Investigation of the Impact of Biochar Application on Foaming Slags with Varied Compositions in Electric Arc Furnace-Based Steel Production

Kieush, Lina; Schenk, Johannes

doi:10.3390/en16176325

Cited by 5 publications

(3 citation statements)

References 48 publications

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“…A mix of biochar with coke, supplemented with FeO, ranging from 15 wt.% to 40 wt.%, resulted in stable foaming [40].…”

Section: Biochar Substitution In the Electric Arc Furnacementioning

confidence: 99%

Potential and Environmental Benefits of Biochar Utilization for Coal/Coke Substitution in the Steel Industry

Al Hosni,

Domini,

Vahidzadeh

et al. 2024

Energies

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The metallurgical sector is one of the most emission- and energy-intensive industries. The possibility of using fossil carbon substitutes has been investigated to reduce the environmental impact of the steelmaking sector. Among others, biochar emerged as a promising fossil coal/coke substitute. We conducted a literature review on biochar use in the metallurgical sector and its potential environmental benefits. The possibility for biochar as a coal/coke substitute is influenced by the source of biochar production and the process within which it can be used. In general, it has been observed that substitution of biochar ranging from a minimum of 5% to a maximum of 50% (mostly around 20–25%) is possible without affecting, or in some cases improving, the process, in coke making, iron sintering, blast furnaces and electric furnaces application. In some studies, the potential CO2 reduction due to biochar use was estimated, ranging from 5% to about 50%. Despite there still being an area of further investigation, biochar appeared as a promising resource with a variety of uses in the metallurgical sector, contributing to the lowering of the environmental impact of the sector.

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“…A mix of biochar with coke, supplemented with FeO, ranging from 15 wt.% to 40 wt.%, resulted in stable foaming [40].…”

Section: Biochar Substitution In the Electric Arc Furnacementioning

confidence: 99%

Potential and Environmental Benefits of Biochar Utilization for Coal/Coke Substitution in the Steel Industry

Al Hosni,

Domini,

Vahidzadeh

et al. 2024

Energies

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“…6 Foaming characteristics and measurement. Adopted from Kieush and Schenk ( 2023 ) (Open access without copyright permission requirement) …”

Section: Technical Feasibility and Adaptation Challengesmentioning

confidence: 99%

An overview of biochar production techniques and application in iron and steel industries

Ibitoye,

Loha,

Mahamood

et al. 2024

Bioresour. Bioprocess.

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Integrating innovation and environmental responsibility has become important in pursuing sustainable industrial practices in the contemporary world. These twin imperatives have stimulated research into developing methods that optimize industrial processes, enhancing efficiency and effectiveness while mitigating undesirable ecological impacts. This objective is exemplified by the emergence of biochar derived from the thermo-chemical transformation of biomass. This review examines biochar production methods and their potential applications across various aspects of the iron and steel industries (ISI). The technical, economic, and sustainable implications of integrating biochar into the ISI were explored. Slow pyrolysis and hydrothermal carbonization are the most efficient methods for higher biochar yield (25–90%). Biochar has several advantages- higher heating value (30–32 MJ/kg), more porosity (58.22%), and significantly larger surface area (113 m2/g) compared to coal and coke. However, the presence of biochar often reduces fluidity in a coal-biochar mixture. The findings highlighted that biochar production and implementation in ISI often come with higher costs, primarily due to the higher expense of substitute fuels compared to traditional fossil fuels. The economic viability and societal desirability of biochar are highly uncertain and vary significantly based on factors such as location, feedstock type, production scale, and biochar pricing, among others. Furthermore, biomass and biochar supply chain is another important factor which determines its large scale implementation. Despite these challenges, there are opportunities to reduce emissions from BF-BOF operations by utilizing biochar technologies. Overall, the present study explored integrating diverse biochar production methods into the ISI aiming to contribute to the ongoing research on sustainable manufacturing practices, underscoring their significance in shaping a more environmentally conscious future.

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“…The temperature was elevated to 1600 • C and held for 1 h to ensure complete melting. Following the foaming tests, liquid nitrogen was employed to rapidly cool and solidify the foam structure, after which it was allowed to naturally cool to ambient temperature [29][30][31].…”

Section: Bc5 G Bc10 Gmentioning

confidence: 99%

Biocoke Thermochemical Properties for Foamy Slag Formations in Electric Arc Furnace Steelmaking

Kieush,

Schenk,

Koveria

et al. 2023

Metals

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This paper is devoted to studying the thermochemical properties of carbon sources (laboratory-scale conventional coke, biocoke with 5 wt.%, and 10 wt.% wood pellet additions) and the influence of these properties on foamy slag formations at 1600 °C. Thermogravimetric analysis (TGA) conducted under air unveiled differences in mass loss among carbon sources, showing an increasing order of coke < biocoke with 5 wt.% wood pellets < biocoke with 10 wt.% wood pellets. The Coats–Redfern method was used to calculate and reveal distinct activation energies among these carbon sources. Slag foaming tests performed using biocoke samples resulted in stable foam formation, indicating the potential for biocoke as a carbon source to replace those conventionally used for this process. Slag foaming characters for biocoke with 5 wt.% wood pellets were improved more than coke. Using biocoke with 10 wt.% wood pellets was marginally worse than coke. On the one hand, for biocoke with 5 wt.% wood pellets, due to increased reactivity, the foaming time was reduced, but it was sufficient and optimal for slag foaming. Conversely, biocoke with 10 wt.% wood pellets reduced foaming time, proving insufficient and limiting the continuity of the foaming. This study highlights that thermochemical properties play a significant role, but comprehensive assessment should consider multiple parameters when evaluating the suitability of unconventional carbon sources for slag foaming applications.

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Investigation of the Impact of Biochar Application on Foaming Slags with Varied Compositions in Electric Arc Furnace-Based Steel Production

Cited by 5 publications

References 48 publications

Potential and Environmental Benefits of Biochar Utilization for Coal/Coke Substitution in the Steel Industry

Potential and Environmental Benefits of Biochar Utilization for Coal/Coke Substitution in the Steel Industry

An overview of biochar production techniques and application in iron and steel industries

Biocoke Thermochemical Properties for Foamy Slag Formations in Electric Arc Furnace Steelmaking

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