CO2 sequestration using waste concrete and anorthosite tailings by direct mineral carbonation in gas–solid–liquid and gas–solid routes

Ghacham, Alia Ben; Cecchi, Emmanuelle; Pasquier, Louis-César; Blais, Jean-François; Mercier, Guy

doi:10.1016/j.jenvman.2015.08.005

Cited by 61 publications

(23 citation statements)

References 33 publications

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“…Thus, the use of diluted sources such as industrial flue gases under mild conditions is preferable. Our previous work demonstrated that waste concrete obtained from the C&D activities is quite reactive when used in direct aqueous MC, under moderate temperature and pressure and the use of simulated flue gas (18% CO 2 ) (Ben Ghacham et al, 2015). In continuity with the precedent work, this study investigate the effects of the different factors that influence the reactivity of concrete under the conditions previously tested.…”

Section: Introductionmentioning

confidence: 90%

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Valorization of waste concrete through CO2 mineral carbonation: Optimizing parameters and improving reactivity using concrete separation

Ghacham

Pasquier

Cecchi

et al. 2017

Journal of Cleaner Production

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The use of CO 2 mineral carbonation represents an attractive approach to recycling waste concrete. In this study, the effect of gas pressure, Liquid/Solid (L/S) ratio (w/w), Gas/Liquid (G/L) ratio (v/v) and reaction time for CO 2 sequestration were investigated. While carbonation of such matrix is already described, this study opens new insights in concrete carbonation. To increase the reactivity potential of concrete, the fine fraction (<500 μm), which contains mostly cement paste, was separated from the inert coarse aggregates. Separation was conducted by crushing and sieving. The ground fine concrete fraction showed enhanced reactivity with 75% of CO 2 removed (corresponding to 0.057 g CO 2 removed/sample) compared to that of raw concrete, with 54% of CO 2 removed (corresponding to 0.034 g CO 2 removed/sample). Tests were conducted under 144 psi of gas pressure (9.93 Bars) at ambient temperature for 10 min. On the other hand, the resulting aggregates fraction have an improved potential recycling value. The new proposed approach allows better carbonation efficiency and increases the overall valuation of waste concrete. © 2017. AbbreviationsCO 2 c CO 2 converted CO 2 r CO 2 removed (sum of CO 2 dissolved and CO 2 converted)

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Section: Introductionmentioning

confidence: 90%

“…The formula used in this study is the same as that used in our previous work (Ben Ghacham et al, 2015):…”

Section: Calculationsmentioning

confidence: 99%

Valorization of waste concrete through CO2 mineral carbonation: Optimizing parameters and improving reactivity using concrete separation

Ghacham

Pasquier

Cecchi

et al. 2017

Journal of Cleaner Production

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“…Studies showed that carbonation of WC could lead to a reasonable amount of pressurized pure CO 2 converted into high-value-added precipitated calcium carbonates (PCC) [18,19]. Furthermore, the use of WC for reducing emissions directly from a cement plant stacks (without capture) using no chemicals or additives was also demonstrated [20]. More recently, the advantage of preconditioning WC to remove the non-reactive phases (aggregates and sand) showed that reactivity was increased [21].…”

Section: Introductionmentioning

confidence: 99%

Waste Concrete Valorization; Aggregates and Mineral Carbonation Feedstock Production

Pasquier

Kemache²,

Mocellin

et al. 2018

Geosciences

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Concrete is a major constituent of our world. Its contributes to building society but is also an important contributor to the global CO2 emissions. The combination of waste concrete recycling and greenhouse gas abatement is obviously an interesting approach. Mineral carbonation is the methodology that allows the use of calcium oxide within the concrete and transform it into carbonates with the CO2. Following previous results, carbonation experiments were performed using concrete paste extracted from a waste concrete sample after aggregate separation. The latter was performed after crushing and attrition followed by sieving to obtain three fractions. The coarser one composed of aggregates, the second of sand and the last, a fine powder of waste concrete paste (MCF). The MCF is then used in carbonation experiments in an 18.7 L stirred reactor with a diluted source of CO2 following previously optimized conditions. Different S/L ratios were experimented. The results show that 110 kg of CO2 can be stored per ton of MCF obtained after separation. Using the mass balance obtained from the experiments, an economic evaluation was performed on both aggregate separation and carbonation. While the first step can be profitable, using the MCF as a material for industrial flue gas abatement is less evident, both on the applicability and the feasibility.

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“…solid MC route is extremely slow and cannot be applied effectively [19][20][21] while addition of water can considerably enhance the MC rate 5,20,22,23 . Thus, gas-solid MC routes are excluded in this literature review.…”

Section: Introductionmentioning

confidence: 99%

The technology of CO₂ sequestration by mineral carbonation: current status and future prospects

Wang

Dreisinger

Jarvis³

et al. 2017

Canadian Metallurgical Quarterly

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This paper has been submitted for publication in the Canadian Metallurgical Quarterly (CMQ) journal. The technology of CO 2 sequestration by mineral carbonation: Current status and future prospects Abstract Mineral carbonation (MC) has been extensively researched all over the world since it was found as a natural exothermic process to permanently and safely sequester CO 2. In order to accelerate the natural process, various methods for carbonation of Mg-/Casilicate minerals and other industrial wastes have been studied. It has been found that the MC efficiency will increase with an increase of CO 2 pressure, retention time, temperature, mass ratio of Mg or Ca to Si in minerals, specific surface area, and the slurry concentration in a specific range, and with the introduction of effective catalysts, for example, 1M NaCl and 0.64M NaHCO 3 or carbonic anhydrase. However, there still is not a successful industrial application because of high economic cost and slow reaction rate. It is not economic to exploit Mg-and Ca-silicate minerals deposits or tailings to sequester CO 2 by MC, due to the cost of grinding and heat pre-treatment and in some cases the whole sequestration process may result in more CO 2 emissions than the amount of CO 2 sequestered due to the requirements of energy inputs. The process however, may be profitable as a whole (with carbon credits). It is suggested to combine MC with recovery of valuable metals from ore deposits in order to reduce the cost for MC by cost sharing for mineral recovery.

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CO2 sequestration using waste concrete and anorthosite tailings by direct mineral carbonation in gas–solid–liquid and gas–solid routes

Cited by 61 publications

References 33 publications

Valorization of waste concrete through CO2 mineral carbonation: Optimizing parameters and improving reactivity using concrete separation

Valorization of waste concrete through CO2 mineral carbonation: Optimizing parameters and improving reactivity using concrete separation

Waste Concrete Valorization; Aggregates and Mineral Carbonation Feedstock Production

The technology of CO₂ sequestration by mineral carbonation: current status and future prospects

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CO2 sequestration using waste concrete and anorthosite tailings by direct mineral carbonation in gas–solid–liquid and gas–solid routes

Cited by 61 publications

References 33 publications

Valorization of waste concrete through CO2 mineral carbonation: Optimizing parameters and improving reactivity using concrete separation

Valorization of waste concrete through CO2 mineral carbonation: Optimizing parameters and improving reactivity using concrete separation

Waste Concrete Valorization; Aggregates and Mineral Carbonation Feedstock Production

The technology of CO2 sequestration by mineral carbonation: current status and future prospects

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The technology of CO₂ sequestration by mineral carbonation: current status and future prospects