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AUC(Ammonium Uranyl Carbonate) 열분해 반응
Thermal Decomposition Reaction of AUC(Ammonium Uranyl Carbonate)
HWAHAK KONGHAK, February 1993, 31(1), 28-35(8), NONE
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Abstract
AUC[Ammonium Uranyl Carbonate, (NH4)4UO2(CO3)3]의 열분해 실험이 열 중량분석 및 시차 열분석 장치를 사용하여 질소, 탄산가스 분위기에서 수행되었다. 특히, 환원성 분위기에 관한 연구를 위해 수소 농도를 5%에서 100%까지 변화시켰다. 중간체들의 구조를 확인하기 위해 X-ray가 사용되었다. AUC는 300℃이하에서 CO2, NH3와 H2O를 방출시키면서 사용된 분위기에 관계없이 무정형의 UO3로 열분해되었으며 온도를 더 증가시키면 공통적으로 무정형 UO3로부터 α-UO3, α-UO3O8상을 거치게 되면 수소 분위기의 경우 UO2까지 환원되었다. 분위기 가스에 따른 중간체 생성조건(반응온도, 반응열, 열분해후 잔류량)들이 제시되었고, 또한 분위기 가스가 중간체 생성조건에 미치는 영향이 검토되었다.
The thermal decomposition of AUC[Ammonium Uranyl Carbonate(NH4)4UO2(CO3)3] has been carried out by using TG(Thermo-Gravimetric Analysis) and DTA(Differential Thermal Analysis)in N2, CO2, and H2 atmospheres, respectively. For studying the AUC thermal decomposition in reducing atmospheres hydrogen concentration was varied from 5 to 100%. Various intermediate phases produced from AUC decom-position with different atmospheres were confirmed by X-ray analysis. With release of CO2, NH3, and H2O, AUC was decomposed to amorphous UO3 up to 300℃. On further heating, the amorphous UO3 was transform-ed to α-U3O8 via α-UO3 regardless of applied atmospheres. α-U3O8 was further reduced to UO2 only in a hydrogen atmosphere. Formation temperature of intermediates, heat of reaction and residual amounts remai-ned in decomposed amorphous UO3, etc. were presented. Also, effects of applied atmospheres on these para-meters were discussed.
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