Investigating the Mineralogical Composition of Flying Ash Pulps from the Aspect of Waste Quality

Nowadays coal-based power plants have still a 25% share in energy production in Hungary. Consequently, professional treatment of the yearly accumulating large volumes of ash/flying ash is an important task from environmental, as well as national economic aspects. Since power plants have gradually switched during the recent years to hybrid-fluid technology, substantial part of sulphur accumulates in fine ash/flying ash. It is important to know in which form the sulphur component becomes absorbed in the flying ash-water pulp of approximately 1:1 mixing ratio. This study presents the thematic as well as temporal evolution of the detailed determination of mineralogical composition

ENGINEERING GEOLOGICAL SURVEY OF RÓZSADOMB AREA, BUDAPEST, HUNGARY

Late Triassic platform and extensional basinal sediments and Eocene shallow self carbonates are mainly covered by Oligocene clays, Pleistocene-Holocene slope sediments in the Rózsadomb area. Eocene carbonates are the host rocks of the extended (25 km) cave system, which passages are primarily tectonically controlled. The fractures and joints of the three major tectonic phases vvere enlarged by ascending thermal waters in the Plio-Pleistocene period. The presence of near surface cave passages raises special problems: hazards of cave collapse, especially when the cover beds are fractured Eocene marls; pollution of karst and related thermal water system from failure of sewer system or cesspits via fissures and cave passages. Damages in built environment are mainly related to landslides of the soaked clayey slope sediments, since in the deeper zones the 'solid' carbonate rocks are stable. The major trigger mechanism of the landslides is the precipitation combined with slope instability (human activity). To reduce the risk of landslides, damages and contaminations the reconstruction and extension of sewer system; the stricter regulations of human impact (control of townplanning regulations); the extension of protection zones and the exploration of the unknown cave system would be necessary