Calcium looping spent sorbent as a limestone replacement in the manufacture of portland and calcium sulfoaluminate cements.
The calcium looping (CaL) spent sorbent (i) can be a suitable limestone replacement in the production of both ordinary Portland cement (OPC) and calcium sulfoaluminate (CSA) cement, and (ii) promotes environmental benefits in terms of reduced CO2 emission, increased energy saving and larger utilization of industrial byproducts. A sample of CaL spent sorbent, purged from a 200 kWth pilot facility, was tested as a raw material for the synthesis of two series of OPC and CSA clinkers, obtained from mixes heated in a laboratory electric oven within temperature ranges 1350°-1500 °C and 1200°-1350 °C, respectively. As OPC clinker-generating mixtures, six clay-containing binary blends were investigated, three with limestone (reference mixes) and three with the CaL spent sorbent. All of them showed similar burnability indexes. Moreover, three CSA clinker-generating blends (termed RM, MA and MB) were explored. They included, in the order: (I) limestone, bauxite and gypsum (reference mix); (II) CaL spent sorbent, bauxite and gypsum; (III) CaL spent sorbent plus anodization mud and a mixture of fluidized bed combustion (FBC) fly and bottom ashes. The maximum conversion toward 4CaO·3Al2O3·SO3, the chief CSA clinker component, was the largest for MB and almost the same for RM and MA.
†School of Engineering, Università degli Studi della Basilicata, Viale dell'Ateneo Lucano 10, 85100 Potenza, Italy.
Antonio
A
Telesca
†School of Engineering, Università degli Studi della Basilicata, Viale dell'Ateneo Lucano 10, 85100 Potenza, Italy.
Milena
M
Marroccoli
†School of Engineering, Università degli Studi della Basilicata, Viale dell'Ateneo Lucano 10, 85100 Potenza, Italy.
Michele
M
Tomasulo
†School of Engineering, Università degli Studi della Basilicata, Viale dell'Ateneo Lucano 10, 85100 Potenza, Italy.
Gian Lorenzo
GL
Valenti
‡Institute of Combustion and Power Plant Technology (IFK), University of Stuttgart, Pfaffenwaldring 23, 70569 Stuttgart, Germany.
Heiko
H
Dieter
§Department of Chemical Sciences, Università degli Studi di Napoli Federico II, Complesso Universitario di Monte Sant'Angelo, 80126 Napoli, Italy.
Fabio
F
Montagnaro
D017607:Aluminum Compounds / Q000737:chemistry*; D002118:Calcium / Q000737:chemistry*; D002119:Calcium Carbonate / Q000737:chemistry*; D017610:Calcium Compounds / Q000737:chemistry*; D003252:Construction Materials; D004055:Differential Thermal Analysis; D013052:Spectrometry, X-Ray Emission; D013457:Sulfur Compounds / Q000737:chemistry*; D013818:Thermogravimetry; D014961:X-Ray Diffraction
D017607:Aluminum Compounds; D017610:Calcium Compounds; D013457:Sulfur Compounds; C529583:calcium sulfoaluminate; D002119:Calcium Carbonate; D002118:Calcium