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Crystallization Behaviors Concerned with TTT and CCT Diagrams of Blast Furnace Slag Using Hot Thermocouple Technique

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Title: Crystallization Behaviors Concerned with TTT and CCT Diagrams of Blast Furnace Slag Using Hot Thermocouple Technique
Authors: Kashiwaya, Yoshiaki Browse this author →KAKEN DB
Nakauchi, Toshiki Browse this author
Pham, Khanh Son Browse this author
Akiyama, Seitarou Browse this author
Ishii, Kuniyoshi Browse this author
Keywords: slag crystallization
blast furnace slag
TTT diagram
CCT diagram
hot thermocouple
Issue Date: Jan-2007
Publisher: Iron and Steel Institute of Japan
Journal Title: ISIJ International
Volume: 47
Issue: 1
Start Page: 44
End Page: 52
Publisher DOI: 10.2355/isijinternational.47.44
Abstract: Currently, the most of slags are recycled and reused by taking the advantages of the feature of respective slags (e.g. the BF slag is used for cement and roadbed material, LD slag is also used for the roadbed material and marine resources, etc.). The quality and quantity of recycle of slags changed greatly within recent ten years and it will be expected as an important resource in the future. Whereas there is a remained possibility on the recycle of slags, most of slags have a high temperature more than 1 500, when it was exhausted. In general, there are two cooling processes adopted into the slag treatment, one is an air-cooling process and the other is a water quenching process. However, those slag cooling processes does not utilize the sensible and the latent heat related to high temperature melt. If there were a TTT (Time-Temperature-Transformation: isothermal transformation) diagram and a CCT (Continuous-Cooling-Transformation: continuous cooling curve) diagram, the property of the final slag could be estimated by the designed cooling path. Furthermore, it could be possible or easier to recover the sensible and the latent heat through a given cooling path. In the present study, using SHTT (Single Hot Thermocouple Technique), TTT and CCT diagrams of BF slags were measured. Crystallization behavior in the TTT and CCT diagrams of BF slag were clarified by XRD analysis, SEM observation and EDS analysis together with the in situ observation. Crystal phases in the TTT diagram for BF slag used were Gehlenite (2CaO·Al2O3·SiO2) and Merwinite (3CaO·MgO;·2SiO2). The Merwinite precipitated faster than the Gehlenite. The nose position of Merwinite was 4 s at 1 090 and the nose of Gehlenite was 8 s at 1 230. CCT diagram had wider glass region than TTT diagram and the temperature of crystal region decreased to 1 340 at 1 000 s and 1 160 at 14 s.
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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