Characterisation of fly ash from fluidised bed combustors with regard to its utilisation and safe disposal
For materials which must be disposed of on dumps in quantities of many 100 000 t/a, it is indispensable to have an exact knowledge of their effects on the environment. Characterisation by means of laboratory short term tests is thought to be unsuited for reactive materials, e.g. residues from fluidised bed combustion (FBC). Therefore, different FBC-residues are investigated by laboratory tests and by practice orientated tests in large scale lysimeters. These lysimeters are described in detail. Using diagrams with specific freight over liquid-solid-ratio Q, it is possible to compare lysimeter and column tests with shaking and cascade shaking tests. These comparisons show that alkaline FBC residues which selfharden by building new minerals, e.g. ettringite, give up much lower freights of sulphate and other components in the large scale lysimeter test than in laboratory tests. Some of the leaching mechanisms are explained.
Bibliographic Reference: EUR 12734 EN (1990) 76 pp., MF, ECU 4
Record Number: 199010532 / Last updated on: 1994-12-01
Original language: en
Available languages: en