1994 Fiscal Year Final Research Report Summary
Thermodynamic Study of Secondary Refining Slag for Steelmaking
| Project/Area Number |
05650722
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Metal making engineering
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| Research Institution | TOHOKU UNIVERSITY |
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Principal Investigator |
HINO Mitsutaka Tohoku University, Faculty of Engineering, Professor, 工学部, 教授 (10091729)
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| Co-Investigator(Kenkyū-buntansha) |
BAN-YA Shiro Akita National College of Technology, President, 校長 (90005223)
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| Project Period (FY) |
1993 – 1994
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| Keywords | Secondary Refining for Steelmaking / Dephosphorization / Desulphurization / High Purity Steel / Sulphide Capacity / Activity / Sulphur Solubility in Slag / Thermodynamics |
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| Research Abstract |
Various kinds of fluxed for dephosphorization and desulphurization of steel have been developed to produce high purified steel. Practically used flux is CaO-based flux and steel is deoxidized with aluminum in secondary steelmaking proces. As the result, CaO-Al_2O_3 slag is formed in the process. In the present work, at first, the sulphide capacities and sulphur solubility for CaO-Al_2O_3, CaO-Al_2O_3-MgO,CaO-Al_2O_3-SiO_2 and CaO-Al_2O_3-CaF_2 slags were studied at 1823 to 1923K to discuss the desulphurization ability of these slags in the secondary steelmaking process.
Secondary, the activities of the constituents in these slags were determined at 1823 to 1923 K to estimate the equilibrium oxygen distributed between these slags and liquid iron.
From the results obtained, the equilibrium sulphur distribution between these slags and liquid steel was evaluated on the assumption that the steel would be deoxidized with aluminum., and these were compared with the experimentally observed results.
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