PRODUCTION OF COAL ASH-CONTAINING CURABLE MIXTURE AND CURED COAL ASH-CONTAINING GRANULE AND COAL ASH-CONTAINING BUILDING MEMBER

摘要

Described is the process for forming a hardenable mixture of a coal ash comprising free CaO and free CaSO4.0 H2O. In order to remove all free CaO the coal ash is mixed with a fly-ash comprising essentially no free CaO and no free CaSO4.0 H2O and water and subsequently subjected to a heat treatment. By removal of free CaO it is found that the strength of hardened granules formed from such ash mixture does not deteriorate as is the case form granules formed with a coal ash comprising free CaO. Also a process for forming hardened granules and a building component formed with use of a hardenable mixture according to the invention are described.