Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Study on the Equilibrium of Slag and Hot Metal at Tapping with Respect to Sulfur
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Micro-Modelling. KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy. KTH, School of Industrial Engineering and Management (ITM), Production Engineering.ORCID iD: 0000-0002-3548-8638
2017 (English)In: Steel Research International, Vol. 88, no 6, p. 1-9Article in journal (Refereed) Published
Abstract [en]

The blast furnace slag and hot metal were collected from the industrial trials. The collected slag and hot metal samples are re-melted in a graphite crucible and stirred to investigate the sulfur partition at different stirring times. The experimental oxygen potential is well controlled to simulate the blast furnace conditions. The results show evidently that sulfur is transferred from hot metal to slag, which led to an increase in the sulfur partition from its initial value (t=0 min) of 26 -33 at 1743 K, and from 23 to 37 at 1773 K after 30 min of slag-metal reaction. The results strongly indicate non-equilibrium between slag and hot metal at tapping. The sulfide capacities of the slag with typical composition of the slag at tapping are determined. On the basis of the sulfide capacity data, the theoretical sulfur partition is evaluated. The theoretically calculated partition further supports the finding obtained in the stirring experiments. This finding would suggest the possibility of improvement to increase the usage of blast furnace slag in desulfurization.  

Place, publisher, year, edition, pages
2017. Vol. 88, no 6, p. 1-9
Keywords [en]
Sulfur Partition, Sulfide Capacities, Desulfurization, Hot metal, Sulfur
National Category
Metallurgy and Metallic Materials
Research subject
Materials Science and Engineering
Identifiers
URN: urn:nbn:se:kth:diva-228346DOI: 10.1002/srin.201600336OAI: oai:DiVA.org:kth-228346DiVA, id: diva2:1209231
Note

QC 20180525

Available from: 2018-05-22 Created: 2018-05-22 Last updated: 2018-05-25Bibliographically approved
In thesis
1. Study of Sulfide Capacity of Slag and Sulfur Removal from Hot Metal
Open this publication in new window or tab >>Study of Sulfide Capacity of Slag and Sulfur Removal from Hot Metal
2018 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The present study aims at investigating the desulfurization process in hot metal and sulfide capacity of slags. The missing experimental data of sulfide capacities in Al2O3-CaOMgO-SiO2 system at 1713 K, 1743 K, 1773 K, 1823 K, 1873 K and in the Al2O3-CaO-SiO2 system at 1873 K were investigated under wellcontrolled oxygen potentials. These data along with the reliable and accurate data carefully selected from the literature were employed for KTH model optimization. The model was successfully optimized and produced good predictions of sulfide capacity between 1700 K and 1873 K for all liquid slags in the Al2O3-CaO-MgO-SiO2 system, especially for ladle slags and blast furnace slags, with an average relative deviation of approximately 15%. The partition of sulfur in the blast furnace at tapping was investigated. The results of re-melted slag and hot metal at temperatures of 1743 K and 1773 K showed that the two phases were not in equilibrium with respect to sulfur at tapping. Furthermore, about 30 min was required to reach equilibrium. The optimum equilibrium sulfur partition in the range of blast furnace slag was determined using sulfide capacity data calculated with the newly-optimized model. The results showed clearly that the best area which provides a good equilibrium sulfur partition is between 10 to 14 mass% MgO. The effect of aged CaC2 on the desulfurization of hot metal was investigated at 1673 K and 1773 K. The results show that the use of aged CaC2 does not have significant effect on the desulfurization process since all the samples used exhibited almost the same performance, despite being subject to different aging treatments. The possibility of re-sulfurization during the long waiting time in the transfer ladle before the BOF was investigated. From the results, II different solid phases were found present in the slag along with small portion of liquid slag. In addition, majority of sulfur in the slag is in the solid phase in the form of CaS, which is only a small fraction of the slag. The liquid slag and solid CaS was found to have a limited contact with the hot metal leading to very poor kinetics for re-sulfurization. Therefore, the amount re-sulfurization that is observed in the transfer ladle was found to be very low.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2018. p. 52
Series
TRITA-ITM-AVL ; 2018:29
National Category
Metallurgy and Metallic Materials
Research subject
Metallurgical process science
Identifiers
urn:nbn:se:kth:diva-228348 (URN)978-91-7729-812-0 (ISBN)
Public defence
2018-06-14, F3, Lindstedtsvagen 26, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

QC 20180522

Available from: 2018-05-22 Created: 2018-05-22 Last updated: 2018-05-22Bibliographically approved

Open Access in DiVA

No full text in DiVA

Other links

Publisher's full text

Authority records BETA

Condo, Adolfo Firmino TimoteoSichen, Du

Search in DiVA

By author/editor
Condo, Adolfo Firmino TimoteoSichen, Du
By organisation
Materials Science and EngineeringMicro-ModellingApplied Process MetallurgyProduction Engineering
Metallurgy and Metallic Materials

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 18 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf