Experiment and kinetic modeling for leaching of blast furnace slag using ligand

Seo, Sang-Beom; Kwon, Chan-Min; Kim, Felix Sunjoo; Lee, Chul‐Jin

doi:10.1016/j.jcou.2018.07.015

Cited by 20 publications

(2 citation statements)

References 28 publications

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“…On the other hand, volatile organic acids (VOAs), which are often produced by the anaerobic digestion of biogenic wastes, have recently received attention as promising intermediates in biorefineries, providing the carbon resources required for manufacturing biofuels and bioplastics. − VOAs are known to include linear short-chain acids such as acetic acid (C 2 H 4 O 2 ), propionic acid (C 3 H 6 O 2 ), butyric acid (C 4 H 8 O 2 ), and valeric acid (C 5 H 10 O 2 ), as listed in Table . Acetic acid and propionic acid derived from VOAs are known to have a strong binding affinity with metal ions, and thus their potential as an extraction solvent has been suggested for the ex situ carbon mineralization process. − However, butyric acid, valeric acid, and their mixtures produced from biogenic wastes have not been discussed as extraction solvents in previous studies.…”

Section: Introductionmentioning

confidence: 99%

Integration of Two Waste Streams for Carbon Storage and Utilization: Enhanced Metal Extraction from Steel Slag Using Biogenic Volatile Organic Acids

Hong

Huang

Rim

et al. 2020

ACS Sustainable Chem. Eng.

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Among CO 2 fixation technologies, ex situ carbon mineralization using steel slag is a promising option since it produces thermodynamically stable solid carbonates. The utilization of carbonates produced using captured CO 2 can allow a new circular economy of carbon. Volatile organic acids (VOAs), which are produced in the anaerobic digestion of biogenic wastes, have recently received significant attention as promising intermediates in biorefinery and another circular economy of a waste stream. This study explored the integration of two circular economies of wastes by investigating the leaching behaviors of steel slag in the presence of biogenic waste-originated organic acids−acetic acid, propionic acid, butyric acid, valeric acid, and their mixtures. The organic acids were more efficient in the elemental extraction from steel slag than strong acids. Furthermore, their mixture showed the highest extraction efficiency for all elements, illustrating the synergetic effect of ligands with different sizes and stability constants. These findings demonstrate that organic acids obtained from the biogenic wastes can be directly employed for the extraction step of an ex situ carbon mineralization process without separation or purification steps. The direct use of both steel slag and waste organic acids will significantly improve the overall sustainability of the ex situ carbon mineralization technology.

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Section: Introductionmentioning

confidence: 99%

Integration of Two Waste Streams for Carbon Storage and Utilization: Enhanced Metal Extraction from Steel Slag Using Biogenic Volatile Organic Acids

Hong

Huang

Rim

et al. 2020

ACS Sustainable Chem. Eng.

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“…Hence, the carbonation of solid wastes provides a method for simultaneous CO 2 storage and waste disposal. Among various industrial wastes, waste gypsum, fly ash, steelmaking slag, and blast‐furnace slag (BFS) are receiving more attention because of their enormous resources and their high Ca and Mg content. However, the direct carbonation of BFS is difficult due to its non‐alkaline characteristic.…”

Section: Introductionmentioning

confidence: 99%

Indirect mineral carbonation of chlorinated tailing derived from Ti‐bearing blast‐furnace slag coupled with simultaneous dechlorination and recovery of multiple value‐added products

et al. 2018

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The chlorinated tailing (CT) generated during titanium extraction from Ti‐bearing blast‐furnace slag contains 3–5 wt% chlorides, which are hazardous to the environment. In this paper, a process for simultaneous CO2 mineralization, dechlorination, and recovery of multiple value‐added products was proposed to fully utilize the CT. In this process, Ti, Al, Mg, and Ca are extracted in the form of their sulfates via roasting with recyclable (NH4)2SO4 followed by leaching with dilute H2SO4. Their extraction ratios are 83.1%, 87.4%, 89.4%, and 92.1%, respectively. The chlorides are simultaneously removed from the CT as gaseous HCl with a dechlorination ratio of 98.5%. Subsequently, 89.5% of the Al and 97.5% of the Ti in the leaching liquor are successively recovered as NH4Al(SO4)2·12H2O with a purity of 99 wt% and titanium‐rich material with TiO2 of 62.5 wt%. The CaSO4‐rich leaching residue and MgSO4‐rich leachate, after complete depletion of the Al and Ti, are separately carbonated with a mixed gas of CO2 and NH3 with total CO2 capacity up to 279.8 kg CO2 per tonne CT. The preliminary economic evaluation shows that income from selling products after the deduction of the cost of primary raw materials reaches 200 $/tonne CT. The proposed route therefore provides a cost‐efficient alternative for comprehensive utilization of the polluting CT. © 2018 Society of Chemical Industry and John Wiley & Sons, Ltd.

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Utilization of mineral carbonation products: current state and potential

et al. 2019

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Mineral carbonation (MC) is a form of carbon capture and storage that reacts CO2 with alkaline feedstock to securely store CO2 as solid carbonate minerals. To improve process economics and accelerate commercial deployment, research has increased around product utilization, where markets exist primarily in the construction industry. This review assesses the potential for advancing MC product utilization to decrease CO2 emissions toward neutral, or even negative, values. First, the literature surrounding the current state and challenges for indirect MC processes is reviewed, indicating that process intensification and scale‐up are important areas for further research. Alkalinity sources available for MC are examined, differentiating between those sourced from industrial processes and mining operations. Investigation of possible end uses of carbonate products reveals that further CO2 avoidance can be achieved by replacing conventional carbon‐intensive products. Companies that are currently commercializing MC processes are categorized based on the feed used and materials produced. An analysis of company process types indicates that up to 3 GtCO2 year–1 could be avoided globally. It is suggested that upcoming commercial efforts should focus on the carbonation of industrial wastes located near CO2 sources to produce precast concrete blocks. Carbonation of conventional concrete shows the highest potential for CO2 avoidance, but may face some market resistance. Carbonation of Mg silicates lacks sufficient market demand and requires the development of new high‐value products to overcome the expense of mining and feed preparation. It is suggested that research focus on enhanced understanding of magnesia cement chemistry and the development of flame‐retardant mineral fillers. © 2019 The Authors. Greenhouse Gases: Science and Technology published by Society of Chemical Industry and John Wiley & Sons, Ltd.

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Experiment and kinetic modeling for leaching of blast furnace slag using ligand

Cited by 20 publications

References 28 publications

Integration of Two Waste Streams for Carbon Storage and Utilization: Enhanced Metal Extraction from Steel Slag Using Biogenic Volatile Organic Acids

Integration of Two Waste Streams for Carbon Storage and Utilization: Enhanced Metal Extraction from Steel Slag Using Biogenic Volatile Organic Acids

Indirect mineral carbonation of chlorinated tailing derived from Ti‐bearing blast‐furnace slag coupled with simultaneous dechlorination and recovery of multiple value‐added products

Utilization of mineral carbonation products: current state and potential

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