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Phosphorous Partition in Dephosphorization Slag Occurring with Crystallization at Initial Stage of Solidification

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ISIJ International, Vol. 48 (2008), No. 9, pp. 1165-1174.pdf4.74 MBPDFView/Open
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Title: Phosphorous Partition in Dephosphorization Slag Occurring with Crystallization at Initial Stage of Solidification
Authors: Son, Pham Khanh Browse this author
Kashiwaya, Yoshiaki Browse this author →KAKEN DB
Keywords: phosphorous partition
hot thermocouple
Issue Date: 15-Sep-2008
Publisher: Iron and Steel Institute of Japan
Journal Title: ISIJ International
Volume: 48
Issue: 9
Start Page: 1165
End Page: 1174
Publisher DOI: 10.2355/isijinternational.48.1165
Abstract: Basicity and the amount of FetO were investigated for their effects on the crystallization behavior of the simulated dephosphorizing slags. Twelve kinds of slags were prepared (C/S=1.0–2.5, FetO=10–20%, P2O5=5%). In the present experiment, the Hot Thermocouple Technique was used to melt and quench the samples. After quenching, the microstructure of the slag and the distributions of elements were examined by SEM and EDS analysis. The diameter of the crystal which precipitated in the sample increased with increasing basicity (C/S) and decreasing FetO content. In addition, glassy regions were observed in the two samples whose FetO content was 20% and whose basicity was 1.0 or 1.5. The samples (10% FetO, 5% P2O5), whose basicity was 1.0 (sample-1) precipitated as a monocalcium silicate (CaO·SiO2); the sample (10% FetO, 5% P2O5) whose basicity was 1.5 (sample-4) precipitated as a dicalcium silicate (2CaO·SiO2). In higher FetO (15–20%) slags, the crystals of the solid solution between 3CaO·P2O5 and 2CaO·SiO2 ((C3P–C2S)ss) were observed. When the amount of CaO increased from C/S=1.5 to C/S=2.5, 2CaO·SiO2 appeared with phosphorous content, but phosphorous was not found in CaO·SiO2.
Rights: 著作権は日本鉄鋼協会にある
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 柏谷 悦章

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