Utilization of high-calcium fly ashes through mineral carbonation: The cases for Greece, Poland and Spain

Cwik, Agnieszka; Casanova, I.; Rausis, Kwon; Zarębska, Katarzyna

doi:10.1016/j.jcou.2019.03.020

Cited by 39 publications

(16 citation statements)

References 40 publications

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“…Based on the manufacturer's information, the major components in the fly ash were oxides of SiO [57][58][59][60]. The most common mineral composition of ash is quartz, mullite, anhydrite, anorthite, gehlenite, hematite, lime, the amorphous phase of calcium aluminosilicate glass, and unburned fuel [58][59][60][61]. The CFA from Bełchatów exhibited natural radioactivity, but the f 1 and f 2 activity indexes were below the respective limits of 0.79-0.90 and 118-150 Bq/kg [58,62].…”

Section: Physical-chemical Characteristics Of Cfa-hap Compositesmentioning

confidence: 99%

Characterization of the Physical, Chemical, and Adsorption Properties of Coal-Fly-Ash–Hydroxyapatite Composites

et al. 2021

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(1) Hydroxyapatite (Hap), which can be obtained by several methods, is known to be a good adsorbent. Coal fly ash (CFA) is a commonly reused byproduct also used in environmental applications as an adsorbent. We sought to answer the following question: Can CFA be included in the method of Hap wet synthesis to produce a composite capable of adsorbing both heavy metals and dyes? (2) High calcium lignite CFA from the thermal power plant in Bełchatów (Poland) was used as the base to prepare CFA–Hap composites. Four types designated CFA–Hap1–4 were synthesized via the wet method of in situ precipitation. The synthesis conditions differed in terms of the calcium reactants used, pH, and temperature. We also investigated the equilibrium adsorption of Cu(II) and rhodamine B (RB) on CFA–Hap1–4. The data were fitted using the Langmuir, Freundlich, and Redlich–Peterson models and validated using R2 and χ2/DoF. Surface changes in CFA–Hap2 following Cu(II) and RB adsorption were assessed using SEM, SE, and FT-IR analysis. (3) The obtained composites contained hydroxyapatite (Ca/P 1.67) and aluminosilicates. The mode of Cu(II) and RB adsorption could be explained by the Redlich–Peterson model. The CFA–Hap2 obtained using CFA, Ca(NO3)2, and (NH4)2HPO4 at RT and pH 11 exhibited the highest maximal adsorption capacity: 73.6 mg Cu/g and 87.0 mg RB/g. (4) The clear advantage of chemisorption over physisorption was indicated by the Cu(II)–CFA–Hap system. The RB molecules present in the form of uncharged lactone were favorably adsorbed even on strongly deprotonated CFA–Hap surfaces.

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Section: Physical-chemical Characteristics Of Cfa-hap Compositesmentioning

confidence: 99%

Characterization of the Physical, Chemical, and Adsorption Properties of Coal-Fly-Ash–Hydroxyapatite Composites

et al. 2021

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“…The minerals’ carbonation is mainly performed in two ways: the direct route, which involves only the step of carbonation, and the indirect, which includes the extra step of Ca extraction prior to the carbonation [ 44 ]. The simpler route of direct carbonation often requires high energy input, demanding elevated temperature and/or pressure in the presence of high CO 2 concentration [ 48 , 49 , 50 ]. At the moment, the few studies that investigated a low-energy carbonation process are focused on coal fly ash [ 51 , 52 ].…”

Section: Introductionmentioning

confidence: 99%

Biomass Bottom Ash as Supplementary Cementitious Material: The Effect of Mechanochemical Pre-Treatment and Mineral Carbonation

et al. 2022

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The need to mitigate the CO2 emissions deriving from the cement industry becomes imperative as the climate crisis advances. An effective strategy to achieve this is increasing the replacement level of cement clinkers by waste-derived supplementary cementitious materials (SCMs). In this study, the use of mechanochemically activated biomass ash for high-volume (up to 40%) substitution of cement is investigated. The effect of mineral carbonation treatment on the performance of the mechanochemically treated biomass ash as SCM was also examined. The results showed that the mechanochemically treated biomass ash was the most effective SCM, with the respective samples at 40% cement replacement reaching 63% of the strength at 28 days as compared to samples with 100% Portland cement, while only 17% of the strength was achieved in samples with 40% untreated biomass ash. As suggested by the isothermal calorimetry, XRD, FTIR, and TG analysis, the mechanochemical treatment enhanced the reactivity and the filler effect of the biomass ash, leading to improved mechanical performances of these mortars compared to those containing untreated biomass ash. Mineral carbonation reduced the reactivity of the mechanochemically treated biomass ash but still led to better strength performances in comparison to the untreated biomass ash.

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“…Following our previous results [28,29], the studies have been extended to performing carbonation with simulated flue gas (84% N 2 , 15% CO 2 and 1% H 2 O) [30,31] and comparing the results with the same experiments using concentrated CO 2 . Capturing CO 2 as an initial step is avoided if flue gas is used instead of concentrated CO 2 for mineral carbonation reactions [32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Carbonation of High-Ca Fly Ashes under Flue Gas Conditions: Implications for Their Valorization in the Construction Industry

et al. 2021

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The utilization of high-calcium fly ashes (HCFA) from coal-fired power plants in the construction industry is problematic, since their high free lime contents can lead to durability problems. In this research, the carbonation of a high-CaO fly ash has been carried out using simulated flue gas and concentrated CO2, with the aim to assess the valorization potential of such materials in the construction industry. The results show that, at 7 bars total pressure, an up to 36% carbonation efficiency can be achieved in just 30 min when pure CO2 is used; a comparable result with flue gas requires about 4 h of reaction. On the other hand, experiments carried out at atmospheric pressure show significantly different carbonation efficiencies depending on the CO2 concentration of the gas used. All experiments resulted in a substantial reduction in the original free lime content, and after reaction times of 4 h (at atmospheric pressure) and pressures of 7 bars (for any reaction time >30 min), the final free lime values were low enough to comply with the requirements of European Standards for their utilization as additions in cement.

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Utilization of high-calcium fly ashes through mineral carbonation: The cases for Greece, Poland and Spain

Cited by 39 publications

References 40 publications

Characterization of the Physical, Chemical, and Adsorption Properties of Coal-Fly-Ash–Hydroxyapatite Composites

Characterization of the Physical, Chemical, and Adsorption Properties of Coal-Fly-Ash–Hydroxyapatite Composites

Biomass Bottom Ash as Supplementary Cementitious Material: The Effect of Mechanochemical Pre-Treatment and Mineral Carbonation

Carbonation of High-Ca Fly Ashes under Flue Gas Conditions: Implications for Their Valorization in the Construction Industry

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