Experiments and modelling to understand FeCO3 cement formation mechanism: time-evolution of CO2-species, dissolved-Fe, and pH during CO2-induced dissolution of Fe(0)
نویسندگان
چکیده
FeCO3 cement can be produced by reacting CO2(aq) and particulate-Fe(0). Process conditions solution compositions influence properties through kinetics of Fe-dissolution FeCO3-precipitation. This study investigates in dilute systems (water(wt.)/Fe(wt.) = 1000) at 30/60 °C, 1/10 barg CO2-pressures. Experimentally, time-evolution composition shows increased [Fe] solution-pH. As a proxy for high-pressure in-situ experiments, modeling approach is developed to quantify with [Fe]-increase, the: decreased [H+], [HCO3-]/[OH–]/[CO32-], undisturbed [CO2(aq)]/[H2CO3]. rates increase with: (a) pH-decrease CO2-pressure, (b) faster higher temperatures, even pH. Experimental modeled pH are comparable 1 bar, two causes discussed it being ∼ 1.2 times 10 barg: CO2-depressurization, Fe-precipitation. Lower CO2-mediated dissolution activation energies 30 (1 barg) 20 kJ/mol (10 compared strong acids (∼60 kJ/mol) attributed buffering action CO2(aq).
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ژورنال
عنوان ژورنال: Construction and Building Materials
سال: 2022
ISSN: ['1879-0526', '0950-0618']
DOI: https://doi.org/10.1016/j.conbuildmat.2022.128281