Activity of Chromium Oxide in CaO–SiO<sub>2</sub>–MgO–Al<sub>2</sub>O<sub>3</sub>–MnO–CaF<sub>2</sub>–CrO<i><sub>x</sub></i> Slag for Chromium Reducing Process
-
- Shi Chonglin
- Department of Materials Science and Engineering, Tokyo Institute of Technology
-
- Li Zhi
- Graduate Student in Department of Materials Science and Engineering, Tokyo Institute of Technology
-
- Liu Yuxing
- Department of Materials Science and Engineering, Tokyo Institute of Technology
-
- Kobayashi Yoshinao
- Laboratory for Zero-Carbon Energy, Institute of Innovative Research, Tokyo Institute of Technology
抄録
<p>Thermodynamic data of chromium oxide activities in molten slags are important for improvement of the reduction treatment process of chromium oxides in stainless steel slags. The chemical equilibrium experiments were conducted in the present work to measure the activity coefficients of chromium oxides in the CaO–CaF2–MgO–Al2O3–SiO2–MnO–CrOx slags at 1823 K (1550°C) under oxygen partial pressure of 2.57×10−11 atm with different chromium oxides contents. It is found that no solid phase appears in the slag when the initial CrO1.5 mole fraction of the slag is no more than 0.00390 (0.5 mass%), which could ensure the accuracy of the chromium valence analysis. The activity coefficient of CrO keeps almost constant with the increase of mole fraction of total chromium oxides, which indicates that CrO obeys Henry’s law under the present conditions. The activity coefficient of CrO1.5 firstly levels off and then rises sharply when the mole fraction of total chromium oxides reaches 0.00198, beyond this point, activity coefficient of CrO1.5 keeps relatively constant again. Through the Raman spectroscopy analysis, the sharp increase of the activity coefficient of CrO1.5 is assumed to be caused by the transformation of CrO1.5 from network former to network modifier.</p>
収録刊行物
-
- ISIJ International
-
ISIJ International 64 (6), 893-900, 2024-04-15
一般社団法人 日本鉄鋼協会
- Tweet
キーワード
詳細情報 詳細情報について
-
- CRID
- 1390862776828033152
-
- ISSN
- 13475460
- 09151559
-
- 本文言語コード
- en
-
- データソース種別
-
- JaLC
- Crossref
-
- 抄録ライセンスフラグ
- 使用不可