CO&lt;sub&gt;2&lt;/sub&gt; Sequestration by Indirect Carbonation of High-Calcium Coal Fly Ash

He, Lan Lan; Yu, Dunxi; Lv, Wei; Wu, J.; Xu, Ming

doi:10.4028/www.scientific.net/amr.726-731.2870

Cited by 8 publications

(4 citation statements)

References 10 publications

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“…A detailed procedure can be found elsewhere. 46 The purity of PCC measured by the two methods is in good agreement, being about 97−98%. This value meets the purity requirements (≥97%) of PCC for industrial use.…”

Section: Mineralogy Of Coal Fly Ash and Its Extractionmentioning

confidence: 84%

A Novel Method for CO₂ Sequestration via Indirect Carbonation of Coal Fly Ash

et al. 2013

Ind. Eng. Chem. Res.

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Coal fly ash is a potential candidate for CO 2 mineral sequestration. If calcium is extracted selectively from coal fly ash prior to carbonation (namely indirect carbonation), a high-purity and marketable precipitated calcium carbonate (PCC) can be obtained. In the extraction process, recyclable ammonium salt (i.e., NH 4 Cl/NH 4 NO 3 /CH 3 COONH 4 ) solution was used as a calcium extraction agent in this study. The influence of time, temperature, agent concentration, and solid-to-liquid ratio on calcium extraction efficiency was explored. NH 4 Cl/NH 4 NO 3 /CH 3 COONH 4 are confirmed to be effective calcium extraction agents for the high-calcium coal fly ash investigated, and about 35−40% of the calcium is extracted into the solution within an hour. The calcium extraction performance is best for CH 4 COONH 4 , followed by NH 4 NO 3 and NH 4 Cl. Increasing temperature from 25 to 90°C and agent concentration from 0.5 to 3 mol/L only subtly increases calcium extraction efficiency for NH 4 Cl and NH 4 NO 3 , while the positive effect of increasing temperature and agent concentration is more obvious for CH 3 COONH 4 . In the carbonation process, carbonation efficiency, namely conversion of Ca 2+ into precipitated calcium carbonate(PCC), is only 41− 47% when the leachate is carbonated by CO 2 . A newly proposed method of substituting CO 2 with NH 4 HCO 3 as the source of CO 3 2− yields much higher carbonation efficiency (90−93%). Furthermore, the carbonation reaction rate is also largely improved when carbonating the leachate by NH 4 HCO 3 . In addition to these benefits, CO 2 capture and storage can be simultaneously realized on-site if integrating the leachate carbonation process with an ammonia−water CO 2 capture process using NH 4 HCO 3 as a connector. In this way, the costs associated with CO 2 compression and transportation can be eliminated. PCC with a purity up to 97−98% is obtained, which meets the purity requirement (≥97%) of industrially used PCC. It is estimated based on the experimental results that 0.17 tons of PCC can be produced from 1 ton of coal fly ash by this method, bounding 0.075 tons of CO 2 at the same time, and 0.036 tons more CO 2 can be avoided if the obtained PCC is substituted for the PCC manufactured by the conventional energy-intensive method.

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Section: Mineralogy Of Coal Fly Ash and Its Extractionmentioning

confidence: 84%

A Novel Method for CO₂ Sequestration via Indirect Carbonation of Coal Fly Ash

et al. 2013

Ind. Eng. Chem. Res.

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“…He et al [48,49] explored the effect of various extraction agents (i.e., NH 4 Cl, NH 4 NO 3 , and CH 3 COONH 4 ) on Ca 2+ extraction efficiency from COFA particles. The above three ammonia salts were all effective Ca 2+ extraction agents, achieving a calcium leaching efficiency of about 35-40% within 1 h. CH 4 COONH 4 was superior to the other two ammonia salts in promoting Ca 2+ extraction of COFA.…”

Section: Indirect Carbonationmentioning

confidence: 99%

A Review on CO2 Sequestration via Mineralization of Coal Fly Ash

Jiang,

Cheng,

Zhang

et al. 2023

Energies

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Coal fly ashes (COFA) are readily available and reactive materials suitable for CO2 sequestration due to their substantial alkali components. Therefore, the onsite collaborative technology of COFA disposal and CO2 sequestration in coal-fired power plants appears to have potential. This work provides an overview of the state-of-the-art research studies in the literature on CO2 sequestration via the mineralization of COFA. The various CO2 sequestration routes of COFA are summarized, mainly including direct and indirect wet carbonation, the synthesis of porous CO2 adsorbents derived from COFA, and the development of COFA-derived inert supports for gas-solid adsorbents. The direct and indirect wet carbonation of COFA is the most concerned research technology route, which can obtain valued Ca-based by-products while achieving CO2 sequestration. Moreover, the Al and Si components rich in fly ash can be adapted to produce zeolite, hierarchical porous nano-silica, and nano-silicon/aluminum aerogels for producing highly efficient CO2 adsorbents. The prospects of CO2 sequestration technologies using COFA are also discussed. The objective of this work is to help researchers from academia and industry keep abreast of the latest progress in the study of CO2 sequestration by COFA.

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“…The use of combustion products in CO 2 mineralization concerns mainly ash from conventional boilers fed with lignite [ 17 , 18 ], petroleum coke blended with coal [ 19 , 20 ], a number of wastes [ 21 , 22 , 23 ] and coal of an undetermined rank [ 24 , 25 , 26 , 27 , 28 , 29 ].…”

Section: Introductionmentioning

confidence: 99%

“…The main routes of carbon dioxide mineralization with the use of a waste-derived alkaline earth metal source include direct wet carbonation, with carbon dioxide dissolved in water solution; indirect wet carbonation, with the chemical extraction (with the use of acids or ammonia salts solutions) of alkaline earth metal ions and carbonation of the resulting leachates; and direct dry carbonation in the gas–solid system. Most of the works on fly ash carbonation have been reported to use the complex and energy-demanding, two-stage indirect wet method [ 17 , 18 , 24 , 25 , 26 , 29 , 34 ] and some use the dry method with increased pressure and temperature, as well as optional steam dosing [ 21 , 22 , 23 , 27 , 30 , 35 , 36 ]. Reports on the dry carbonation method employed at ambient conditions are limited in their number, the scale of experiments and the parameters tested [ 27 ], with some recent exceptions in these terms [ 31 , 33 ].…”

Section: Introductionmentioning

confidence: 99%

Utilization of Carbon Dioxide and Fluidized Bed Fly Ash in Post-Industrial Land Remediation

et al. 2023

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The utilization of carbon dioxide and combustion products in cost- and energy-efficient technologies is an important element of creating sustainable energy systems, particularly in the transition period towards carbon neutrality and in light of the latest political developments, when solid fuels are still competing for a dominant role in securing energy supplies. Within the study presented, bituminous coal-derived fluidized bed fly ash samples of high calcium content, treated using a dry carbonation method under ambient conditions, were tested in terms of their specific properties to determine their usability in the preparation of injection mixtures for the filling of voids after shallow mining activities and other selected geo-engineering techniques. The study goes beyond the existing literature in terms of the carbonation method used, alkaline earth metal source, scale of the experiment, process conditions employed and product application studied. The results showed that the bituminous coal-derived fluidized bed fly ash, carbonated using the direct method adopted, may be successfully employed as the main solid component (over 82% w/w) of the injection mixtures for filling voids after shallow mining activities. The achievable compressive strength of a few MPa makes these materials applicable also in terms of ground strengthening in case it is required in light of the expected land development options to be employed. All principal materials used in the injection mixtures developed (carbonated fluidized bed fly ash, carbon dioxide, bottom ash) are industrial waste, and the carbonation method employed is simple and performed under ambient conditions, which reduces the required energy and cost input of filling mixture production, avoids the surface waste storage requirements, and contributes to the development of low energy-intensive carbon dioxide utilization and solid waste valorization methods.

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CO<sub>2</sub> Sequestration by Indirect Carbonation of High-Calcium Coal Fly Ash

Cited by 8 publications

References 10 publications

A Novel Method for CO₂ Sequestration via Indirect Carbonation of Coal Fly Ash

A Novel Method for CO₂ Sequestration via Indirect Carbonation of Coal Fly Ash

A Review on CO2 Sequestration via Mineralization of Coal Fly Ash

Utilization of Carbon Dioxide and Fluidized Bed Fly Ash in Post-Industrial Land Remediation

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CO<sub>2</sub> Sequestration by Indirect Carbonation of High-Calcium Coal Fly Ash

Cited by 8 publications

References 10 publications

A Novel Method for CO2 Sequestration via Indirect Carbonation of Coal Fly Ash

A Novel Method for CO2 Sequestration via Indirect Carbonation of Coal Fly Ash

A Review on CO2 Sequestration via Mineralization of Coal Fly Ash

Utilization of Carbon Dioxide and Fluidized Bed Fly Ash in Post-Industrial Land Remediation

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Product

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A Novel Method for CO₂ Sequestration via Indirect Carbonation of Coal Fly Ash

A Novel Method for CO₂ Sequestration via Indirect Carbonation of Coal Fly Ash