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Open AccessArticle

Proposed Methodology to Evaluate CO2 Capture Using Construction and Demolition Waste

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Departamento de Cristalografía, Mineralogía y Q. Agrícola, Facultad de Química, Universidad de Sevilla, 41012 Sevilla, Spain
2
Departamento de Construcciones Arquitectónicas II, Escuela Técnica Superior de Ingeniería de Edificación, Universidad de Sevilla, 41012 Sevilla, Spain
*
Author to whom correspondence should be addressed.
Minerals 2019, 9(10), 612; https://doi.org/10.3390/min9100612
Received: 8 August 2019 / Revised: 30 September 2019 / Accepted: 1 October 2019 / Published: 5 October 2019
(This article belongs to the Special Issue Geological and Mineralogical Sequestration of CO2)
Since the Industrial Revolution, levels of CO2 in the atmosphere have been constantly growing, producing an increase in the average global temperature. One of the options for Carbon Capture and Storage is mineral carbonation. The results of this process of fixing are the safest in the long term, but the main obstacle for mineral carbonation is the ability to do it economically in terms of both money and energy cost. The present study outlines a methodological sequence to evaluate the possibility for the carbonation of ceramic construction waste (brick, concrete, tiles) under surface conditions for a short period of time. The proposed methodology includes a pre-selection of samples using the characterization of chemical and mineralogical conditions and in situ carbonation. The second part of the methodology is the carbonation tests in samples selected at 10 and 1 bar of pressure. The relative humidity during the reaction was 20 wt %, and the reaction time ranged from 24 h to 30 days. To show the effectiveness of the proposed methodology, Ca-rich bricks were used, which are rich in silicates of calcium or magnesium. The results of this study showed that calcite formation is associated with the partial destruction of Ca silicates, and that carbonation was proportional to reaction time. The calculated capture efficiency was proportional to the reaction time, whereas carbonation did not seem to significantly depend on particle size in the studied conditions. The studies obtained at a low pressure for the total sample were very similar to those obtained for finer fractions at 10 bars. Presented results highlight the utility of the proposed methodology. View Full-Text
Keywords: suitable methodology for mineral carbonation; construction and demolition waste suitable methodology for mineral carbonation; construction and demolition waste
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Martín, D.; Flores-Alés, V.; Aparicio, P. Proposed Methodology to Evaluate CO2 Capture Using Construction and Demolition Waste. Minerals 2019, 9, 612.

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