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Publications (10 of 154) Show all publications
Martinsson, J. & Sichen, D. (2019). Decarburization of Pig Iron in Synthetic BOF Converter Slag. ISIJ International, 59(1), 46-50
Open this publication in new window or tab >>Decarburization of Pig Iron in Synthetic BOF Converter Slag
2019 (English)In: ISIJ International, ISSN 0915-1559, E-ISSN 1347-5460, Vol. 59, no 1, p. 46-50Article in journal (Refereed) Published
Abstract [en]

The paper presents a study on the decarburization of pig iron droplets in synthetic BOF slag. The effects of droplet size and slag composition were studied. The results show evidently that the decarburization is very fast in general. One gram of pig iron is mostly decarburized within one minute. The reaction is shown to be faster when many small droplets were employed instead of one big droplet with equal total mass. This is explained by the bigger interfacial area between the liquid slag and the pig iron of the many small particles. It is also interesting to see that the decarburizing reaction in the slag having lower dynamic viscosity and higher FeO activity is slower than in the slag with higher viscosity and lower FeO activity. The slower reaction could be explained by the longer incubation time in this slag.

Place, publisher, year, edition, pages
IRON STEEL INST JAPAN KEIDANREN KAIKAN, 2019
Keywords
steelmaking, BOF, slag, pig iron, decarburization
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-244135 (URN)10.2355/isijinternational.ISIJINT-2018-472 (DOI)000457069600007 ()2-s2.0-85060737096 (Scopus ID)
Note

QC 20190218

Available from: 2019-02-18 Created: 2019-02-18 Last updated: 2019-02-18Bibliographically approved
Tomé Torquemada, S., Vickerfält, A. & Sichen, D. (2019). Experimental study on the activities of Sr, Al and Zr in liquid silicon. Metallurgical and materials transactions. B, process metallurgy and materials processing science
Open this publication in new window or tab >>Experimental study on the activities of Sr, Al and Zr in liquid silicon
2019 (English)In: Metallurgical and materials transactions. B, process metallurgy and materials processing science, ISSN 1073-5615, E-ISSN 1543-1916Article in journal (Other academic) Submitted
Abstract [en]

Experiments were carried out to determine the activities of Sr, Al and Zr in liquid silicon at temperatures between 1723K and 1873K (1450°C and 1600°C). Different oxide pellets, made of a SrSiO3-Sr2SiO4 mixture, an Al2O3-Al6Si2O13 mixture and a ZrSiO4-SiO2 mixture (for the Sr-Si system, Al-Si system and Zr-Si system respectively), were equilibrated with liquid silicon in a closed system. The activities of the metals in the silicon were calculated based on the contents of the element dissolved in the silicon. The temperature had negligible effect on the activity coefficients for the Sr and Al in the liquid silicon at the temperature range studied, while the activity coefficient of Zr in liquid silicon increased with temperature.

Keywords
Strontium, Aluminum, Zirconium, Silicon, Activity, Thermodynamics
National Category
Metallurgy and Metallic Materials
Research subject
Materials Science and Engineering
Identifiers
urn:nbn:se:kth:diva-247893 (URN)
Note

QC 20190404

Available from: 2019-03-26 Created: 2019-03-26 Last updated: 2019-04-04Bibliographically approved
Tomé Torquemada, S. & Sichen, D. (2019). Experimental study on the activity of calcium in liquid silicon. Metallurgical and materials transactions. B, process metallurgy and materials processing science
Open this publication in new window or tab >>Experimental study on the activity of calcium in liquid silicon
2019 (English)In: Metallurgical and materials transactions. B, process metallurgy and materials processing science, ISSN 1073-5615, E-ISSN 1543-1916Article in journal (Other academic) Submitted
National Category
Metallurgy and Metallic Materials
Research subject
Materials Science and Engineering
Identifiers
urn:nbn:se:kth:diva-247894 (URN)
Note

QC 20190403

Available from: 2019-03-26 Created: 2019-03-26 Last updated: 2019-04-03Bibliographically approved
Kang, Y., Scheller, P. R., Sichen, D. & Morita, K. (2019). In Situ Observation on the Interactions of Nonmetallic Inclusions on the Surface of Liquid Steel. In: Advanced Real Time Imaging II: Cutting-Edge Techniques in Materials Science Studies (pp. 13-18). Springer International Publishing
Open this publication in new window or tab >>In Situ Observation on the Interactions of Nonmetallic Inclusions on the Surface of Liquid Steel
2019 (English)In: Advanced Real Time Imaging II: Cutting-Edge Techniques in Materials Science Studies, Springer International Publishing , 2019, p. 13-18Chapter in book (Refereed)
Abstract [en]

The behaviors of several types of inclusions on the surface of liquid steel were examined using a confocal laser scanning microscope, CLSM. While alumina inclusions are likely to attract each other, agglomerate, and grow fast by the agglomeration, the other types of inclusions such as spinel and calcium aluminate rarely interact with each other. The analysis on the observation result of the CLSM indicates that the attraction force and the agglomeration play a significant role in the growth of alumina inclusions. Moreover, the behaviors of liquid calcium aluminate inclusions, which were intentionally injected, could be carefully observed. Their agglomeration took place only when they occasionally collide under the existence of external force, in spite of relatively low collision probability.

Place, publisher, year, edition, pages
Springer International Publishing, 2019
Keywords
Agglomeration, Alumina, Confocal scanning laser microscope, Nonmetallic inclusion, Spinel, Aluminum oxide, Liquids, Sodium Aluminate, Alumina inclusions, Calcium aluminate, Collision probability, Confocal laser scanning microscope, In-situ observations, Non-metallic inclusions, Calcium compounds
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-252236 (URN)10.1007/978-3-030-06143-2_2 (DOI)2-s2.0-85064065674 (Scopus ID)
Note

QC 20190614

Available from: 2019-06-14 Created: 2019-06-14 Last updated: 2019-10-16Bibliographically approved
Martinsson, J., Glaser, B. & Sichen, D. (2019). The structure of foaming BOF-converter slag. Ironmaking & steelmaking, 46(8), 777-781
Open this publication in new window or tab >>The structure of foaming BOF-converter slag
2019 (English)In: Ironmaking & steelmaking, ISSN 0301-9233, E-ISSN 1743-2812, Vol. 46, no 8, p. 777-781Article in journal (Refereed) Published
Abstract [en]

The structure of foaming synthetic BOF-converter slags was studied by freezing the foam and using ocular examination. The foams were generated by CO gas formed due to the reaction between FeO in the slag and carbon in the hot metal. The character of the foams varied a lot with slag composition. Slag with lower viscosity resulted in foams with small gas bubbles, while slag having high viscosity resulted in very big bubbles.

Place, publisher, year, edition, pages
TAYLOR & FRANCIS LTD, 2019
Keywords
BOF, foaming slag, emulsion, slag structure
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-263367 (URN)10.1080/03019233.2017.1410950 (DOI)000490481500011 ()2-s2.0-85073878765 (Scopus ID)
Note

QC 20191118

Available from: 2019-11-18 Created: 2019-11-18 Last updated: 2019-11-18Bibliographically approved
Wang, H., White, J. F. & Sichen, D. (2018). A New Experimental Design to Study the Kinetics of Solid Dissolution into Liquids at Elevated Temperature. Metallurgical and materials transactions. B, process metallurgy and materials processing science, 49(2), 688-698
Open this publication in new window or tab >>A New Experimental Design to Study the Kinetics of Solid Dissolution into Liquids at Elevated Temperature
2018 (English)In: Metallurgical and materials transactions. B, process metallurgy and materials processing science, ISSN 1073-5615, E-ISSN 1543-1916, Vol. 49, no 2, p. 688-698Article in journal (Refereed) Published
Abstract [en]

A new method was developed to study the dissolution of a solid cylinder in a liquid under forced convection at elevated temperature. In the new design, a rotating cylinder was placed concentrically in a crucible fabricated by boring four holes into a blank material for creating an internal volume with a quatrefoil profile. A strong flow in the radial direction in the liquid was created, which was evidently shown by computational fluid dynamic (CFD) calculations and experiments at both room temperature and elevated temperature. The new setup was able to freeze the sample as it was at experimental temperature, particularly the interface between the solid and the liquid. This freezing was necessary to obtain reliable information for understanding the reaction mechanism. This was exemplified by the study of dissolution of a refractory in liquid slag. The absence of flow in the radial direction in the traditional setup using a symmetrical cylinder was also discussed. The differences in the findings by past investigators using the symmetrical cylinder are most likely due to the extent of misalignment of the cylinder in the containment vessel.

Place, publisher, year, edition, pages
Springer, 2018
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-225051 (URN)10.1007/s11663-018-1196-9 (DOI)000426808500021 ()2-s2.0-85046935166 (Scopus ID)
Note

QC 20180328

Available from: 2018-03-28 Created: 2018-03-28 Last updated: 2018-10-16Bibliographically approved
Martinsson, J., Deng, Z. & Sichen, D. (2018). A Semi-Empirical Model of Particle Velocity in Foam. ISIJ International, 58(7), 1368-1370
Open this publication in new window or tab >>A Semi-Empirical Model of Particle Velocity in Foam
2018 (English)In: ISIJ International, ISSN 0915-1559, E-ISSN 1347-5460, Vol. 58, no 7, p. 1368-1370Article in journal (Refereed) Published
Abstract [en]

A semi-empirical model was developed to predict the apparent velocity of particles falling through foams. Different foams were generated from liquids with different viscosities and surface tensions. Particles with different sizes and densities were dropped into the foam and average velocities were calculated. Based on the experimental work, the semi-empirical model was derived from an energy balance between buoyancy, drag and the energy needed for the particles to deform the bubbles in their path.

Place, publisher, year, edition, pages
Iron and Steel Institute of Japan, 2018
Keywords
steelmaking, BOF, emulsion, particle velocity, semi-empirical model
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-233303 (URN)10.2355/isijinternational.ISIJINT-2018-245 (DOI)000440393200024 ()2-s2.0-85050088374 (Scopus ID)
Note

QC 20180816

Available from: 2018-08-16 Created: 2018-08-16 Last updated: 2018-08-16Bibliographically approved
Wang, H., Caballero, R. & Sichen, D. (2018). Dissolution of MgO based refractories in CaO-Al2O3-MgO-SiO2 slag. Journal of the European Ceramic Society, 38(2), 789-797
Open this publication in new window or tab >>Dissolution of MgO based refractories in CaO-Al2O3-MgO-SiO2 slag
2018 (English)In: Journal of the European Ceramic Society, ISSN 0955-2219, E-ISSN 1873-619X, Vol. 38, no 2, p. 789-797Article in journal (Refereed) Published
Abstract [en]

Dissolution of different types of MgO based refractories into molten CaO-Al2O3-MgO-SiO2 slag was studied. Formation of micro spinel particles by addition of either colloidal alumina or micro alumina powder in the MgO matrix efficiently reduced the dissolution. The dissolution of MgO was found to be controlled by the slag penetration into the MgO matrix. In the case of stagnant slag, the slag-penetration would lead to the final dissociation of the decarbonized commercial MgO-carbon cube in less than 6 min. The major dissolution took place between the MgO grains and the liquid in this penetrated layer. The increase of the thickness slowed down the dissolution. In the case of stagnant slag and slag stirred at low speed, the internal mass transfer in the slag penetrated layer is the controlling step. At higher stirring speeds, the slag-penetrated layer was removed. The removal of the penetrated layer would enhance the dissolution process.

Place, publisher, year, edition, pages
ELSEVIER SCI LTD, 2018
Keywords
MgO based refractory, Slag-refractory reaction, Dissolution, Dissolution mechanism
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-220806 (URN)10.1016/j.jeurceramsoc.2017.09.030 (DOI)000418211000048 ()2-s2.0-85029808952 (Scopus ID)
Note

QC 20180116

Available from: 2018-01-16 Created: 2018-01-16 Last updated: 2018-03-13Bibliographically approved
Tome-Torquemada, S., Glaser, B. & Sichen, D. (2018). Experimental study of the phase relationships in the SiO2-SrO-Al2O3 system. Calphad, 62, 238-243
Open this publication in new window or tab >>Experimental study of the phase relationships in the SiO2-SrO-Al2O3 system
2018 (English)In: Calphad, ISSN 0364-5916, E-ISSN 1873-2984, Vol. 62, p. 238-243Article in journal (Refereed) Published
Abstract [en]

The phase relationships in silica rich area in the SiO2-SrO-Al2O3 system were determined experimentally at 1723 K (1450 degrees C), 1823 K (1550 degrees C) and 1873 K (1600 degrees C) using quenching technique. Phases of the quenched samples were examined and identified using light optical microscopy (LOM), scanning electron microscope (SEM) and energy dispersive x-ray spectroscopy (EDS). X-ray Diffraction (XRD) was used to confirm the presence of solid phases. Based on the experimental results, the liquidus projections in the silica rich area for the studied temperatures were constructed.

Place, publisher, year, edition, pages
PERGAMON-ELSEVIER SCIENCE LTD, 2018
Keywords
SiO2-SrO-Al2O3, Phase diagram, Quenching method, Experimental
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-235605 (URN)10.1016/j.calphad.2018.08.002 (DOI)000444666200025 ()2-s2.0-85051386453 (Scopus ID)
Note

QC 20181001

Available from: 2018-10-01 Created: 2018-10-01 Last updated: 2019-03-29Bibliographically approved
Tomé Torquemada, S., Glaser, B. & Sichen, D. (2018). Experimental study of the phase relationships in the SrO-SiO2 system. Journal of the European Ceramic Society, 38(9), 3354-3360
Open this publication in new window or tab >>Experimental study of the phase relationships in the SrO-SiO2 system
2018 (English)In: Journal of the European Ceramic Society, ISSN 0955-2219, E-ISSN 1873-619X, Vol. 38, no 9, p. 3354-3360Article in journal (Refereed) Published
Abstract [en]

The phase relationships in the SiO2-SrO system were determined experimentally using the quenching technique in the temperature range between 1573 K (1300 °C) and 1898 K (1625 °C). The phases in the quenched samples were examined and identified using light optical microscopy (LOM), scanning electron microscope (SEM) and energy dispersive x-ray spectroscopy (EDS). The presence of solid phases and their nature were further confirmed using X-ray Diffraction (XRD). Based on the experimental results, the phase diagram was constructed. The phase diagram shows a congruent melting of the SrSiO3 at 1840 K (1567 °C). The eutectic between the SrSiO3, SiO2 and liquid happens at 1608 K (1335 °C) and 67 mol% SiO2 and the eutectic between the SrSiO3.

Place, publisher, year, edition, pages
Elsevier, 2018
Keywords
Experimental, Phase diagram, Quenching method, SrO-SiO2
National Category
Materials Engineering
Identifiers
urn:nbn:se:kth:diva-227517 (URN)10.1016/j.jeurceramsoc.2018.03.030 (DOI)000433014200036 ()2-s2.0-85044335089 (Scopus ID)
Note

QC 20180521

Available from: 2018-05-21 Created: 2018-05-21 Last updated: 2019-03-29Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-3548-8638

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