Assessment of Accelerated Carbonation Processes for CO2 Storage Using Alkaline Industrial Residues

An assessment of accelerated carbonation processes applied to industrial residues for CO2 storage was performed with the aim of gaining insight on the feasibility of this process at larger scale, identifying also the key factors for its implementation. Specifically, the material and energy requirements of two types of direct carbonation routes, the slurry phase process and the wet route, were evaluated, and the influence of the properties of the residues (i.e., main mineralogy and particles size) and of the reaction routes and operating conditions applied (i.e., temperature, CO2 pressure, and liquid-to-solid ratio) was analyzed. In addition, the possibility of directly treating diluted sources of CO2, thus avoiding the capture step, was assessed for the wet route by performing lab-scale tests with gas mixtures containing 40% or 9% CO2.