| 摘要 |
<p>Provided is a method for purifying fly ash by reducing carbon contents in fly ash through hot blast sintering or rotary kiln sintering. Fly ash used as cement admixture is purified by sintering fly ash having 3500-4300cm2/g of surface area, generated from cogeneration plants or paper plants, at 500-900deg.C for 3-25sec in hot blast furnace or at 500-700deg.C for 5-20min in rotary kiln, wherein the fly ash is optionally classified before sintering. The carbon contents in fly ash is less than 5% after sintering.</p> |
