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Seetharaman, SeshadriORCID iD iconorcid.org/0000-0003-4695-9308
Publications (10 of 141) Show all publications
Hazra, S., Pal, S., Biswajeet, D. D., Sahoo, M., Tarachand, G. S., Bhattacharyya, D., . . . Seetharaman, S. (2023). Optimization of high alumina slag practice in blast furnace ironmaking: an industrial approach (PART 1: fundamental aspects). Ironmaking & steelmaking, 50(8), 1124-1137
Open this publication in new window or tab >>Optimization of high alumina slag practice in blast furnace ironmaking: an industrial approach (PART 1: fundamental aspects)
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2023 (English)In: Ironmaking & steelmaking, ISSN 0301-9233, E-ISSN 1743-2812, Vol. 50, no 8, p. 1124-1137Article in journal (Refereed) Published
Abstract [en]

The productivity of the blast furnace Ironmaking process is significantly dependent on the slag chemistry. The presence of compounds like Al2O3 in high quantities can make the hearth slag highly viscous and difficult to tap. The objective of part-1 of this study is to provide a comprehensive analysis of the role of high alumina (Al2O3 > 15%) compositions in the blast furnace slags. Slag viscosity, liquidus temperature, activation energy, etc., are critically reviewed with respective solutions to operate under the desired conditions. Flow parameters of the slag are examined to understand the melting-softening phenomena which directly affect the slag tap-to-tap time. The addition of certain additives to the slag system has also been studied with the aim to improve the target properties of the slag. A range of slag compositions and their optimization techniques are discussed in this part to provide greater insight into the topic.

Place, publisher, year, edition, pages
Informa UK Limited, 2023
Keywords
additives, alumina anomaly, Blast furnace, flow characteristics, high alumina slag, ironmaking, liquidus temperature, viscosity
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-338448 (URN)10.1080/03019233.2023.2210901 (DOI)000990919000001 ()2-s2.0-85159648984 (Scopus ID)
Note

QC 20231115

Available from: 2023-11-15 Created: 2023-11-15 Last updated: 2023-11-15Bibliographically approved
Wang, X., Li, W. & Seetharaman, S. (2022). Kinetic studies of oxidation of MgAlON and a comparison of the oxidation behaviour of AlON, MgAlON, O'SiAlON-ZrO2, and BN-ZCM ceramics. International Journal of Materials Research - Zeitschrift für Metallkunde, 93(6), 545-553
Open this publication in new window or tab >>Kinetic studies of oxidation of MgAlON and a comparison of the oxidation behaviour of AlON, MgAlON, O'SiAlON-ZrO2, and BN-ZCM ceramics
2022 (English)In: International Journal of Materials Research - Zeitschrift für Metallkunde, ISSN 1862-5282, E-ISSN 2195-8556, Vol. 93, no 6, p. 545-553Article in journal (Refereed) Published
Abstract [en]

The kinetics and morphology of the oxidation process of magnesium-aluminium oxynitride (MgAlON), aluminium oxynitride (AlON), 0' SiAlON-ZrO2, and BN-ZCM have been studied in the temperature range 1373-1773 K. Oxidation experiments with powder and plate samples of the above materials have been carried out in air. MgAlON shows the best resistance to oxidation at lower temperatures (<1473 K), whereas at higher temperatures (similar to 773 K), AlON shows the best resistance. O'SiAlON-ZrO2 shows very good oxidation resistance up to 1673 K. But its oxidation rate increases strongly above 1673 K, presumably due to the formation of liquid phase. BN-ZCM has the poorest oxidation resistance due to the evaporation of B2O3. The activation energies for the chemical oxidation reaction of AlON, MgAlON, and O'SiAlON-ZrO2 are 214, 330 and 260 kJ/mol, respectively. The overall diffusion activation energies for AlON, MgAlON, O'SiAlON-ZrO2 and BN-ZCM are 227, 573, 367 and 289 kJ/mol, respectively.

Place, publisher, year, edition, pages
WALTER DE GRUYTER GMBH, 2022
Keywords
Oxidation, MgAlON, Kinetics, Morphology
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-307309 (URN)000738547000009 ()
Note

QC 20220121

Available from: 2022-01-21 Created: 2022-01-21 Last updated: 2022-06-25Bibliographically approved
Tilliander, U., Aune, R. E. & Seetharaman, S. (2022). Kinetics studies of hydrogen reduction of Cu2O. International Journal of Materials Research - Zeitschrift für Metallkunde, 97(1), 72-78
Open this publication in new window or tab >>Kinetics studies of hydrogen reduction of Cu2O
2022 (English)In: International Journal of Materials Research - Zeitschrift für Metallkunde, ISSN 1862-5282, E-ISSN 2195-8556, Vol. 97, no 1, p. 72-78Article in journal (Refereed) Published
Abstract [en]

In present work, reduction kinetics of Cu2O by hydrogen gas was studied by thermogravimetric analyses (TGA). The TGA experiments were carried out both isothermally and non-isothermally on shallow powder beds. It was established that additions of Ni or NiO did not have any serious effect on the kinetics of reduction of Cu2O. The composition and microstructures of the reaction products were analyzed after each experiment by X-ray diffraction (XRD) as well as by scanning electron microscopy (SEM). The activation energy for the reaction was evaluated from isothermal as well as non-isothermal reduction experiments and was found to be in good agreement. The impact of the stability of the oxide on the activation energy for hydrogen reduction is also discussed.

Place, publisher, year, edition, pages
WALTER DE GRUYTER GMBH, 2022
Keywords
Copper oxide, Hydrogen reduction, Kinetics, Activation energy
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-307540 (URN)10.3139/ijmr-2006-0011 (DOI)000740393800011 ()
Note

QC 20220131

Available from: 2022-01-31 Created: 2022-01-31 Last updated: 2022-06-25Bibliographically approved
Seetharaman, S., Wang, L. & Wang, H. (2022). Slags containing transition metal (chromium and vanadium) oxides—Conversion from ticking bombs to valuable resources: Collaborative studies between KTH and USTB. International Journal of Minerals, Metallurgy and Materials, 29(4), 750-757
Open this publication in new window or tab >>Slags containing transition metal (chromium and vanadium) oxides—Conversion from ticking bombs to valuable resources: Collaborative studies between KTH and USTB
2022 (English)In: International Journal of Minerals, Metallurgy and Materials, ISSN 1674-4799, E-ISSN 1869-103X, Vol. 29, no 4, p. 750-757Article in journal (Refereed) Published
Abstract [en]

As the steel industry expands worldwide, slag dumps with transition metals (especially chromium and vanadium) are becoming more common, posing a serious environmental threat. Understanding the properties of slags containing transition metal oxides, as well as how to use the slags to recover and recycle metal values, is critical. Toward this end, the University of Science and Technology Beijing (USTB) and Royal Institute of Technology (KTH) have been collaborating on slags containing transition metals for decades. The research was carried out from a fundamental viewpoint to get a better understanding of the structure of these slags and their properties, as well as industrial practices. The research focused on the three “R”s, viz. retention, recovery, and recycling. The present paper attempts to highlight some of the important achievements in these joint studies. 

Place, publisher, year, edition, pages
Springer Nature, 2022
Keywords
chromium, collaborative study, recovery, transition metals, vanadium, Chromium compounds, Industrial research, Metal recovery, Recycling, Steelmaking, Transition metal oxides, Chromium oxides, Environmental threats, Metal values, Property, Royal Institute of Technology, Science and Technology, Slag dumps, Transition-metal oxides, Vanadium oxides, Slags
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-322042 (URN)10.1007/s12613-022-2424-5 (DOI)000770183900001 ()2-s2.0-85126459517 (Scopus ID)
Note

QC 20230116

Correction in: International Journal of Minerals, Metallurgy and Materials, Volume 29, Issue 6, Pages 1304, June 2022. DOI:10.1007/s12613-022-2495-3, WOS: 000782346900001, Scopus: 2-s2.0-85128041953

Available from: 2022-11-29 Created: 2022-11-29 Last updated: 2023-01-16Bibliographically approved
Wang, X., Li, W. & Seetharaman, S. (2022). Synthesis and characterisation of MgAlON. International Journal of Materials Research - Zeitschrift für Metallkunde, 93(6), 540-544
Open this publication in new window or tab >>Synthesis and characterisation of MgAlON
2022 (English)In: International Journal of Materials Research - Zeitschrift für Metallkunde, ISSN 1862-5282, E-ISSN 2195-8556, Vol. 93, no 6, p. 540-544Article in journal (Refereed) Published
Abstract [en]

This paper deals with the synthesis of MgAlON ceramics. The thermodynamic properties of this system were evaluated and the phase stability diagram of MgAlON was established. The synthesis of this material was successfully carried out by a careful choice of the experimental parameters in accordance with the phase stability diagram. The procedure adopted was to subject the starting materials to sinter under 25 MPa. A microstructure evaluation of the synthesised material was carried out. The mechanical properties of MgAlON were determined. The synthesised material was also subjected to X-ray diffraction, transmission electron microscopy and high-resolution electron microscopy analyses. The crystallographic data of MgAlON were generated as a result of the present studies. A JCPSD file of MgAlON has been suggested.

Place, publisher, year, edition, pages
WALTER DE GRUYTER GMBH, 2022
Keywords
Synthesis, Characterisation, MgAlON
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-307308 (URN)10.3139/ijmr-2002-0091 (DOI)000738547000008 ()
Note

QC 20220121

Available from: 2022-01-21 Created: 2022-01-21 Last updated: 2022-06-25Bibliographically approved
Hayashi, M., Rajter, R., Morales, R. & Seetharaman, S. (2022). Thermal diffusivities of uniaxially cold-pressed Fe2Mo powders. International Journal of Materials Research - Zeitschrift für Metallkunde, 94(11), 1179-1184
Open this publication in new window or tab >>Thermal diffusivities of uniaxially cold-pressed Fe2Mo powders
2022 (English)In: International Journal of Materials Research - Zeitschrift für Metallkunde, ISSN 1862-5282, E-ISSN 2195-8556, Vol. 94, no 11, p. 1179-1184Article in journal (Refereed) Published
Abstract [en]

Fe2Mo powders have been produced from Fe2MoO4 powders by gas - solid reduction using pure H-2 gas at 1023 and 1173 K. The thermal diffusivity of the cold-pressed Fe2Mo powders having a relative density between 0.52 and 0.72 has been measured at room temperature both in air and in vacuum using the laser-flash method. A correlation was observed between the thermal diffusivity and the relative density for the powders reduced at different temperatures, regardless of the difference in microstructure of the powders. In order to explain the porosity dependence of the effective thermal conductivity, a new simple method developed based on the Ohm's law models was used. The model successfully simulates the experimental data, and the thermal conductivity of bulk Fe2Mo was estimated as 10.8 W/mK.

Place, publisher, year, edition, pages
Walter de Gruyter GmbH, 2022
Keywords
Thermal diffusivity, Porosity, Fe2Mo, Powder metallurgy
National Category
Manufacturing, Surface and Joining Technology Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-309052 (URN)10.1515/ijmr-2003-0215 (DOI)000751657300002 ()
Note

QC 20220221

Available from: 2022-02-21 Created: 2022-02-21 Last updated: 2022-11-28Bibliographically approved
Seetharaman, S., Battezzati, L., Mohr, M. & Fecht, H.-J. -. (2022). Thermophysical Properties of Steels. In: Metallurgy in Space: (pp. 377-401). Springer Nature
Open this publication in new window or tab >>Thermophysical Properties of Steels
2022 (English)In: Metallurgy in Space, Springer Nature , 2022, p. 377-401Chapter in book (Refereed)
Abstract [en]

Modelling of casting of steels needs very reliable thermophysical data. It has been known that impurities as, for example, oxygen or sulfur in steel have a serious impact on the thermophysical properties such as surface tension. Further, during the modelling of the casting process, it is important to have reliable data and delineate the effect of the gravitational forces. Thus, measurements of thermophysical properties of steels at high temperatures need be carried out under microgravity environment. The results obtained need to be compared with those generated by conventional methods under terrestrial conditions so that the effect of gravity is well understood as industrial processes are carried out under 1 g conditions. These unique measurements were carried out as a part of the ThermoLab/ThermoProp projects under the sponsorship of European Space Agency (ESA). The results obtained in the case of industrial steel samples are presented in this chapter. 

Place, publisher, year, edition, pages
Springer Nature, 2022
Series
The Minerals, Metals & Materials Series, ISSN 2367-1181
Keywords
Casting process, Condition, Conventional methods, G-Condition, Gravitational forces, Highest temperature, Industrial processs, Measurements of, Microgravity environments, Thermophysical data, Thermodynamic properties
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-322583 (URN)10.1007/978-3-030-89784-0_17 (DOI)2-s2.0-85127833640 (Scopus ID)
Note

Part of book: ISBN 978-3-030-89783-3

QC 20221222

Available from: 2022-12-22 Created: 2022-12-22 Last updated: 2022-12-22Bibliographically approved
Li, P., Li, X., Guo, H., Yan, B., Chen, D., Zhao, W. & Seetharaman, S. (2022). Understanding reactions between water and steelmaking slags: Iron distribution, hydrogen generation, and phase transformations. International journal of hydrogen energy, 47(48), 20741-20754
Open this publication in new window or tab >>Understanding reactions between water and steelmaking slags: Iron distribution, hydrogen generation, and phase transformations
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2022 (English)In: International journal of hydrogen energy, ISSN 0360-3199, E-ISSN 1879-3487, Vol. 47, no 48, p. 20741-20754Article in journal (Refereed) Published
Abstract [en]

Environmentally friendly energy harvesting can be achieved by the H2O thermochemical treatment of steelmaking slags. Hot slag from steel manufacturing is used as a sacrificial material to produce H2 in a stream of steam. In parallel, this process enhances the magnetic properties of the slag, benefitting the Fe recovery. In this work, the occurrence states of different iron species in slags, as well as their reactivity and phase transformations in H2O, were investigated. The results showed that Fe2+ was mainly distributed in olivine (Ca, Fe, Mg, Mn)2SiO4 when the basicity was low. As the basicity increased, a gradual enrichment of Fe2+ in RO phase (divalent oxides solid solution, R = Fe, Mg, Mn etc.) was observed. In addition to steelmaking slags, the H2O splitting reactions of synthetic model iron compounds, RO phase (Mg1-xFexO, x = 0.36, 0.63, 0.77) and kirschsteinite (CaFeSiO4) were also tested. RO phase exhibited fast kinetics, with its activity proportional to the FeO content. Oxidation of the magnesia-rich RO phase resulted in the phase segregation of iron-depleted magnesiowustite (Mg,Fe-depleted)O and iron-rich spinel (Mg, Fe-rich)3O4. The H2O splitting of CaFeSiO4 suffered from extremely low kinetics below 900 degrees C, which could be enhanced by raising the temperature. The H2 production capacity of steelmaking slags was strongly affected by the basicity, which improved when more Fe2+ existed as RO phase rather than CaFeSiO4. After oxidation in steam at 850 degrees C, the slag sample with a basicity of 1.83 produced 29.3 cm3.g(material)-1 hydrogen at 850 degrees C for 60 min, with a conversion ratio of 80.1%.

Place, publisher, year, edition, pages
Elsevier BV, 2022
Keywords
Steelmaking slag, Basicity, RO, Kirschsteinite, H-2 generation
National Category
Metallurgy and Metallic Materials Other Environmental Engineering
Identifiers
urn:nbn:se:kth:diva-315514 (URN)10.1016/j.ijhydene.2022.04.209 (DOI)000810166700006 ()2-s2.0-85130340553 (Scopus ID)
Note

QC 20220707

Available from: 2022-07-07 Created: 2022-07-07 Last updated: 2022-07-07Bibliographically approved
Korobeinikov, I., Endo, R., Seetharaman, S. & Volkova, O. (2021). Density of Liquid Manganese Measured Using the Maximum Bubble Pressure Method. Metallurgical and materials transactions. B, process metallurgy and materials processing science, 52(2), 571-575
Open this publication in new window or tab >>Density of Liquid Manganese Measured Using the Maximum Bubble Pressure Method
2021 (English)In: Metallurgical and materials transactions. B, process metallurgy and materials processing science, ISSN 1073-5615, E-ISSN 1543-1916, Vol. 52, no 2, p. 571-575Article in journal (Refereed) Published
Abstract [en]

Manganese is an important metal for steelmaking. Data on the density of the metal are scarce and show considerable scatter. Present work reports the density of the liquid manganese in the range of 1535 K to 1836 K estimated for the first time with the use of the maximum bubble pressure technique. The obtained density of the manganese is marginally higher than previously reported in the literature.

Place, publisher, year, edition, pages
Springer Nature, 2021
Keywords
Manganese, Maximum bubble pressure, Maximum bubble pressure methods, Density of liquids
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-304440 (URN)10.1007/s11663-020-02044-y (DOI)000606144800001 ()2-s2.0-85099211770 (Scopus ID)
Note

QC 20211108

Available from: 2021-11-08 Created: 2021-11-08 Last updated: 2022-06-25Bibliographically approved
Shyrokykh, T., Wei, X., Seetharaman, S. & Volkova, O. (2021). Vaporization of Vanadium Pentoxide from CaO-SiO2-VOx Slags During Alumina Dissolution. Metallurgical and materials transactions. B, process metallurgy and materials processing science, 52(3), 1472-1483
Open this publication in new window or tab >>Vaporization of Vanadium Pentoxide from CaO-SiO2-VOx Slags During Alumina Dissolution
2021 (English)In: Metallurgical and materials transactions. B, process metallurgy and materials processing science, ISSN 1073-5615, E-ISSN 1543-1916, Vol. 52, no 3, p. 1472-1483Article in journal (Refereed) Published
Abstract [en]

The vaporization of vanadium pentoxide from CaO-SiO2-VOx ternary slags using different gas treatment regimens and parallel vacuum gas extirpation to treat V-bearing slags at 1873 K has been developed in the present study. The novelty of the present study is to monitor the effect of parallel alumina dissolution on the vaporization phenomenon. Vanadium pentoxide has high vapor pressure at the temperatures over 1500 K. When CaO-SiO2-VOx ternary slags, kept in dense alumina crucibles, are injected with oxygen, V2O5 gas bubbles are formed which are forced out by using vacuum extirpation. The vanadium pentoxide could be then collected in the exhaust gases. The mechanism of the process phenomenon is described as the formation of V2O5 gas phase resulting from the oxidation of the lower-valent oxides present in the slag. This gas phase would form microbubbles in the molten slag bulk phase due to low surface tension between the gas phase and the slag, thereby increasing the contact surface. At the same time, the crucible material would dissolve in the slag causing an increase in the slag viscosity. Due to the high slag viscosity of the bulk slag, these microbubbles formed would have difficulty in coalescing and reaching the slag surface. The escaping of the bubbles into the gas phase is enabled by the vacuum extirpation. 

Place, publisher, year, edition, pages
Springer Nature, 2021
Keywords
Alumina, Aluminum oxide, Bubbles (in fluids), Calcium oxide, Dissolution, Exhaust gases, Flocculation, Silica, Silicon, Vanadium pentoxide, Vaporization, Viscosity, Alumina crucible, Alumina dissolution, Contact surface, Crucible materials, Gas treatment, Microbubbles, Molten Slag, Slag viscosity, Slags
National Category
Metallurgy and Metallic Materials
Identifiers
urn:nbn:se:kth:diva-308506 (URN)10.1007/s11663-021-02114-9 (DOI)000634657000002 ()2-s2.0-85103410849 (Scopus ID)
Note

QC 20220214

Available from: 2022-02-14 Created: 2022-02-14 Last updated: 2022-06-25Bibliographically approved
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ORCID iD: ORCID iD iconorcid.org/0000-0003-4695-9308

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