Determination of Equilibrium Constant of Calcium Oxidation by Slag-Metal Equilibrium Distribution Method
-
- Seki Ichiro
- National Institute of Technology, Tsuyama College
この論文をさがす
抄録
<p>The equilibrium constant of calcium oxidation is important to evaluate the ability of deoxidation of the dissolved oxygen in metals and the reduction of metal-oxide. Therefore, in this study, the equilibrium constant for calcium oxidation has been determined by a slag-metal equilibrium distribution method by using molten iron and/or titanium-based alloys. In general, this method can be used to determine the equilibrium constant for solved elements, e.g., as expressed by “CaO(s) = Cain metal + Oin metal”. When the oxygen partial pressure and the activity of calcium in the surroundings are established, the equilibrium constant of “CaO(s) = Ca(l, g) + 1/2O2(g)” is determined to be log[K] = −17.50 for titanium-based alloys at 1473 K and log[K] = −12.91 for molten iron at 1873 K. These values are essentially medians obtained using an experimental measurement of the oxygen partial pressure and are based on the definition of the activity of calcium in the slag as given in literature. The temperature dependence of these results has been determined as follows:</p><p>log[K] = 4.814 − 32960 (1/T) (1473–1873 K)</p><p>or</p><p>ΔG° = 631 − 0.0922T [kJ/mol] (1473–1873 K)</p>
収録刊行物
-
- MATERIALS TRANSACTIONS
-
MATERIALS TRANSACTIONS 61 (5), 985-992, 2020-05-01
公益社団法人 日本金属学会
- Tweet
キーワード
詳細情報 詳細情報について
-
- CRID
- 1390848250106598144
-
- NII論文ID
- 130007835693
-
- NII書誌ID
- AA1151294X
-
- ISSN
- 13475320
- 13459678
-
- NDL書誌ID
- 030381061
-
- 本文言語コード
- en
-
- データソース種別
-
- JaLC
- NDL
- Crossref
- CiNii Articles
-
- 抄録ライセンスフラグ
- 使用不可