Direct aqueous mineral carbonation of carbide slag in a bubble column reactor under ambient conditions

Li, Weiling; Chen, Genglin; Zhang, Fangfang; Sun, Jian

doi:10.1016/j.seppur.2023.123932

Cited by 8 publications

(4 citation statements)

References 47 publications

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“…This was related to the impurity components (point defects) in the aqueous solution. In direct water carbonation, CaCO 3 crystallized as the most thermodynamically stable calcite, which matched the results from the literature [30]. However, in the acid synthesis system, two crystal forms of vaterite and calcite appeared.…”

Section: Effect Of Co 2 Mineralizationsupporting

confidence: 88%

“…The indirect mineralization process has attracted much attention due to its mild conditions and high mineralization efficiency [ 28 , 29 ]. Li et al used a bubble column reactor for direct aqueous mineral carbonation of carbide slag [ 30 ]. Aqueous mineral carbonation is limited by the low purity of the product, resulting in low economic benefits [ 31 , 32 ].…”

Section: Introductionmentioning

confidence: 99%

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Research on Utilizable Calcium from Calcium Carbide Slag with Different Extractors and Its Effect on CO2 Mineralization

Ma,

Zhang,

et al. 2024

Materials

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With the increasing accumulation of alkaline industrial solid waste, the mineralization of CO2 using alkaline industrial solid waste has broad application prospects. Carbide slag is highly alkaline and contains a large amount of calcium elements, making it an excellent material for CO2 mineralization. Our idea was to acquire qualified products and fast kinetics by integrating carbide slag utilization and carbon reduction. The reaction route was divided into two steps: calcium extraction and carbonization. In order to achieve efficient extraction of utilizable calcium, we selected NH4Ac as the extraction agent, which has the advantage of buffer protection and environmental friendliness due to being an acetate radical. The extraction efficiency of utilizable calcium exceeded 90% under the conditions of L/S 20:1 and NH4+/Ca2+ 2:1. In the carbonization process, the crystal forms of CaCO3 synthesized by direct carbonation, acid extraction, and ammonium salt were characterized. The formation mechanism of vaterite in ammonium solution and the influence of impurities (Al3+, Mg2+) on the crystal transformation were revealed. This study provides technical support for using alkaline industrial waste to prepare high-purity vaterite. Therefore, alkaline industrial waste can be efficiently and sustainably utilized through CO2 mineralization.

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Section: Effect Of Co 2 Mineralizationsupporting

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Research on Utilizable Calcium from Calcium Carbide Slag with Different Extractors and Its Effect on CO2 Mineralization

Ma,

Zhang,

et al. 2024

Materials

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“…Zhang et al 9 selected solid wastes such as carbide slag and steel slag to evaluate the CO 2 mineralization performance and verified the effectiveness of MEA in solving the problem of slow Ca 2+ leaching rate in solid wastes, but the addition of MEA did not improve the fixed CO 2 of carbide slag significantly (86.2 gCO 2 /kg carbide slag). Li et al 10 used carbide slag to directly mineralize CO 2 through the bubble column reactor and explored the effects of the solid−liquid ratio and gas flow rate on the reaction. Zhang et al 11 found positive effects of O 2 /H 2 O high-concentration steam on CO 2 recovery from carbide slag, but it requires a lot of energy and is not applicable to permanently sequester CO 2 .…”

Section: Introductionmentioning

confidence: 99%

Accelerated Direct Mineralization of CO₂ by Carbide Slag under Ambient Temperature and Pressure Reaction Conditions

Lu,

Wang,

Zhang

et al. 2024

Energy Fuels

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With the proposal of double carbon targets in several countries, Carbon Capture and Storage (CCS) technology for large-scale CO 2 sequestration is receiving increasing attention. Alkaline solid waste carbide slag is a cheap and adequate raw material for CCS. Based on the control steps of the mineralization reaction for CO 2 fixation by carbide slag, a stepwise enhanced strategy for wet mineralization sealing under normal reaction conditions was devised to efficiently improve CO 2 mineralization and byproduct CaCO 3 content. Specifically, we introduced calcination to change the surface morphology of the carbide slag and then utilized agitation to improve the solid−liquid consistency and enhance the dissolution of the carbide slag and the leaching of Ca 2+ . Ultrasound and magnetic stirring cause the carbide slurry to vibrate, shock, and disperse violently so that the calciumcontaining phase releases more Ca 2+ into the reaction system and promotes CO 2 mineralization. However, it is possible that ultrasonic waves to some extent destroyed the CaCO 3 released from the carbide slag to form an encapsulating layer on the surface, allowing more Ca 2+ reactions and better performance of CO 2 capture and CO 2 mineralization efficiency under ultrasonic conditions. The addition of NaOH solution affected the generation of carbonate and the mineralization reaction, which resulted in a CO 2 mineralization efficiency of 86.7% (637 kg CO 2 /tonne of slag), a calcium mineralization product with a purity of 94.1%, and a particle size of about 100 μm under the conditions of 300 W, 25 °C, and 1 M concentration. This technology progressively enhances the process of fixing CO 2 by wetting the carbide slag with the byproduct of CaCO 3 .

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“…To realize the high CO 2 absorption efficiency, many researchers have tried to apply different reactors, such as continuous tubular reactors, autoclave reactors, high-gravity rotating packed beds, and bubble columns. [16][17][18][19] But most of these reactors have high energy consumption, making them unsuitable for large-scale industrial applications. Different from them, the spray tower reactor with low cost, low pressure drop, and not easy to be clogged, 20,21 is ideal industrial mineralization equipment, thus it has been widely used in the treatment of sulfur-containing flue gas.…”

Section: Introductionmentioning

confidence: 99%

Gas and slurry flow behaviors in a CO₂‐mineralization spray tower reactor

Liu,

Wang,

Zhou

et al. 2023

AIChE Journal

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The spray tower reactors have provided an important solution for the scale‐up of mineralization processes with industrial solid waste to absorb CO2. In this study, numerical simulations were employed to investigate the fluid flow behaviors in a mineralization spray tower reactor (MSTR), and the average relative error of simulation and experimental results was 7.5%. The results showed that at a high liquid–gas ratio (L/G > 100 L/m3), the fluid flow behavior was dominated by the slurry flow, which was only hindered by the gas flow to a certain extent at the gas inlet. Further analysis revealed that the accumulation of slurry at the center and wall of the reactor, as well as the bias flow of flue gas, were the main reasons for the insufficient gas–liquid contact, which led to a lower CO2 absorption efficiency. The relationship between fluid flow behavior and CO2 absorption efficiency could improve the understanding of the MSTRs.

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Direct aqueous mineral carbonation of carbide slag in a bubble column reactor under ambient conditions

Cited by 8 publications

References 47 publications

Research on Utilizable Calcium from Calcium Carbide Slag with Different Extractors and Its Effect on CO2 Mineralization

Research on Utilizable Calcium from Calcium Carbide Slag with Different Extractors and Its Effect on CO2 Mineralization

Accelerated Direct Mineralization of CO₂ by Carbide Slag under Ambient Temperature and Pressure Reaction Conditions

Gas and slurry flow behaviors in a CO₂‐mineralization spray tower reactor

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Direct aqueous mineral carbonation of carbide slag in a bubble column reactor under ambient conditions

Cited by 8 publications

References 47 publications

Research on Utilizable Calcium from Calcium Carbide Slag with Different Extractors and Its Effect on CO2 Mineralization

Research on Utilizable Calcium from Calcium Carbide Slag with Different Extractors and Its Effect on CO2 Mineralization

Accelerated Direct Mineralization of CO2 by Carbide Slag under Ambient Temperature and Pressure Reaction Conditions

Gas and slurry flow behaviors in a CO2‐mineralization spray tower reactor

Contact Info

Product

Resources

About

Accelerated Direct Mineralization of CO₂ by Carbide Slag under Ambient Temperature and Pressure Reaction Conditions

Gas and slurry flow behaviors in a CO₂‐mineralization spray tower reactor