Lime in the limelight

Dowling, Aideen; O’Dwyer, Jean; Adley, Catherine C.

doi:10.1016/j.jclepro.2014.12.047

Cited by 73 publications

(46 citation statements)

References 46 publications

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“…Some data indicate that the production of 1 ton of hydrated lime emits about 1.2 tons of CO 2 in the atmosphere. 26,38,39 Therefore, studies that propose the replacement of hydrated lime are as important as the studies that evaluate the replacement of Portland cement.…”

Section: Methodsmentioning

confidence: 99%

“…It is worth noting that the production of hydrated lime is highly polluting, since it is necessary to burn the limestone, similar to the process that occurs in the production of cement. Some data indicate that the production of 1 ton of hydrated lime emits about 1.2 tons of CO 2 in the atmosphere 26,38,39 . Therefore, studies that propose the replacement of hydrated lime are as important as the studies that evaluate the replacement of Portland cement.…”

Section: Methodsmentioning

confidence: 99%

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Circular economy in cementitious ceramics: Replacement of hydrated lime with a stoichiometric balanced combination of clay and marble waste

Marvila¹,

Azevedo

Alexandre³

et al. 2020

Int J Applied Ceramic Tech

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Cementitious ceramics, produced from the hydration of cement and hydrated lime, are responsible for a great deal of damage to the environment due to the high emission of CO 2 that occurs in the production of cement and lime. Therefore, the objective of this work was to substitute the hydrated lime with a combination of clay residue and marble waste extracted from ceramic and ornamental rock producing industries, respectively, which constitutes a circular economy for the ceramic industry related to masonry applications. Ceramics were produced in the proportion 1:1:6:1.5 (cement:lime:sand:water), through the molding procedure, and were studied by replacing hydrated lime with 100% clay residue and 100% marble residue, in addition to stoichiometric calculated parts of marble to clay. The molar ratios used were 1:1, 1:2, and 2:1 (marble:clay). Tests of consistency, incorporated air content, water retention, compression strength, density, water absorption by capillarity, adhesion, and electrical resistivity were performed. The results obtained demonstrate that the use of residue of marble and clay together, as long as they are correctly balanced, provides a high gain in technological properties, enabling the circular economy of cementitious ceramics, mainly for the composition 1 marble:1clay, which presented the best properties, both in the fresh and hardened state. The economic analysis carried out proved the financial gains for the industrial sectors involved (civil construction, ornamental rock, and ceramic).

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Circular economy in cementitious ceramics: Replacement of hydrated lime with a stoichiometric balanced combination of clay and marble waste

Marvila¹,

Azevedo

Alexandre³

et al. 2020

Int J Applied Ceramic Tech

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“…Here, instead of using electrolytic decarbonation for CO 2 capture, we liberate the CO 2 as a gaseous product to be captured and sequestered, or used in other processes, and precipitate the Ca(OH) 2 for use in cement production. Note that in addition to cement production, Ca(OH) 2 is an important component in the manufacture of refined sugar, pulp and paper, alkali carbonates, for wastewater remediation, and as a fluxing agent in steel refining (31). Typically the Ca(OH) 2 is produced by slaking of CaO obtained by calcination of CaCO 3 ; using our decarbonation reactor, Ca(OH) 2 could be produced directly for these applications as well, while allowing direct capture of the CO 2 produced.…”

Section: [7]mentioning

confidence: 99%

Toward electrochemical synthesis of cement—An electrolyzer-based process for decarbonating CaCO ₃ while producing useful gas streams

Ellis

Badel

Chiang

et al. 2019

Proc. Natl. Acad. Sci. U.S.A.

178

107

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Cement production is currently the largest single industrial emitter of CO2, accounting for ∼8% (2.8 Gtons/y) of global CO2emissions. Deep decarbonization of cement manufacturing will require remediation of both the CO2emissions due to the decomposition of CaCO3to CaO and that due to combustion of fossil fuels (primarily coal) in calcining (∼900 °C) and sintering (∼1,450 °C). Here, we demonstrate an electrochemical process that uses neutral water electrolysis to produce a pH gradient in which CaCO3is decarbonated at low pH and Ca(OH)2is precipitated at high pH, concurrently producing a high-purity O2/CO2gas mixture (1:2 molar ratio at stoichiometric operation) at the anode and H2at the cathode. We show that the solid Ca(OH)2product readily decomposes and reacts with SiO2to form alite, the majority cementitious phase in Portland cement. Electrochemical calcination produces concentrated gas streams from which CO2may be readily separated and sequestered, H2and/or O2may be used to generate electric power via fuel cells or combustors, O2may be used as a component of oxyfuel in the cement kiln to improve efficiency and lower CO2emissions, or the output gases may be used for other value-added processes such as liquid fuel production. Analysis shows that if the hydrogen produced by the reactor were combusted to heat the high-temperature kiln, the electrochemical cement process could be powered solely by renewable electricity.

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“…Today, however, the production of Ca(OH) 2 features a CO 2 footprint similar to OPC production ($1 t of CO 2 per t of Ca(OH) 2 produced). This is because Ca(OH) 2 production, similar to OPC production is based around the ageold process of limestone calcination (i.e., thermal decomposition, which results in the desorption of the "mineralized CO 2 " bound within the limestone and accounts for z65% emissions associated with the process; the remainder being from the combustion of fossil fuels to power kiln operations) at z900 C to produce CaO, 12,13 the precursor of Ca(OH) 2 ; that is subsequently granulated and hydrated (i.e., contacted with water) to produce Ca(OH) 2 . In addition, the process requires quarried limestone that not only consumes nonrenewable mineral resources, but also disrupts ecosystems, and causes pollution and biodiversity destruction.…”

Section: Introductionmentioning

confidence: 99%

Calcination-free production of calcium hydroxide at sub-boiling temperatures

et al. 2021

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Lime in the limelight

Cited by 73 publications

References 46 publications

Circular economy in cementitious ceramics: Replacement of hydrated lime with a stoichiometric balanced combination of clay and marble waste

Circular economy in cementitious ceramics: Replacement of hydrated lime with a stoichiometric balanced combination of clay and marble waste

Toward electrochemical synthesis of cement—An electrolyzer-based process for decarbonating CaCO ₃ while producing useful gas streams

Calcination-free production of calcium hydroxide at sub-boiling temperatures

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Lime in the limelight

Cited by 73 publications

References 46 publications

Circular economy in cementitious ceramics: Replacement of hydrated lime with a stoichiometric balanced combination of clay and marble waste

Circular economy in cementitious ceramics: Replacement of hydrated lime with a stoichiometric balanced combination of clay and marble waste

Toward electrochemical synthesis of cement—An electrolyzer-based process for decarbonating CaCO 3 while producing useful gas streams

Calcination-free production of calcium hydroxide at sub-boiling temperatures

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Toward electrochemical synthesis of cement—An electrolyzer-based process for decarbonating CaCO ₃ while producing useful gas streams