Safe use of electric arc furnace dust as secondary raw material in self-compacting mortars production

Lozano-Lunar, Angélica; Silva, Pedro Raposeiro Da; Brito, Jorge de; Fernández, José Antonio Fernández; Jiménez, José Ramón

doi:10.1016/j.jclepro.2018.12.002

Cited by 41 publications

(20 citation statements)

References 46 publications

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“…These facts were in accordance with Figure 11 (XRD patterns), in which the compressive strength behaviour of mortars could be attributed to the formation of the Portlandite phase [ 15 , 18 , 20 ], since this phase only appeared in mortars with good mechanical properties (RM, EAFD25, and EAFD25_H2) and was not present in EAFD25_H1 or EAFD25_H3. These results were in agreement with those in Ledesma et al [ 15 , 18 ] and Lozano-Lunar et al [ 20 ] who showed that Portlandite (Ca(OH) 2 ) was formed due to the extension of the Portland cement reaction. Hydrotalcite, due to its acid-base characteristics, to a greater or lesser extent, inhibits the hydration reaction of cement, which translates into a minor amount or absence of Portlandite (Ca(OH) 2 ).…”

Section: Resultssupporting

confidence: 89%

“…The presence of franklinite and zincite was related to the observed Zn content, which was higher than the stoichiometric ratio of Zn and Fe in the spinel [ 18 ]. Although EAFD composition depended on the scrap metal [ 2 ], the XRD results of EAFD were in agreement with those obtained by Suetens et al [ 48 ] and Lozano-Lunar et al [ 20 ].…”

Section: Resultssupporting

confidence: 86%

“…The major elements in EAFD were Zn and Fe at 41.58% and 18.31%, respectively. The amount of Pb was of the same order as that found in the information contributed by other authors ( Figure 1 ) [ 1 , 2 , 20 , 43 ].…”

Section: Resultssupporting

confidence: 81%

“…The main phases were franklinite (ZnFe 2 O 4 ) and zincite (ZnO). In addition, metallic Mn, such as MnO, quartz (SiO 2 ), and PbO 2 were also detected [ 20 ].…”

Section: Resultsmentioning

confidence: 99%

“…The authors concluded that the fixing mechanisms of Pb are not sufficiently known and the use of cement-based materials could be a limiting factor for Pb immobilisation [ 19 ]. A recent study carried out by Lozano-Lunar et al [ 20 ] achieved Pb immobilization with highly alkaline cement-based materials. In their investigation, Pb release remained below the established limit by the European Council Decision 2003/33/EC [ 21 ] due to the dense matrix used in the study.…”

Section: Introductionmentioning

confidence: 99%

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A Double Barrier Technique with Hydrotalcites for Pb Immobilisation from Electric Arc Furnace Dust

et al. 2019

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A new line of mortars incorporating hydrotalcites was developed. This research article shows the results of a study of a double barrier technique (DBT) for Pb immobilisation from electric arc furnace dust (EAFD) in mortars with the addition of three different hydrotalcites (H1, H2, and H3). Electric arc furnace dust (EAFD) is a hazardous waste due to its heavy metal leachability. The aim was to obtain a mortar in which, due to its chemical composition, heavy metal leaching satisfied environmental criteria. Previously, a physical and chemical characterisation of mortar material components was carried out. The leaching behaviour of Pb from EAFD in double barrier (DB) mortars with different hydrotalcites was analysed for compressive strength to determine treatment effectiveness. DB mortars could be considered monoliths because their compressive strengths were higher than 1 MPa but exhibited a decrease due to hydrotalcite incorporation. The mortar EAFD25_H2 (with ethylenediaminetetraacetate (EDTA) in the interlayer of the hydrotalcite) showed one minor reduction in compressive strength with respect to the reference mortar because formation of Portlandite was observed, which is a characteristic of cement hydration. The conventional immobilisation mortar (EAFD25) did not achieve Pb immobilisation. However, DB mortars with dimercaptosuccinate (DMSA) in the interlayer of the hydrotalcite reduced Pb release by ~50%, from 20.29 mg kg−1 (EAFD25) to 9.88 mg kg−1 (EAFD25_H3). In addition, EAFD25_H3 included the lowest hydrotalcite content, thereby improving the immobilisation ratio. The results of this study contribute to better Pb immobilisation, thus satisfying environmental criteria.

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Section: Resultssupporting

confidence: 89%

Section: Resultssupporting

confidence: 86%

Section: Resultssupporting

confidence: 81%

“…The main phases were franklinite (ZnFe 2 O 4 ) and zincite (ZnO). In addition, metallic Mn, such as MnO, quartz (SiO 2 ), and PbO 2 were also detected [ 20 ].…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Double Barrier Technique with Hydrotalcites for Pb Immobilisation from Electric Arc Furnace Dust

et al. 2019

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Digitalization for circular economy and operational excellence practices: A paradox theory perspective on performance improvement in manufacturing firms

Prashar,

Chaudhuri

2024

Bus Strat Env

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The present study evaluates how the joint implementation of circular economy (CE) and operational excellence (OE) practices supported by the adoption of industry 4.0 technologies (Internet of Things and Big Data Analytics) influence manufacturing firms' operational performance and environmental sustainability. Drawing from the paradox theory, it also investigates the moderating role of managing paradoxical tensions arising from these implementations. To test the hypothesized relationships, survey data are collected from 147 Indian manufacturing firms implementing CE, OE practices, and internet of things (IoT) and big data analytics (BDA)‐enabled digital systems. The data are analyzed using structural equation modeling and moderated mediation analysis. Results indicate a direct significant effect of adoption of IoT and BDA‐enabled digital systems on operational performance and environmental sustainability, and partial mediation by CE and OE implementations, respectively. There is a strong moderation of managing paradoxical tensions on the impact of CE and OE implementations on performance. Additionally, the conditional indirect effect of CE implementations on the environmental sustainability outcomes of the IoT and BDA adoption increases with greater effort in managing paradoxical tensions. The study answers the call for empirical research on the organizational tensions that surface due to conflicting demands of initiatives related to operational efficiency and environmental sustainability.

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New Factors of Reliability of Electric Furnaces for Vermiculite Firing with Mobile Base Plates

Нижегородов

Gavrilin

Moyzes

et al. 2021

Progress in Material Science and Engineering

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Safe use of electric arc furnace dust as secondary raw material in self-compacting mortars production

Cited by 41 publications

References 46 publications

A Double Barrier Technique with Hydrotalcites for Pb Immobilisation from Electric Arc Furnace Dust

A Double Barrier Technique with Hydrotalcites for Pb Immobilisation from Electric Arc Furnace Dust

Digitalization for circular economy and operational excellence practices: A paradox theory perspective on performance improvement in manufacturing firms

New Factors of Reliability of Electric Furnaces for Vermiculite Firing with Mobile Base Plates

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