The environmentally friendly features of calcium sulfoaluminate (CSA) cements, in terms of reduced CO2 emission and increased energy saving, can be further enhanced if a poorly carbonated CaO source is utilized instead of limestone as a kiln feed component. This work deals with an original proposal based on the use of a by-product of a novel process still under investigation, the calcium looping (CaL) spent sorbent, as a main source of lime. Three CSA clinker-generating raw mixes containing 20–21% by mass of this residue, purged after 60 calcination/carbonation cycles from a 200 kWth dual fluidized bed pilot facility, were investigated. They also included anodization mud (54–61%) as main Al2O3 source, and fluidized bed combustion fly (13–26%) and bottom (9–18%) ashes, separately or in mixture, both able to give calcium sulfate as well as additional alumina and uncarbonated lime. Furthermore, the behavior of a raw mix, containing only natural materials (30.4% limestone, 40.4% bauxite, 29.2% gypsum) and used as a reference term, was explored. All the synthetic CSA clinkers were obtained by heating for two hours the generating raw mixes in a laboratory electric oven, at temperatures comprised between 1200° and 1350°C. X-ray diffraction analysis showed that, with respect to the reference system, the waste-based mixes were able to give a better conversion toward the main clinker component, 4CaO∙3Al2O3∙SO3, especially at 1250° or 1300°C. All the hydrated CSA cements obtained from the corresponding clinkers, when investigated by means of differential thermal–thermogravimetric analysis, displayed a similar behavior.

Low-CO2 cements from fluidized bed process wastes and other industrial by-products / Telesca, A.; Marroccoli, M.; Tomasulo, M.; Valenti, G. L.; Dieter, H.; Montagnaro, Fabio. - Articolo numero SC13_135(2015), pp. 1-12. (Intervento presentato al convegno 9th Mediterranean Combustion Symposium tenutosi a Rhodes, Greece. nel 7-11 Giugno 2015).

Low-CO2 cements from fluidized bed process wastes and other industrial by-products

MONTAGNARO, FABIO
2015

Abstract

The environmentally friendly features of calcium sulfoaluminate (CSA) cements, in terms of reduced CO2 emission and increased energy saving, can be further enhanced if a poorly carbonated CaO source is utilized instead of limestone as a kiln feed component. This work deals with an original proposal based on the use of a by-product of a novel process still under investigation, the calcium looping (CaL) spent sorbent, as a main source of lime. Three CSA clinker-generating raw mixes containing 20–21% by mass of this residue, purged after 60 calcination/carbonation cycles from a 200 kWth dual fluidized bed pilot facility, were investigated. They also included anodization mud (54–61%) as main Al2O3 source, and fluidized bed combustion fly (13–26%) and bottom (9–18%) ashes, separately or in mixture, both able to give calcium sulfate as well as additional alumina and uncarbonated lime. Furthermore, the behavior of a raw mix, containing only natural materials (30.4% limestone, 40.4% bauxite, 29.2% gypsum) and used as a reference term, was explored. All the synthetic CSA clinkers were obtained by heating for two hours the generating raw mixes in a laboratory electric oven, at temperatures comprised between 1200° and 1350°C. X-ray diffraction analysis showed that, with respect to the reference system, the waste-based mixes were able to give a better conversion toward the main clinker component, 4CaO∙3Al2O3∙SO3, especially at 1250° or 1300°C. All the hydrated CSA cements obtained from the corresponding clinkers, when investigated by means of differential thermal–thermogravimetric analysis, displayed a similar behavior.
2015
Low-CO2 cements from fluidized bed process wastes and other industrial by-products / Telesca, A.; Marroccoli, M.; Tomasulo, M.; Valenti, G. L.; Dieter, H.; Montagnaro, Fabio. - Articolo numero SC13_135(2015), pp. 1-12. (Intervento presentato al convegno 9th Mediterranean Combustion Symposium tenutosi a Rhodes, Greece. nel 7-11 Giugno 2015).
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/621404
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