Valorization of electric arc furnace primary steelmaking slags for cement applications

Kim, Hyung Seok; Kim, Kee Seok; Jung, Sung Suk; Hwang, Jin Ill; Choi, Jae Seok; Sohn, Il

doi:10.1016/j.wasman.2015.03.019

Cited by 48 publications

(13 citation statements)

References 18 publications

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“…It can be observed that the sample mass started to decrease at relatively low temperatures (~770 °C) under Ar gas, indicating that the Fe x O y in steel slags was reduced by the carbon in biomass char. This, in fact, accounts for one of the important iron recovery approaches from steel slags, i.e., direct reduction 36 37 . This phenomenon also indicated that, from the viewpoint of Fe x O y reduction in steel slags, biomass char showed a higher reaction activity than coal char.…”

Section: Resultsmentioning

confidence: 99%

“…5e–g . The sample mass started to decrease at relatively low temperatures (~850 °C) under Ar gas, which indicated that the Fe 2 O 3 in hematite was reduced by the coal char, accounting for one of the traditional direct iron-making approaches 36 37 . In other words, from the viewpoint of Fe x O y reduction by coal char, the hematite presented a higher activity than steel slags.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

A Fe-C-Ca big cycle in modern carbon-intensive industries: toward emission reduction and resource utilization

Sun

Sridhar

Seetharaman

et al. 2016

Sci Rep

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Herein a big Fe-C-Ca cycle, clarifying the basic element flows and energy flows in modern carbon-intensive industries including the metallurgical industry and the cement industry, was proposed for the first time in the contexts of emission reduction and iron ore degradation nowadays. This big cycle was focused on three industrial elements of Fe, C and Ca and thus it mainly comprised three interdependent loops, i.e., a C-cycle, a Fe-cycle and a Ca-path. As exemplified, we started from the integrated disposal of hot steel slags, a man-made iron resource via char gasification and the employment of hematite, a natural iron resource greatly extended the application area of this idea. Accordingly, based on this concept, the theoretical potentials for energy saving, emission reduction and Fe resource recovery achieved in modern industry are estimated up to 7.66 Mt of standard coal, 63.9 Mt of CO2 and 25.2 Mt of pig iron, respectively.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

A Fe-C-Ca big cycle in modern carbon-intensive industries: toward emission reduction and resource utilization

Sun

Sridhar

Seetharaman

et al. 2016

Sci Rep

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“…Kim et al [27] argumentan que las EHAE, que contienen más del 20% en peso de FeO, tienen un uso limitado como material suplementario para cemento. Debido a lo anterior, los autores realizaron un estudio sobre la fabricación de escoria disminuyendo el contenido de FeO por medio de un proceso de dos etapas, que incluía una reacción con residuo de Aluminio seguida de la reducción directa de carbono.…”

Section: Reemplazo De Cementounclassified

Uso de las escorias de horno de arco eléctrico (EHAE) en la construcción – estado del arte

Rojas-Manzano¹,

Otálvaro-Calle²,

Pérez-Caicedo³

et al. 2021

Rev. UIS ing.

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El aumento de la población mundial ha tenido como consecuencia el crecimiento de la industria de la construcción. Lo anterior, implica la explotación de recursos naturales no renovables y por ende un mayor impacto ambiental por la contaminación del suelo, el agua y el aire. Así, el desarrollo sostenible se ha convertido en una prioridad en la industria, por ejemplo, por medio de la incorporación de residuos en la cadena productiva. El acero puede producirse por dos métodos: el alto horno (se funden minerales de hierro) y el horno de arco eléctrico (se funde chatarra metálica reciclada). En este último, el proceso más utilizado en Colombia, se forma la escoria horno de arco eléctrico (EHAE). Este residuo representa una oportunidad de aprovechamiento en la construcción. Varias investigaciones han estudiado el uso de este material como agregado y como materia prima del cemento. Así mismo, su utilización como sustituto de material granular en la construcción de terraplenes, bases, subbases y capas de rodadura, siendo en el área de pavimentos donde mayor aplicación puede darse a la escoria. Este trabajo tiene como objetivo realizar una revisión actualizada del estado del arte sobre el uso de la EHAE en la construcción, para promover la implementación correcta y segura de este residuo y aportar a la sostenibilidad de la industria siderúrgica.

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“…For the case of EAF slag, its properties render it a good candidate for many engineering applications, including as a (heavyweight) aggregate for concrete, as radiation-shielding concrete, as an environmentally friendly substitute of natural aggregates such as barite, hematite or limonite [12]. Nevertheless, although the approach of EAF slag utilization in the final stage of cement manufacturing as clinker substitute similar to the exploitation of blast furnace slag has been limited researched [13][14][15] it has not been usually practiced, mostly due to its weak hydraulic properties [16]. Further, steel slag is not currently included in the European Norm in force for the types of cements [17].…”

Section: Introductionmentioning

confidence: 99%

Valorization of Slags Produced by Smelting of Metallurgical Dusts and Lateritic Ore Fines in Manufacturing of Slag Cements

et al. 2020

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A pyrometallurgical process was developed for the recycling of Ni bearing dusts and laterite ore fines by direct reduction smelting in DC (direct current) arc furnace. In the course of the performed industrial trials, besides the Ni-recovery in the liquid bath, slag composition was deliberately adjusted in order to produce a series of metallurgical slags with different chemical and mineralogical composition. The aim of this study was to investigate their suitability as clinker substitute in cement manufacturing. Examined parameters were slag FeOx content, basicity and applied cooling media (air, water cooling). A series of composite Portland and slag cements were manufactured in laboratory scale incorporating 20% and 40% of each slag, respectively; the rest being clinker of OPC (ordinary Portland cement) and 5% gypsum. The extended mineralogical analysis and microstructural properties of the produced slags were examined and correlated with the properties of the produced cements. The physical and mechanical characteristics of all examined cement products were found to meet the requirements of the regulation set for cements. The present research revealed that the most critical parameter in the compressive strength development of the slag cements is the mineralogical composition of the slag. Even in cases where rapid cooling to obtain glassy matrix is not feasible, adjustment of slag analysis to obtain mineralogical phases similar to those met in clinker of OPC, even at higher FeO contents (up to ~21wt.%), can result in production of slag with considerable latent hydraulic properties. These results indicate that there is potentially space for adjustments in conventional EAF (electric arc furnace) steel slags composition to allow for their wider use in cement manufacturing with significant environmental and economic benefits resulting from the reduction of energy requirements, CO2 emissions and natural raw materials consumption.

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Valorization of electric arc furnace primary steelmaking slags for cement applications

Cited by 48 publications

References 18 publications

A Fe-C-Ca big cycle in modern carbon-intensive industries: toward emission reduction and resource utilization

A Fe-C-Ca big cycle in modern carbon-intensive industries: toward emission reduction and resource utilization

Uso de las escorias de horno de arco eléctrico (EHAE) en la construcción – estado del arte

Valorization of Slags Produced by Smelting of Metallurgical Dusts and Lateritic Ore Fines in Manufacturing of Slag Cements

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