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Andersson, Anton
Publications (10 of 10) Show all publications
Andersson, A., Gullberg, A., Kullerstedt, A., Sandberg, E., Andersson, M., Ahmed, H., . . . Björkman, B. (2018). A Holistic and Experimentally-Based View on Recycling of Off-Gas Dust within the Integrated Steel Plant. Metals, 8(10), Article ID 760.
Open this publication in new window or tab >>A Holistic and Experimentally-Based View on Recycling of Off-Gas Dust within the Integrated Steel Plant
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2018 (English)In: Metals, ISSN 2075-4701, Vol. 8, no 10, article id 760Article in journal (Refereed) Published
Abstract [en]

Ore-based ironmaking generates a variety of residues, including slags and fines such as dust and sludges. Recycling of these residues within the integrated steel plant or in other applications is essential from a raw-material efficiency perspective. The main recycling route of off-gas dust is to the blast furnace (BF) via sinter, cold-bonded briquettes and tuyere injection. However, solely relying on the BF for recycling implicates that certain residues cannot be recycled in order to avoid build-up of unwanted elements, such as zinc. By introducing a holistic view on recycling where recycling via other process routes, such as the desulfurization (deS) station and the basic oxygen furnace (BOF), landfilling can be avoided. In the present study, process integration analyses were utilized to determine the most efficient recycling routes for off-gas dust that are currently not recycled within the integrated steel plants of Sweden. The feasibility of recycling was studied in experiments conducted in laboratory, pilot, and full-scale trials in the BF, deS station, and BOF. The process integration analyses suggested that recycling to the BF should be maximized before considering the deS station and BOF. The experiments indicated that the amount of residue that are not recycled could be minimized.

Place, publisher, year, edition, pages
Basel: MDPI, 2018
Keywords
Recycling, Cold-bonded briquettes, Blast furnace, Desulfurization, Basic oxygen furnace, Dust, Sludge, Fines
National Category
Metallurgy and Metallic Materials
Research subject
Process Metallurgy
Identifiers
urn:nbn:se:ltu:diva-71130 (URN)10.3390/met8100760 (DOI)000448658700024 ()2-s2.0-85054764975 (Scopus ID)
Funder
Swedish Energy Agency
Note

Validerad;2018;Nivå 2;2018-10-19 (marisr)

Available from: 2018-10-08 Created: 2018-10-08 Last updated: 2018-11-23Bibliographically approved
Andersson, A., Andersson, M., Mousa, E., Kullerstedt, A., Ahmed, H., Björkman, B. & Sundqvist Ökvist, L. (2018). The Potential of Recycling the High-Zinc Fraction of Upgraded BF Sludge to the Desulfurization Plant and Basic Oxygen Furnace. Paper presented at 8th International Congress on Science and Technology in Ironmaking — 8th ICSTI 2018, September 25 to 27 2018, Vienna.. Metals, 8(12), Article ID 1057.
Open this publication in new window or tab >>The Potential of Recycling the High-Zinc Fraction of Upgraded BF Sludge to the Desulfurization Plant and Basic Oxygen Furnace
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2018 (English)In: Metals, ISSN 2075-4701, Vol. 8, no 12, article id 1057Article in journal (Refereed) Published
Abstract [en]

In ore-based steelmaking, blast furnace (BF) dust is generally recycled to the BF via the sinter or cold-bonded briquettes and injection. In order to recycle the BF sludge to the BF, the sludge has to be upgraded, removing zinc. The literature reports cases of recycling the low-zinc fraction of upgraded BF sludge to the BF. However, research towards recycling of the high-zinc fraction of BF sludge within the ore-based steel plant is limited. In the present paper, the high-zinc fraction of tornado-treated BF sludge was incorporated in self-reducing cold-bonded briquettes and pellets. Each type of agglomerate was individually subjected to technical-scale smelting reduction experiments aiming to study the feasibility of recycling in-plant residues to the hot metal (HM) desulfurization (deS) plant. The endothermic reactions within the briquettes decreased the heating and reduction rate leaving the briquettes unreduced and unmelted. The pellets were completely reduced within eight minutes of contact with HM but still showed melt-in problems. Cold-bonded briquettes, without BF sludge, were charged in industrial-scale trials to study the recycling potential to the HM deS plant and basic oxygen furnace (BOF). The trials illustrated a potential for the complete recycling of the high-zinc fraction of BF sludge. However, further studies were identified to be required to verify these results.

Place, publisher, year, edition, pages
MDPI, 2018
Keywords
recycling, blast furnace sludge, smelting reduction, desulfurization, basic oxygen furnace, cold-bonded briquettes, cold-bonded pellets, low-sulfur binders
National Category
Metallurgy and Metallic Materials
Research subject
Process Metallurgy
Identifiers
urn:nbn:se:ltu:diva-72426 (URN)10.3390/met8121057 (DOI)000455072100081 ()2-s2.0-85058575555 (Scopus ID)
Conference
8th International Congress on Science and Technology in Ironmaking — 8th ICSTI 2018, September 25 to 27 2018, Vienna.
Note

Konferensartikel i tidskrift

Available from: 2019-01-02 Created: 2019-01-02 Last updated: 2019-04-23Bibliographically approved
Ahmed, H., Andersson, A., El-Tawil, A., Lotfian, S., Mousa, E., Sundqvist Ökvist, L. & Björkman, B. (2017). Alternative Reducing Agents for Sustainable Blast Furnace Ironmaking. In: ESTAD 2017: . Paper presented at 3rd European Steel Technology and Application Days, Vienna, Austria, 26-29 June 2017.
Open this publication in new window or tab >>Alternative Reducing Agents for Sustainable Blast Furnace Ironmaking
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2017 (English)In: ESTAD 2017, 2017Conference paper, Published paper (Refereed)
Abstract [en]

Lowering of CO2 emission from the integrated steel industry as well as minimizing theneed for landfill are important challenges in the focus for the integrated steel industry. With thisaim collaborative research projects have been conducted and are on-going on the possible useof renewable reducing agents or such with high content of H2 as well as for enabling recyclingof 1in-plant fines so far not possible to use. Due to contents of undesired impurities the blastfurnace (BF) sludge has to be pre-treated in an appropriate way before carbon and iron oxidecan be valorized. In order to understand the impact of alternative reducing agents as injectedthrough the tuyeres or part of top charged agglomerates containing iron oxide, samples oftorrefied biomass, plastic and in-plant fines have been analyzed by means of thermogravimetricanalyzer coupled with a mass spectrometer (TGA-MS).The results proved that effective utilization of carbon bearing BF dust and sludge as analternate reducing agent could be realized and can be implemented into BF after adequateupgrading. Plastic materials and biomass based reductants decomposition is associated with therelease of volatiles. The main contents of these volatiles are CO, H2 and hydrocarbon which areall known for their reduction potential. Moreover, injection of such materials is expected toimprove process efficiency and sustain the gas permeability along the BF cohesive zone. Onthe other hand, top charging of these materials would improve the energy and materialefficiency in the BF due to their higher reactivity compared to conventional carbon.

Keywords
biomass, iron and steel making wastes, waste plastic materials, reducing agents, reduction metallurgy.
National Category
Metallurgy and Metallic Materials
Research subject
Process Metallurgy
Identifiers
urn:nbn:se:ltu:diva-70064 (URN)
Conference
3rd European Steel Technology and Application Days, Vienna, Austria, 26-29 June 2017
Available from: 2018-07-04 Created: 2018-07-04 Last updated: 2018-08-14Bibliographically approved
Andersson, A., Ahmed, H., Rosenkranz, J., Samuelsson, C. & Björkman, B. (2017). Characterization and Upgrading of a Low Zinc-Containing and Fine Blast Furnace Sludge: A Multi-Objective Analysis. ISIJ International, 57(2), 262-271
Open this publication in new window or tab >>Characterization and Upgrading of a Low Zinc-Containing and Fine Blast Furnace Sludge: A Multi-Objective Analysis
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2017 (English)In: ISIJ International, ISSN 0915-1559, E-ISSN 1347-5460, Vol. 57, no 2, p. 262-271Article in journal (Refereed) Published
Place, publisher, year, edition, pages
The Iron and Steel Institute of Japan, 2017
Keywords
blast furnace sludge; recycling; characterization; zinc; hydrocyclone; leaching
National Category
Metallurgy and Metallic Materials
Research subject
Process Metallurgy
Identifiers
urn:nbn:se:ltu:diva-59991 (URN)10.2355/isijinternational.ISIJINT-2016-512 (DOI)000396642300008 ()2-s2.0-85013916025 (Scopus ID)
Funder
Swedish Energy Agency
Note

Validerad; 2017; Nivå 2; 2017-03-10 (andbra)

Available from: 2016-10-27 Created: 2016-10-27 Last updated: 2018-11-20Bibliographically approved
Andersson, A., Ahmed, H., Samuelsson, C. & Björkman, B. (2017). Characterization of Blast Furnace Sludge and Upgrading Using Physical Separation and Leaching. In: : . Paper presented at Konferens i Mineralteknik 2017, Luleå 7-8 februari 2017.
Open this publication in new window or tab >>Characterization of Blast Furnace Sludge and Upgrading Using Physical Separation and Leaching
2017 (English)Conference paper, Published paper (Refereed)
Abstract [en]

The on-site sinter plants of the Swedish ore based steel industry are all closed. Instead of using sinter, the blast furnaces (BF) operate on iron ore pellets and the major part of the recycling of in-plant residues is realized via cold bonded briquettes charged to the BF. Cost of raw materials and energy continuously drives the work towards an increased recycling of in plant residues. The major part of the zinc entering the BF leaves through the top gas ending up in the BF dust and sludge. The recycling of all the BF dust back to the BF leaves the BF sludge as the main bleed of zinc out of the system. In order to utilize the iron and carbon content of the sludge, means to remove zinc is required prior to recycling via the briquette. In the present work, blast furnace sludge has been characterized. Using the characterization as standpoint, different operations for zinc removal was suggested and studied in laboratory scale. Zinc was successfully removed using a hydrometallurgical and physical separation route, respectively. A successful dezincing operation would enable the recycling of the sludge. This would improve the material- and energy efficiency and substantially decrease the amount of sludge being landfilled.

National Category
Metallurgy and Metallic Materials
Research subject
Process Metallurgy
Identifiers
urn:nbn:se:ltu:diva-70062 (URN)
Conference
Konferens i Mineralteknik 2017, Luleå 7-8 februari 2017
Available from: 2018-07-04 Created: 2018-07-04 Last updated: 2018-08-14Bibliographically approved
Strandkvist, I., Engström, F. & Andersson, A. (2017). Influence of basicity on chromium leaching of low alloy EAF slag. In: : . Paper presented at 3rd ESTAD 2017 : European Steel Technology and Applications Days, Vienna, Austria, 26-29 June 2017.
Open this publication in new window or tab >>Influence of basicity on chromium leaching of low alloy EAF slag
2017 (English)Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

Due to excellent properties as a construction material slag is rising in popularity as a resource. However, some properties prevent usage, one of those is leaching of chromium. The leaching of slag is governed by the solubility of theminerals. By eliminating soluble minerals that contain chromium the chromiumleaching should decrease. In some low alloy EAF slag, brownmillerite, has beensuspected to leach chromium. By increasing the basicity of slag the formation of brownmillerite should be avoided. Low alloy EAF slag with basicity of 2.7 was altered by remelting the slag with SiO2 additions. The mineralogical composition was identified using SEM EDS and XRD. Slag samples were treated inan autoclave to simulate ageing. The autoclave treatment was successful as theremelted slag without modification leached with the same magnitude as the naturallyaged reference sample. At basicity 2.7, the investigated slag had the highest leaching of chromium, at average 2 mg/kg. The chromium leaching decreased to 0.2 mg/kg at basicity 2.4. The decrease of chromium leaching was connected to the decrease of brownmillerite. Lower basicity did not eliminate leaching ofchromium as merwinite, another mineral able to contain chromium, was formed instead of brownmillerite.

National Category
Metallurgy and Metallic Materials
Research subject
Process Metallurgy
Identifiers
urn:nbn:se:ltu:diva-64939 (URN)
Conference
3rd ESTAD 2017 : European Steel Technology and Applications Days, Vienna, Austria, 26-29 June 2017
Available from: 2017-08-03 Created: 2017-08-03 Last updated: 2017-11-28Bibliographically approved
Andersson, A., Morcel, A., Gullberg, A. & Ahmed, H. (2017). Upgrading and Recycling of Blast Furnace Sludge. In: : . Paper presented at 2nd ISIJ-VDEh-Jernkontoret Joint Symposium, Stockholm, June 12-13, 2017.
Open this publication in new window or tab >>Upgrading and Recycling of Blast Furnace Sludge
2017 (English)Conference paper, Poster (with or without abstract) (Other academic)
National Category
Metallurgy and Metallic Materials
Research subject
Process Metallurgy
Identifiers
urn:nbn:se:ltu:diva-70061 (URN)
Conference
2nd ISIJ-VDEh-Jernkontoret Joint Symposium, Stockholm, June 12-13, 2017
Available from: 2018-07-04 Created: 2018-07-04 Last updated: 2018-08-10Bibliographically approved
Andersson, A., Ahmed, H., Samuelsson, C. & Björkman, B. (2016). Feasible routes of blast furnace sludge upgrading in the light of its properties. In: SCANMET V: 5th International Conference on Process Development in Iron and Steelmaking, Luleå, 12-15 June 2016. Paper presented at 5th International Conference on Process Development in Iron and Steelmaking, Luleå, 12-15 June 2016.
Open this publication in new window or tab >>Feasible routes of blast furnace sludge upgrading in the light of its properties
2016 (English)In: SCANMET V: 5th International Conference on Process Development in Iron and Steelmaking, Luleå, 12-15 June 2016, 2016Conference paper, Published paper (Other academic)
National Category
Metallurgy and Metallic Materials
Research subject
Process Metallurgy
Identifiers
urn:nbn:se:ltu:diva-60762 (URN)
Conference
5th International Conference on Process Development in Iron and Steelmaking, Luleå, 12-15 June 2016
Funder
Swedish Energy Agency
Available from: 2016-11-29 Created: 2016-11-29 Last updated: 2018-01-19Bibliographically approved
Ahmed, H., Andersson, A., El-Tawil, A., Lotfian, S. & Björkman, B. (2015). Alternative Carbon Sources for Reduction. In: : . Paper presented at 2015 - Sustainable Industrial Processing Summit & Exhibition, Antalya, 4-9 October 2015.
Open this publication in new window or tab >>Alternative Carbon Sources for Reduction
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2015 (English)Conference paper, Published paper (Other academic)
National Category
Metallurgy and Metallic Materials
Research subject
Process Metallurgy
Identifiers
urn:nbn:se:ltu:diva-60770 (URN)
Conference
2015 - Sustainable Industrial Processing Summit & Exhibition, Antalya, 4-9 October 2015
Available from: 2016-11-29 Created: 2016-11-29 Last updated: 2018-01-11Bibliographically approved
Andersson, A., Ahmed, H., Samuelsson, C. & Björkman, B. (2015). Characterization and Upgrading of Ore Based Steelmaking Sludges. In: COM 2015: Conference of Metallurgists. Paper presented at Conference of Metallurgists, Montreal, August 23-26 2015.
Open this publication in new window or tab >>Characterization and Upgrading of Ore Based Steelmaking Sludges
2015 (English)In: COM 2015: Conference of Metallurgists, 2015Conference paper, Published paper (Other academic)
National Category
Metallurgy and Metallic Materials
Research subject
Process Metallurgy
Identifiers
urn:nbn:se:ltu:diva-60761 (URN)978-1-926872-32-2 (ISBN)
Conference
Conference of Metallurgists, Montreal, August 23-26 2015
Funder
Swedish Energy Agency
Available from: 2016-11-29 Created: 2016-11-29 Last updated: 2018-01-19Bibliographically approved
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