Accelerated Carbonation of Ca- and Mg-Bearing Minerals and Industrial Wastes Using CO2

Gadikota, Greeshma; Park, Ah-hyung Alissa

doi:10.1016/b978-0-444-62746-9.00008-6

Cited by 53 publications

(70 citation statements)

References 62 publications

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“…The transition to a low carbon economy will require us to develop a portfolio of technologies for capturing, utilizing, and storing CO 2 at the gigaton scale [5]. Carbon mineralization is one approach which involves the accelerated conversion and storage of CO 2 as water insoluble calcium and magnesium carbonate via thermodynamically downhill routes [6][7][8][9][10][11][12]. Various routes including gas-solid and gas-liquid-solid reaction routes have been explored to accelerate the conversion of CO 2 to calcium and magnesium carbonates [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…One of the key motivations for investigating the phase transitions and textural changes of calcium hydroxide during carbon mineralization is the abundance of these materials in alkaline industrial residues including coal fly ash, steel slag, and red mud [8] and less studied wastes such as carbide slag residues [16] which have been reported to have more than 90% calcium hydroxide in the dry state. Carbide slag is one of the byproducts of the hydrolysis of calcium carbide (CaC 2 ), a reaction generating ethylene, polyvinyl chloride (PVC), and other products in the industry [17].…”

Section: Introductionmentioning

confidence: 99%

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Phase Evolution and Textural Changes during the Direct Conversion and Storage of CO2 to Produce Calcium Carbonate from Calcium Hydroxide

Liu

Gadikota

2018

Geosciences

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The increasing use of energy resources recovered from subsurface environments and the resulting carbon imbalance in the environment has motivated the need to develop thermodynamically downhill pathways to convert and store CO 2 as water-insoluble calcium or magnesium carbonates. While previous studies extensively explored aqueous routes to produce calcium and magnesium carbonates from CO 2 , there is limited scientific understanding of the phase evolution and textural changes during the direct gas-solid conversion routes to produce calcium carbonate from calcium hydroxide, which is one of the abundant constituents of alkaline industrial residues. With increasing interest in developing integrated pathways for capturing, converting, and storing CO 2 from dilute flue gases, understanding the composition of product phases as they evolve is essential for evaluating the efficacy of a given processing route. Therefore, in this study, we investigate the phase evolution and the corresponding textural changes as calcium hydroxide is converted to calcium carbonate under the continuous flow of CO 2 at an ambient pressure of 1 atm with continuous heating from 30 • C to 500 • C using in-operando wide angle X-ray scattering (WAXS), small angle X-ray scattering (SAXS), and ultrasmall angle X-ray scattering (USAXS) measurements.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Phase Evolution and Textural Changes during the Direct Conversion and Storage of CO2 to Produce Calcium Carbonate from Calcium Hydroxide

Liu

Gadikota

2018

Geosciences

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“…Up to now, research has suggested that the optimum product in chemical activation on magnesium silicates is sulfuric acid-treated serpentine, which is a mesopore product with a specific surface area of 330 m 2 /g [22]. A number of papers on the chemical and morphological changes as a result of CO2 interactions with olivine have been published [23][24][25][26][27]. However, mineral-based sorbents are rarely tested in the VSA process [28].…”

Section: Introductionmentioning

confidence: 99%

Carbon Dioxide Sorption Isotherm Study on Pristine and Acid-Treated Olivine and Its Application in the Vacuum Swing Adsorption Process

Hitch

2015

Minerals

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This paper investigates the potential of pristine and acid-treated olivine as a substrate for CO2 capture using a vacuum swing adsorption (VSA) process from the gas-solid phase. The experiments tested the isotherm of pure CO2 adsorption with partial pressure from 10 −5 to 1 bar at ambient temperature. The CO2 adsorption capacity and actual expected working capacity (EWC) curves of pristine and acid-treated olivine were determined. Isotherm studies predict that physisorption dominates chemisorptions at ambient temperatures. The adsorption capacity enhances with the increase of specific surface area, pore volume, and the appearance of Mg complexed on the mineral's surface. Actual EWC studies showed that acid-treated olivine is an adsorbent choice for the VSA process, due to enhanced CO2 adsorption capacities compared to olivine and the potential for 100% recovery of CO2 during the regeneration process. Pristine olivine is not suitable for the VSA process because of bad regenerability, but it can be used in capturing and sequestering dilute CO2 in process streams. Our research reveals excellent viability for the application of VSA in the area of CO2 capture using pristine olivine and acid-treated olivine.

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“…Carbon mineralization, which involves the conversion of CO 2 to carbonates that are thermodynamically stable, environmentally benign, and insoluble in water, has been proposed as a pathway to safely and permanently store CO 2 via natural and engineered pathways [1][2][3][4][5][6][7][8][9][10]. While various earth-abundant calcium and magnesium silicates have been extensively investigated for the permanent storage of CO 2 [3][4][5]7,11,12] given their availability in nature [13][14][15], there is an increasing interest in the scalable synthesis of alternative carbonates such as lithium carbonates.…”

Section: Introductionmentioning

confidence: 99%

Connecting the Morphological and Crystal Structural Changes during the Conversion of Lithium Hydroxide Monohydrate to Lithium Carbonate Using Multi-Scale X-ray Scattering Measurements

Gadikota

2017

Minerals

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While CO 2 storage technologies via carbon mineralization have focused on the use of earth-abundant calcium-and magnesium-bearing minerals, there is an emerging interest in the scalable synthesis of alternative carbonates such as lithium carbonate. Lithium carbonate is the carbonated end-product of lithium hydroxide, a highly reactive sorbent for CO 2 capture in spacecraft and submarines. Other emerging applications include tuning the morphology of lithium carbonates synthesized from the effluent of treated Li-bearing batteries, which can then be reused in ceramics, glasses, and batteries. In this study, in operando Ultra-Small-Angle, Small-Angle, and Wide-Angle X-ray Scattering (USAXS/SAXS/WAXS) measurements were used to link the morphological and crystal structural changes as lithium hydroxide monohydrate is converted to lithium carbonate. The experiments were performed in a flow-through reactor at P CO 2 of 1 atm and at temperatures in the range of 25-500 • C. The dehydration of lithium hydroxide monohydrate to form lithium hydroxide occurs in the temperature range of 25-150 • C, while the onset of carbonate formation is evident at around 70 • C. A reduction in the nanoparticle size and an increase in the surface area were noted during the dehydration of lithium hydroxide monohydrate. Lithium carbonate formation increases the nanoparticle size and reduces the surface area.

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Accelerated Carbonation of Ca- and Mg-Bearing Minerals and Industrial Wastes Using CO2

Cited by 53 publications

References 62 publications

Phase Evolution and Textural Changes during the Direct Conversion and Storage of CO2 to Produce Calcium Carbonate from Calcium Hydroxide

Phase Evolution and Textural Changes during the Direct Conversion and Storage of CO2 to Produce Calcium Carbonate from Calcium Hydroxide

Carbon Dioxide Sorption Isotherm Study on Pristine and Acid-Treated Olivine and Its Application in the Vacuum Swing Adsorption Process

Connecting the Morphological and Crystal Structural Changes during the Conversion of Lithium Hydroxide Monohydrate to Lithium Carbonate Using Multi-Scale X-ray Scattering Measurements

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