| 摘要 |
PROBLEM TO BE SOLVED: To provide a screening method of coal ash capable of efficiently screening coal ash in which the content or elution amount of harmful substance is less with a simple method without being restricted by recovery means.SOLUTION: Density of coal ash is measured and the coal ash of which the density is smaller than a first threshold is screened as the coal ash which has the content or elution amount of harmful substance of predetermined amount or less. The harmful substance includes at least one kind selected from a group consisting of fluorine, arsenic, selenium, chromium and lead. Further, it is most preferable that a first threshold is 2.2 g/cm. Furthermore, it is preferable that particle size is jointly used and, when the density is 2.2 g/cmor less, a center particle size of the coal ash is set to 20 μm as one example of a second threshold, the coal ash having a particle size of the value or more may be screened as such a coal ash that the content or elution amount of the harmful substance is the predetermined amount or less.SELECTED DRAWING: None |
