75762 20190709135423.0 doi 10.1016/j.fuproc.2016.10.026 sideral 97121 ART-2017-97121 eng Telesca, A. Use of oxyfuel combustion ash for the production of blended cements: a synergetic solution toward reduction of CO2 emissions 2017 Access copy available to the general public Unrestricted In this paper, it is investigated the possibility of reusing ashes, issued by an oxyfuel combustion process aimed at mitigating CO2 emission, as substitutes for natural pozzolan in the production of low-CO2 blended cements. To this end, the oxyfuel plant (a 95 kWth pilot-scale fluidized bed reactor) was operated under controlled conditions by feeding blends of anthracite or lignite and biomass corn stover. Characterization of fly and bottom ashes revealed that the latter showed properties able to make them considerable for obtaining blended cements by mixing them with Portland clinker and natural gypsum. The cements were subjected to pozzolanicity and hydration tests for curing times ranging from 2 to 28 d at 20° and 40 °C. X-ray fluorescence and diffraction, differential thermal–thermogravimetric analyses and scanning electron microscopy were employed as characterization techniques. With reference to a standard blended cement, and with particular eye on the blended cement containing bottom ashes obtained from the lignite–biomass mixture combustion, it was observed a good similarity in the ability of the silico-aluminous fraction to react with Ca(OH)2 produced by Portland clinker hydration, to yield the desired calcium silicate hydrates among the hydration products. info:eu-repo/semantics/openAccess by-nc-nd http://creativecommons.org/licenses/by-nc-nd/3.0/es/ 3.956 2017 CHEMISTRY, APPLIED 8 / 71 = 0.113 2017 Q1 T1 ENGINEERING, CHEMICAL 21 / 137 = 0.153 2017 Q1 T1 ENERGY & FUELS 29 / 97 = 0.299 2017 Q2 T1 1.453 2017 Chemical Engineering (miscellaneous) 2017 Q1 Fuel Technology 2017 Q1 Energy Engineering and Power Technology 2017 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/submittedVersion Marroccoli, M. Ibris, N. Lupiáñez, C. (orcid)0000-0003-4304-6685 Díez, L. I. Universidad de Zaragoza (orcid)0000-0001-7379-6159 Romeo, L. M. Universidad de Zaragoza Montagnaro, F. 5004 590 Universidad de Zaragoza Dpto. Ingeniería Mecánica Área Máquinas y Motores Térmi. 156 (2017), 211-220 Fuel process. technol. Fuel Processing Technology 0378-3820 1456139 http://zaguan.unizar.es/record/75762/files/texto_completo.pdf Preprint 46663 http://zaguan.unizar.es/record/75762/files/texto_completo.jpg?subformat=icon icon Preprint oai:zaguan.unizar.es:75762 articulos driver 2019-07-09-11:27:38 ARTICLE