1991 Fiscal Year Final Research Report Summary
Thermodynamics of nitrogen in flux melts
| Project/Area Number |
02453055
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
金属精錬・金属化学
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| Research Institution | The University of Tokyo |
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Principal Investigator |
SANO Nobuo The University of Tokyo, Faculty of Engineering, Department of Metallurgy, Professor, 工学部, 教授 (50010749)
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| Co-Investigator(Kenkyū-buntansha) |
SUZUKI Kichiya The University of Tokyo, Faculty of Engineering, Department of Metallurgy, Resea, 工学部, 助手 (00092247)
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| Project Period (FY) |
1990 – 1991
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| Keywords | thermodynamics / nitrogen / solubility / glass / slag / boron oxide / boron nitride |
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| Research Abstract |
The purpose of present study is to investigate the thermodynamic properties of nitrogen in the various flux systems. The flux composition ranged from acidic side which is used in the glass production to basic side used for the steelmaking. The solubilities of BN in the B_2O_3-Li_2O, B_2O_3-Na_2O, B_2O_3-Rb_2O, B_2O_3-Cs_2O, B_2O_3-CaO, B_2O_3-BaO, B_2O_3-Al_2O_3, B_2O_3-Y_2O_3 and B_2O_3-La_2O_3 melts have been measured at temperatures ranging from 1273 to 1823K by using a chemical equilibration technique. A molten flux was equilibrated with BN or nitrogen gas in a graphite crucible and the nitrogen content in flux was analyzed.
The addition of basic oxides to B_2O_3 up to a certain content increases the BN solubility and nitride capacity, and then decreases it as they are added further. The BN solubility gradually decreases by the addition of Al_2O_3, Y_2O_3 and La_2O_3 and their effect to decrease the BN solubility is smaller than that Of SiO_2. The BN solubilities in the B_2O_3-basic oxide systems increase with temperature and the enthalpy change of dissolution of BN into melts decreases with the addition of basic oxides.
The thermodynamics of nitrogen in B_2O_3 melts was investigated in this study.
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