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비등온 열중량법에 의한 AUC분말의 열분해 특성해석
Thermal Decomposition Characteristics of AUC Powder by Non-Isothermal Method
HWAHAK KONGHAK, February 1999, 37(1), 14-20(7), NONE
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Abstract
AUC(ammonium uranylcarbonate) 분말의 배소·환원에 대한 연구를 수소분위기에서 TG-DTA를 사용하여 수행하였다. AUC 분말의 열분해 과정 중 다양한 상 변화 특성을 XRD로 확인하였다. AUC 분말의 열분해 반응 메카니즘은
(NH4)4[UO2(CO3)3]→UO3+3CO2+4NH3+2H2O
3UO3+H2→U3O8+H2O
U3O8+H2→3UO2+H2O
와 같은 3단계로 나타났다. AUC 분말의 배소·환원 속도는 비등온 열중량법으로 구하였으며, 데이터해석은 Osawa 방법과 Zsako 방법으로 구하였는데 다음과 같다.
(NH4)4[UO2(CO3)3]→UO3+3CO2+4NH3+2H2O
3UO3+H2→U3O8+H2O
U3O8+H2→3UO2+H2O
와 같은 3단계로 나타났다. AUC 분말의 배소·환원 속도는 비등온 열중량법으로 구하였으며, 데이터해석은 Osawa 방법과 Zsako 방법으로 구하였는데 다음과 같다.
| Reaction | Mechanusm | E(Kcal/mole) |
|---|---|---|
| AUC→UO3 | 2nd nucleation and growth | 19.5 |
| UO3→U3O8 | 3nd nucleation and growth | 30.12 |
| U3O8→UO2 | 4th nucleation and growth | 31.43 |
Calcination and reduction of AUC(ammonium uranylcarbonate) have been carried out by using TG-DTA in H2 atmosphere. Phases of various intermediates obtained during thermal analysis of AUC were confirmed by XRD. As results, AUC was calcined and reduced by three steps as follows;
(NH4)4[UO2(CO3)3]→UO3+3CO2+4NH3+2H2O
3UO3+H2→U3O8+H2O
U3O8+H2→3UO2+H2O
The calcination and reduction kinetics of AUC have been also determined by non-isothermal method and the analysis of kinetic data was made by Osawa and Zsako methods. The results were as follows;
(NH4)4[UO2(CO3)3]→UO3+3CO2+4NH3+2H2O
3UO3+H2→U3O8+H2O
U3O8+H2→3UO2+H2O
The calcination and reduction kinetics of AUC have been also determined by non-isothermal method and the analysis of kinetic data was made by Osawa and Zsako methods. The results were as follows;
| Reaction | Mechanusm | E(Kcal/mole) |
|---|---|---|
| AUC→UO3 | 2nd nucleation and growth | 19.5 |
| UO3→U3O8 | 3nd nucleation and growth | 30.12 |
| U3O8→UO2 | 4th nucleation and growth | 31.43 |
References
원자력 장기발전 종합계획(2차 시안), 과학기술처 (1990)
Wacklington JS, Raven LF, Thorpe, Br. Nucl. Energy Soc., 18, 283 (1979)
Kim BK, Chang IS, Hwang ST, Park JH, Kim EH, Park JJ, Choi CS, Chem. Ind. Technol., 9, 373 (1991)
Assmann H, Doerr W, "Ceramic Powders," Material Science Monographs 16, Elsevier, 707 (1983)
Assmann H, Bairiot H, IAEA Tech. Report Ser., No. 221, 149 (1983)
Chang IS, Proceedings of the 2nd Korea-Japan Symposium on Separation Technology, Seoul, 519 (1990)
Halldahl L, Nygrem M, J. Nucl. Mater., 138, 99 (1986)
Corfunke EHP, "The Chemistry of Uranium," Elsevier Pub. Co. (1969)
Friedman HL, Polym. Lett., 7, 41 (1969)
Freeman ES, Carroll B, J. Phys. Chem., 62, 394 (1958)
Doyle CD, J. Appl. Polym. Sci., 15, 285 (1961)
Zsako J, J. Phys. Chem., 72(7), 2406 (1968)
Ozawa T, Bull. Chem. Soc. Jpn., 38, 1881 (1965)
Ge Q, Kang S, Thermochim. Acta, 116, 71 (1987)
Kim EH, Park JJ, Park JH, Chang IS, Choi CS, Kim SD, J. Nucl. Mater., 209, 294 (1994)
Halldahl L, Toft Sorensen O, Proc. 6th Int. Conf. on Thermal Analysis, Bayrath, Germany, 499 (1980)
Notz, Mendel, J. Inorg. Nucl. Chem., 14, 55 (1960)
DeMarco, Mendel, J. Phys. Chem., 64, 132 (1960)
Sheila A, Trans. Faraday Soc., 57, 1400 (1961)
Dell, Wheeler, Trans. Faraday Soc., 58, 485 (1962)
Le Page, France, J. Inorg. Nucl. Chem., 36, 87 (1974)
Tompkims FC, "Treatise on Solid State Chemistry," ed. N.B. Hannay, Plenum Press, New York, 4 (1983)
Wacklington JS, Raven LF, Thorpe, Br. Nucl. Energy Soc., 18, 283 (1979)
Kim BK, Chang IS, Hwang ST, Park JH, Kim EH, Park JJ, Choi CS, Chem. Ind. Technol., 9, 373 (1991)
Assmann H, Doerr W, "Ceramic Powders," Material Science Monographs 16, Elsevier, 707 (1983)
Assmann H, Bairiot H, IAEA Tech. Report Ser., No. 221, 149 (1983)
Chang IS, Proceedings of the 2nd Korea-Japan Symposium on Separation Technology, Seoul, 519 (1990)
Halldahl L, Nygrem M, J. Nucl. Mater., 138, 99 (1986)
Corfunke EHP, "The Chemistry of Uranium," Elsevier Pub. Co. (1969)
Friedman HL, Polym. Lett., 7, 41 (1969)
Freeman ES, Carroll B, J. Phys. Chem., 62, 394 (1958)
Doyle CD, J. Appl. Polym. Sci., 15, 285 (1961)
Zsako J, J. Phys. Chem., 72(7), 2406 (1968)
Ozawa T, Bull. Chem. Soc. Jpn., 38, 1881 (1965)
Ge Q, Kang S, Thermochim. Acta, 116, 71 (1987)
Kim EH, Park JJ, Park JH, Chang IS, Choi CS, Kim SD, J. Nucl. Mater., 209, 294 (1994)
Halldahl L, Toft Sorensen O, Proc. 6th Int. Conf. on Thermal Analysis, Bayrath, Germany, 499 (1980)
Notz, Mendel, J. Inorg. Nucl. Chem., 14, 55 (1960)
DeMarco, Mendel, J. Phys. Chem., 64, 132 (1960)
Sheila A, Trans. Faraday Soc., 57, 1400 (1961)
Dell, Wheeler, Trans. Faraday Soc., 58, 485 (1962)
Le Page, France, J. Inorg. Nucl. Chem., 36, 87 (1974)
Tompkims FC, "Treatise on Solid State Chemistry," ed. N.B. Hannay, Plenum Press, New York, 4 (1983)
