A study of densified biochar as carbon source in the silicon and ferrosilicon production
Open accessAbstract
Biochar pellets were investigated as renewable reducing agents in substitution of coal and coke in the silicon and ferrosilicon production, where a high reactivity, good mechanical properties and low feedstock costs are appreciated. The usage of pyrolysis oil as binder was investigated as way to improve the quality of the pellets. Norway spruce biochar produced at 500, 800 and 1100 °C, was pelletized blended with pyrolysis oil and lignosulphonate. A second heat treatment was carried out at the same temperatures to evaluate the interaction between biochar and pyrolysis oil and to imitate the thermal stability of the pellets when used in a furnace. Density, tensile strength and mechanical durability were analyzed before and after the second heat treatment. The CO2 reactivity was investigated under non-steady conditions. It was observed that the pellet quality is affected by the pyrolysis temperature, showing a relevant difference in properties between 500 °C and 800 °C. The combination of lignosulphonate and pyrolysis oil improved considerably the density and mechanical durability of the pellets. By the second heat treatment, the quality of the pellets was bettered significantly. Densification seems to reduce CO2 reactivity; however, pellets showed a still high reactivity.
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Through pelletizing, the bulk density of biochar is increased and the material is aggregated, thus reducing logistics costs.
“Through pelletizing, the bulk density of biochar is increased and the material is aggregated, thus reducing the logistics (i.e., transportation, storage, handling, and field application) costs [16,17].”
From Lifecycle Assessment and Techno-Economic Analysis of Biochar Pellet Production from Forest Residues and Field Application (2022) · cites this paper as [17]
The Introduction says pelletization generally increases density and mechanical durability, helping address losses during handling and transportation. It also discusses minimizing transportation costs, but the paper measures pellet particle density rather than bulk density and does not establish reduced storage or field-application costs; its application is silicon and ferrosilicon production. (LLM, conf=0.86)
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- Authors
- Riva, L., Surup, G. R., Buø, T. V., & Nielsen, H. K.
- Affiliations
- University of Agder (NO)
- Corresponding author
- Riva, Lorenzo
- Venue
- Energy
- Publisher
- Elsevier BV
- Published
- 2019-08
- Volume
- 181
- Pages
- 985-996
- ISSN
- 0360-5442 (ISSN-L)
- OpenAlex
- W2951798161
- Cited by
- 55
- References
- 36
- Citations by year
- 2026: 5 · 2025: 10 · 2024: 6 · 2023: 7 · 2022: 7 · 2021: 7 · 2020: 10 · 2019: 3
- FWCI
- 3.80
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Energy (publishedVersion, cc-by)
- RePEc: Research Papers in Economics (submittedVersion)
- NORA - Norwegian Open Research Archives (submittedVersion, cc-by)
- Topics
- Physical Sciences › Engineering › Mechanical Engineering › Iron and Steelmaking Processes
- Physical Sciences › Engineering › Biomedical Engineering › Thermochemical Biomass Conversion Processes
- Physical Sciences › Energy › Fuel Technology › Coal and Coke Industries Research
- Keywords
- silicon production, ferrosilicon production, reducing agents, lignosulfonate, Norway spruce, pyrolysis temperature, pellet densification, mechanical durability, CO2 reactivity, renewable binders
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Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
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