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Reactivity of calcined cement raw meals for carbonation

AuthorsPlou Gómez, Jorge; Martínez Berges, Isabel; Grasa Adiego, Gemma ; Murillo Villuendas, Ramón
KeywordsCement industry
CO2 capture
Raw meal
Calcium looping
Issue Date4-Jun-2019
CitationPowder Technology 354: 338-347 (2019)
AbstractIn this work, the suitability of two raw meals from cement manufacture was evaluated for use as CO2 sorbents. The evolution of their CO2 carrying capacity for the initial cycles was determined as a function of calcination conditions, and the Random Pore Model was applied to determine the kinetic parameters of the materials for carbonation. It was observed that the CO2 carrying capacity of the materials was totally dependent on reaction surface, which varies significantly with the calcination conditions (in terms of temperature and partial pressure of CO2). The presence of species other than CaO affected material sorption capacity but had no bearing on reaction kinetics. The calcined raw meal was able to reach maximum conversion in the short reaction times typical of entrained flow reactors, and the dependence of the critical CaCO3 product layer formed on CaO with reaction temperature was estimated.
Graphical abstract The initial reaction rate of calcined raw meals do not depend on the surface area. This is shown in different material with different textural properties and their kinetics determination. Surface area determines the critical conversion Xk-D and the behaviour of the diffusional controlled reaction rate along the cycles.
Description11 Figuras.- 2 Tablas
Publisher version (URL)http://dx.doi.org/10.1016/j.powtec.2019.05.084
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