| Project/Area Number |
11450237
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Physical properties of metals
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
NAGATA Kazuhiro Tokyo Institute of Technology, Graduate School of Science and Engineering, Professor, 大学院・理工学研究科, 教授 (70114882)
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| Co-Investigator(Kenkyū-buntansha) |
HAYASHI Miyuki Tokyo Institute of Technology, Graduate School of Science and Engineering, Research Associate, 大学院・理工学研究科, 助手 (80302967)
FUKUYAMA Hiroyuki Tokyo Institute of Technology, Graduate School of Science and Engineering, Associate Professor, 大学院・理工学研究科, 助教授 (40252259)
SUSA Masahiro Tokyo Institute of Technology, Graduate School of Science and Engineering, Associate Professor, 大学院・理工学研究科, 助教授 (90187691)
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| Project Period (FY) |
1999 – 2000
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥14,800,000 (Direct Cost: ¥14,800,000)
Fiscal Year 2000: ¥4,100,000 (Direct Cost: ¥4,100,000)
Fiscal Year 1999: ¥10,700,000 (Direct Cost: ¥10,700,000)
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| Keywords | arc Plasma / electrochemistry / slag / evaporation / refractivity / arc plasma / electrochemistry / vaporization / slag / ash |
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| Research Abstract |
The behavior of oxides FeO-SiO_2 melted by Ar arc plasma has been investigated. A direct-current transfer/non-transfer-hybrid-type generator was employed. A cavity was formed at the arc spot of plasma and the depth was determined by the balance between the hydrostatic pressure and the sum of the pressure caused from both of the arc and the gas flow. Molten slag on the surface flowed from center to the edge of melt because of aerodynamic drag force. FeO-SiO_2 glasses cont aining Zn were melted by Ar-O_2 plasma arc. From spectroscopic measurement, the parial pressure of Zn vapor exponentially decreased with time. The evaporation rate of Zn at the plasma spot is controlled by diffusion in gas phase and decreases with increasing the partial pressure of oxygen. 40CaO-40SiO_2-20Al_2O_3 (mass%) slag and that containing iron oxide were melted by Ar plasma arc. Fe^<3+> in molten slag was rapidly reduced to Fe^<2+>. Then, the evaporation rate is affected by the partial pressure of oxugen. 25mol%Na_2O-75mol%SiO_2 molten slag was electrically analyzed by transfere-arc plasma with ironplate as a anode. The amount of oxidation of iron at the anode was according to Faraday's law. Then, the reaction of Na_2O+Fe→FeO+2Na^++2e takes place. The ratio of Na/Si increased and the amount of SiO gas evaporated in 100 to 1000 times larger than that expected by Faraday's law. Then, the reaction of SiO_2(slag)+2e→SiO(g)+O^<2-> (slag) would take place at the surface of molten slag with the electro-neutrality reaction of SiO_2(slag)+2e+2Ar^+→SiO(g) +(1/2)O_2+2Ar.
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