University of Oulu

Gornostayev, S.S., Heikkinen, E.‐P., Heino, J. and Fabritius, T. (2019), Occurrence and Behavior of Phosphorus‐Bearing Minerals in Metallurgical Coke. steel research int., 90: 1800580. doi:10.1002/srin.201800580

Occurrence and behavior of phosphorus-bearing minerals in metallurgical coke

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Author: Gornostayev, Stanislav S.1; Heikkinen, Eetu‐Pekka1; Heino, Jyrki1;
Organizations: 1Process Metallurgy Research Unit, University of Oulu, BOX 4300, Oulu, 90014, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 0.8 MB)
Persistent link: http://urn.fi/urn:nbn:fi-fe202001152195
Language: English
Published: John Wiley & Sons, 2019
Publish Date: 2020-06-03
Description:
The behavior of phosphorus‐bearing minerals is characterized from coking coals to the feed coke and the blast furnace (BF) coke using scanning electron microscope and thermodynamic calculations. In coals, they are represented mostly by apatite (major phase, used for thermodynamic calculations), crandallite, gorceixite, goyazite, monazite and xenotime. Apatite fully transforms to Ca₄P₂O₉ and Ca₃P₂O₈ at coking temperatures. In the samples of BF coke, phosphorus‐bearing phases are 5–30 μm in size. In the case of a closed system (inside pieces of coke, no gas), phosphorus is presented in the BF in the form of Ca₄P₂O₉ and Ca₃P₂O₈ up to 1250 °C. Above this temperature, it is transformed to Fe₃P (stable until 1495 °C). A further rise in temperature leads to the transformation of Fe₃P to Fe₂P (stable up to 1930 °C − tuyere level of the BF). In the case of an open system with intensive flow of BF gas, the formation of Fe₃P from Ca₄P₂O₉ and Ca₃P₂O₈ starts at 1178 °C. The Fe₂P appears near 1494–1495 °C, and after that it goes to a molten state.
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Series: Steel research international
ISSN: 1611-3683
ISSN-E: 1869-344X
ISSN-L: 1611-3683
Volume: 90
Issue: 6
Article number: 1800580
DOI: 10.1002/srin.201800580
OADOI: https://oadoi.org/10.1002/srin.201800580
Type of Publication: A1 Journal article – refereed
Field of Science: 222 Other engineering and technologies
Subjects:
Funding: This research was funded by the Academy of Finland.
Copyright information: © 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. This is the peer reviewed version of the following article: Gornostayev, S.S., Heikkinen, E.‐P., Heino, J. and Fabritius, T. (2019), Occurrence and Behavior of Phosphorus‐Bearing Minerals in Metallurgical Coke. steel research int., 90: 1800580, which has been published in final form at https://doi.org/10.1002/srin.201800580. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.