually to about 1,000 deg.C, firing the granules at the temperature for 2 hours, further firing them at about 1,300 deg.C for 2 hours, and allowing the resulting granules to cool to room temperature. |
