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Equilibrium between molten CaO-based slags and iron alloys and activities of slag components

Research Project

Project/Area Number 61550495
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 金属精錬・金属化学
Research InstitutionNagoya University

Principal Investigator

FUJISAWA Toshiharu  Faculty of Engineering, Nagoya University Research Associate, 工学部, 助手 (20115629)

Project Period (FY) 1986 – 1988
Project Status Completed (Fiscal Year 1988)
Budget Amount *help
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1988: ¥200,000 (Direct Cost: ¥200,000)
Fiscal Year 1987: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1986: ¥1,200,000 (Direct Cost: ¥1,200,000)
KeywordsMolten slag / Activity / Equilibrium / Calcium aluminate / Ultra clean steel / カルシア
Research Abstract

Calicia-based slags play an important role in the ladle deoxidation and desulfurization process, particularly in the production of clean steel. The CaO-Al_2O_3 system is one of the fundamental systems of the calcia-based slags, and there have been many reports on the thermodynamics of this system. However, a great discrepancy is apparent among these reports.
Difficulties may be anticipated in the precise determination of the activities of the components in steelmaking slags at high temperature. Instead of measuring the absolute value of the activity of each component, measurement of the activity ratio may make the experiment much easier.
On the other hand,one of bottle necks of the experimental study in the high temperature physical chemistry may be crucible materials. To avoid the sample contamination by crucible materials and the effect of the crucible materials on the reactions concerned, high temperature resistance inert materials are required.
In the present experiment, on the contra … More ry, CaS crucibles were manufactured, and CaO-AlResearcho@>D2O<@D23@>Dag and molten iron alloy were brought into equilibrium with the crucible at 1600 c. Therefore, CaS took part in the chemical reactions.
The equilibrium relation between the slag and molten iron alloy can be represented by the equation: 3CaO + 2Al + 3S = 3CaS + Al_2O_3, and the product of the activities of aluminum and sulfur in molten iron alloy (hA1^2・hs^3) has a constant value for a fixed slag composition.
By application of the Gibbs-Duhem equation, integration techniques have been developed which allow the activities of CaO and Al_2O_3 in the slags to be determined from the relation between (hA1^2・hs^3) and the slag composition. In the activity calculation, any thermodynamic data are not required except the phase diagram of the CaO-Al_2O_3 system and the activity coefficients of aluminum and sulfur in molten iron, those have relatively high accuracies. Therefore, the activities of CaO and Al_2O_3 could be determined without any accumulation of inaccuracies in the use of any other thermodynamic data. Less

Report

(4 results)
  • 1988 Annual Research Report   Final Research Report Summary
  • 1987 Annual Research Report
  • 1986 Annual Research Report
  • Research Products

    (3 results)

All Other

All Publications (3 results)

  • [Publications] 藤澤敏治: 鉄と鋼. 75. (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] Toshiharu Fujisawa: "Equilibrium between CaO-Al_2O_3-CaSsat. slags and molten iron alloys" Tetsu-to-Hagane. 75. (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1988 Final Research Report Summary
  • [Publications] 藤澤敏治: 鉄と鋼. 75. (1989)

    • Related Report
      1988 Annual Research Report

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Published: 1987-03-31   Modified: 2016-04-21  

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