Sustainable transformation of fly ash industrial waste into a construction cement blend via CO 2 carbonation

Ebrahimi, Aida; Saffari, Morteza; Milani, Dia; Montoya, Alejandro; Valix, Marjorie; Abbas, Ali

doi:10.1016/j.jclepro.2017.04.037

Cited by 77 publications

(33 citation statements)

References 25 publications

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“…In addition, some authors indicate that the appropriate pH for aqueous carbonation reactions is greater than 10 [12,17]. They also report that below pH = 8.3, there is a solution of carbonates, and we consider that this pH value indicates the end of the carbonation reaction [14,18].…”

Section: Conversion Ratementioning

confidence: 93%

CO2 Capture by Alkaline Carbonation as an Alternative to a Circular Economy

et al. 2020

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In order to combat global warming and climate change in a sustainable way, it is necessary to capture the anthropogenic CO2 emitted by different industrial sources and use it as a raw material to obtain a matrix of products for industrial use, such as metal carbonates. Therefore, this work presents the results of CO2 capture and conversion into carbonates using Sr and Ba alkaline solutions in a semi-continuous batch reactor. The results indicate that the effects of morphological characterization, purity of solids, and reaction time at ambient temperature and atmospheric pressure conditions is an inexpensive alternative process that is easily implemented in small industrial enterprises. The results yielded a 40% conversion of CO2 at the best reaction conditions with an aqueous solution of Sr(OH)2.

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Section: Conversion Ratementioning

confidence: 93%

CO2 Capture by Alkaline Carbonation as an Alternative to a Circular Economy

et al. 2020

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“…The studies on the use of ashes from coal-fired power generation are carried out in many countries (noack et al 2014;Mayoral et al 2013;Siriruang et al 2016;Ukwattage et al 2013Ukwattage et al , 2015Guo et al 2015;Ebrahimi et al 2017;Ji et al 2017;Jo et al 2012;Dananjayan et al 2016;Mazzella et al 2016;Wee 2013;Bobicki et al 2012), including Poland (Uliasz--Bocheńczyk et al 2006a, b, 2007, 2008, 2009, 2011, 2012, 2013, Uliasz-Bocheńczyk 2008, 2009, 2010, 2011.…”

Section: The Mineral Sequestration Of Co 2 With the Use Of Fly Ash Frmentioning

confidence: 99%

The mineral sequestration of CO2 with the use of fly ash from the co-combustion of coal and biomass

Uliasz-Bocheńczyk¹,

Pawluk²,

Pyzalski³

2017

Gospodarka Surowcami Mineralnymi

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Summary As a result of energy production processes, the power industry is the largest source of CO2 emissions in Poland. Emissions from the energy sector accounted for 52.37% (162 689.57 kt) of the total emissions in 2015, which was estimated at 310.64 million tons of CO2. In recent years, the tightening of regulations on the use of renewable energy sources has resulted in an increased amount of biomass used in the professional energy industry. This is due to the fact that the CO2 emissions from biomass combustion are not included in the total emissions from the combustion of fuels, resulting in the zero- emission factor for biomass. At the same time, according to the hierarchy of waste management methods, recycling is the preferred option for the management of by-products generated during energy production. The fly ashes resulting from the biomass combustion in pulverized boilers (which, due to their chemical composition, can be classified as silicate ash) were subjected to analysis. These ashes can be classified as waste 10 01 17 - fly ash from co-firing other than mentioned in 10 01 16 according to the Regulation of the Minister of the Environment of December 9, 2014 on waste catalogues. The maximum theoretical carbon dioxide binding capacity for the analyzed fly ashes resulting from the co-combustion of biomass is 8.03%. The phase composition analysis of the fly ashes subjected to carbonation process has shown, in addition to the components identified in pure fly ash samples (SiO2, mullite), the presence of calcium carbonate − calcite − the primary product of the carbonation process, as indicated by the results of both X-ray and thermogravimetric analysis.The degree of carbonation has been determined based on the analysis of the results of the phase composition of fly ash resulting from the co-firing of biomass and bituminous coal. The calculated degree of carbonation amounted to 1.51%. The carbonation process is also confirmed by the lowered pH of the water extracts, decreasing from 11.96 for pure ashes to 8.7 for CO2 treated fly ashes. In addition, the carbonation process has reduced the leaching of pollutants, most notably chlorides, sulphates, and potassium.

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“…Due to the costly cement production process, alkaline industrial wastes for CO 2 mineralization are receiving more attention as supplementary cementitious materials in concrete. Previous studies investigated the use of calcium silicate, fly ash, steel slag, blast furnace slag, and MgO, which would become a sustainable practice to make the cement industry more environmentally friendly . These waste materials are widely scattered around the globe, especially in developing countries.…”

Section: Introductionmentioning

confidence: 99%

Carbonation curing of industrial solid waste‐based aerated concretes

et al. 2019

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Mineral carbonation for concrete curing is a promising route to large‐scale CO2 sequestration and the economic production of building materials. In this work, the carbonation curing of a kind of lightweight concrete, aerated concrete, was comprehensively studied. Three typical industrial wastes – fly ash, blast furnace slag, and red mud – were employed to replace part of the cement and to reduce the carbon footprint of products. The effects of carbonation curing time, pressure, and water‐to‐solids ratio on the CO2 uptake and compressive strength were investigated. Aerated concrete with red mud showed the highest CO2 uptake capacity, followed by concrete with fly ash, and concrete with blast furnace slag. The main crystalline carbonation products, needle‐like calcite and rod‐like aragonite, were observed to be embedded in the surface of fly ash and blast‐furnace‐slag‐based specimens. The orderly structures of carbonated crystals, as well as the reduction of mesoscale porosity (< 50 nm), resulted in an enhancement of mechanical properties. For red‐mud‐based specimens, calcite crystals with the appearance of grains (smaller than 1μm) were formed due to deeper carbonation. The rapid growth of calcite grains may lead to cracks from inside red‐mud‐based specimens and cause a negative effect on mechanical properties. In terms of mechanical performance, the blast furnace slag specimens, after carbonation curing, exhibited the largest compressive strength of 7.3 MPa, which was over 197% higher than that of natural curing for the same duration. © 2019 Society of Chemical Industry and John Wiley & Sons, Ltd.

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Sustainable transformation of fly ash industrial waste into a construction cement blend via CO 2 carbonation

Cited by 77 publications

References 25 publications

CO2 Capture by Alkaline Carbonation as an Alternative to a Circular Economy

CO2 Capture by Alkaline Carbonation as an Alternative to a Circular Economy

The mineral sequestration of CO2 with the use of fly ash from the co-combustion of coal and biomass

Carbonation curing of industrial solid waste‐based aerated concretes

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