Structural Transformation of Molten CaO–SiO₂–Al₂O₃–Fe<i>_x</i>O Slags during Secondary Refining of Steels

• Wang Yu

  Key Laboratory for Ecological Metallurgy of Multimetallic Ores (Ministry of Education) School of Metallurgy, Northeastern University

• Zhang Rui

  Key Laboratory for Ecological Metallurgy of Multimetallic Ores (Ministry of Education) School of Metallurgy, Northeastern University

• Zhao Xuan

  Key Laboratory for Ecological Metallurgy of Multimetallic Ores (Ministry of Education) School of Metallurgy, Northeastern University

• Min Yi

  Key Laboratory for Ecological Metallurgy of Multimetallic Ores (Ministry of Education) School of Metallurgy, Northeastern University

• Liu Chengjun

  Key Laboratory for Ecological Metallurgy of Multimetallic Ores (Ministry of Education) School of Metallurgy, Northeastern University

抄録

According to the variation of compositions during steel secondary refining process, the ice-quenched samples of CaO–SiO₂–Fe_xO–Al₂O₃ system were prepared, the structure were detected via the method of Raman spectroscopy, and the evolution of structural units were further analyzed. The results showed that, for the Fe³⁺ cation, two types of units of tetrahedral fourfold coordination ([FeO₄]) and octahedral sixfold coordination ([FeO₆]) coexisted in the molten slag, and the ratio of [FeO₆]/[FeO₄] increases with the decreasing ratio of CaO/(SiO₂+Al₂O₃). For the Al³⁺ cations, four types of aluminum units of Q²_Al, Q³_Al, Q⁴_Al coexisted in the molten slag and the lower polymerized units Q²_Al transform into the higher polymerized Q³_Al and Q⁴_Al along with the ratio of Al/(Al+Si) increasing from 0.41 to 0.85. For the Si⁴⁺ cations, Q⁰_Si, Q¹_Si and Q²_Si are the main types of [SiO₄]-tetrahedral units, the Ca²⁺ cations of oxygen coordination in [SiO₄]-tetrahedral units are gradually replaced by Al³⁺, which just act as network modifier, with the increase of Al/(Si+Al) ratio. Accordingly, the degree of polymerization of molten slag presented in NBO/T increases with the process of secondary steelmaking.

収録刊行物

• ＩＳＩＪ　Ｉｎｔｅｒｎａｔｉｏｎａｌ

  ＩＳＩＪ　Ｉｎｔｅｒｎａｔｉｏｎａｌ 60 (2), 220-225, 2020-02-15

  一般社団法人 日本鉄鋼協会

キーワード

• secondary steelmaking
• refining slag
• melt structure
• Raman spectroscopy

詳細情報

• CRID: 1390002184875813632
• NII論文ID: 130007799320
• DOI: 10.2355/isijinternational.isijint-2019-418
• ISSN: 13475460
• ISSN: 09151559
• Web Site: https://www.jstage.jst.go.jp/article/isijinternational/60/2/60_ISIJINT-2019-418/_pdf
• 本文言語コード: en
• データソース種別:
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  • CiNii Articles
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