Despite a low chemical reactivity, recent trends in the innovative uses of coal fly ash based on the chemical properties have been successful. Lots of fly ash showing sharply alkaline reaction (water pH rising to 11–12 upon contact) usually are high-calcium (–4%), most of which is present as CaO. These lots are suitable to be used as remotion agents of heavy metals in wastewater or retentive agents of them in polluted solids. Lots giving substantially neutral reaction are usually low-calcium (0–3%). They are suitable for conversion by hydrothermal treatments into zeolitic products, where higher calcium contents interfere.A reverse destination is destitute of good results. Causes are discussed.
Influence of the calcium content on the coal fly ash features in some innovative applications / Catalfamo, P; DI PASQUALE, S; Corigliano, F; Mavilia, Letterio. - In: RESOURCES, CONSERVATION AND RECYCLING. - ISSN 0921-3449. - 20:2(1997), pp. 4.119-4.125. (Intervento presentato al convegno 3rd International Conference on the Environmental and Technical Implications of Construction with Alternative Materials. tenutosi a Houthem St. Gerlach (The Netherland) nel June, 4-6).
Influence of the calcium content on the coal fly ash features in some innovative applications
MAVILIA, Letterio
1997-01-01
Abstract
Despite a low chemical reactivity, recent trends in the innovative uses of coal fly ash based on the chemical properties have been successful. Lots of fly ash showing sharply alkaline reaction (water pH rising to 11–12 upon contact) usually are high-calcium (–4%), most of which is present as CaO. These lots are suitable to be used as remotion agents of heavy metals in wastewater or retentive agents of them in polluted solids. Lots giving substantially neutral reaction are usually low-calcium (0–3%). They are suitable for conversion by hydrothermal treatments into zeolitic products, where higher calcium contents interfere.A reverse destination is destitute of good results. Causes are discussed.| File | Dimensione | Formato | |
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