NaO<SUB>0.5</SUB>-CO<SUB>2</SUB>-FeO<SUB>1.5</SUB>系スラグの熱力学

• 福山 博之

  名古屋大学工学部材料機能工学科

• 和田 英作

  名古屋大学工学部材料機能工学科

• 藤澤 敏治

  名古屋大学工学部材料機能工学科

• 山内 睦文

  名古屋大学工学部材料機能工学科

書誌事項

タイトル別名

• Thermodynamics of NaO<SUB>0.5</SUB>-CO<SUB>2</SUB>-FeO<SUB>1.5</SUB> Slag
• NaO0.5-CO2-FeO1.5系スラグの熱力学
• Na O0.5 CO2 Fe O1.5ケイ スラグ ノ ネツリキガク

抄録

Thermodynamic properties of NaO_0.5-CO₂-FeO_1.5 slag have been investigated for the application of sodium carbonate slag to the elimination of Fe from molten copper. The activities of NaO_0.5 and Na(CO₃)_0.5 were measured by the EMF method, using beta^′′-alumina as a solid electrolyte, for various partial pressures of CO₂ at 1423 to 1523 K. There is a stable solid compound NaFeO₂ in this system, and the solubility measurement of this compound into sodium carbonate melt at 1523 K revealed that the solubility is very limited and controlled by the partial pressure of CO₂. The dissolution reaction seems to proceed according to the following reaction and Fe exists as FeO₃³⁻ anion in the sodium carbonate-based melt.<BR>(This article is not displayable. Please see full text pdf.) <BR>\oindentThe standard free energy change for the following reaction:<BR>(This article is not displayable. Please see full text pdf.) <BR>\oindentwas also determined by the EMF method as:<BR>(This article is not displayable. Please see full text pdf.) <BR>\oindentThe activity of FeO_1.5 in the (solid NaFeO₂+liquid) two phase region could be calculated from the activity of NaO_0.5 via the above equilibrium relation. Distribution equilibrium measurements were also conducted for Fe between the slag and molten copper at 1523 K not only to confirm the calculated results but also to determine the activity of FeO_1.5 in the homogeneous liquid region of the slag. The activity coefficient of FeO_1.5 in the homogeneous liquid region has a constant value for a constant CO₂ partial pressure, independent of the concentration.

収録刊行物

• 日本金属学会誌

  日本金属学会誌 57 (10), 1149-1157, 1993

  公益社団法人 日本金属学会

キーワード

• thermodynamics
• activity
• sodium carbonate slag
• NaO<SUB>0.5</SUB>-CO<SUB>2</SUB>-FeO<SUB>1.5</SUB> slag
• NaFeO<SUB>2</SUB>
• iron
• copper
• electronmotive force method

詳細情報

• CRID: 1390282681466843392
• NII論文ID: 130007340888
• NII書誌ID: AN00187860
• DOI: 10.2320/jinstmet1952.57.10_1149
• ISSN: 18806880
• ISSN: 24337501
• ISSN: 00214876
• NDL書誌ID: 3853272
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I3853272
• Web Site: https://www.jstage.jst.go.jp/article/jinstmet1952/57/10/57_10_1149/_pdf
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