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졸겔법과 수열처리에 의한 베타 리튬알루미네이트의 막대모양 결정성장
권상운,황성태,박승빈 ( Sang Woon Kwon,Sung Tai Hwang,Seung Bin Park ) 한국화학공학회 1996 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.34 No.3
Rod-like lithium aluminate was prepared by a sequence of sol-gel process and hydrothermal process. The starting materials were lithium alkoxide([(CH₃)₂CHOLi or C₂H_5CH(CH₃)OLi), aluminium alkoxide([(CH₃O₂CHO]₃Al or [C₂H_5CH(CH₃)O]₃Al), and the corresponding alcohol as a solvent. Lithium aluminate was in β-phase and there was no phase transformation after sintering at 700℃. But either plate-like or irregular shaped particles were obtained when sol-gel process was skipped or when CH₃COOH, NaOH solution or tetrapropylammonium bromide as a templating agent was added during the hydrolysis.
김응호,권상운,정지영,박진호,황성태,장인순,최청송 ( Eung Ho Kim,Sang Woon Kwon,Ji Young Jeong,Jin Ho Park,Sung Tai Hwang,In Soon Chang,Cheong Song Choi ) 한국화학공학회 1993 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.31 No.6
Ammonium uranate(AU), prepared by the reaction of UO₂(NO₃)₂ solution with NH₄OH, was thermally decomposed and reduced in a TG-DTA unit in nitrogen and hydrogen atmospheres. Various intermediate phases produced during the thermal decomposition and reduction processes of AU have been investigated by X-ray analysis and infrared spectroscope. It was found that AU was a mixture of AU II and AU III classified by Cordfunke[7], and thermally decomposed in both nitrogen and hydrogen atmospheres as the following mechanism: AU III/II→AU II→AU I→A-UO₃→β-UO₃→α-U₃O_8. In the hydrogen atmosphere, α-U₃O_8 was converted into UO₂ via U₄O_9 phase. The obtained results were compared with the published data, and the effect of nitrate ion on the thermal decomposition of AU was determined in the present study.
다상유동 전산모사를 통한 공학 규모의 cathode processor의 성능평가
유병욱,박성빈,권상운,김정국,이한수,김인태,이종현,Yoo, Bung Uk,Park, Sung Bin,Kwon, Sang Woon,Kim, Jeong Guck,Lee, Han Soo,Kim, In Tae,Lee, Jong Hyeon 한국방사성폐기물학회 2014 방사성폐기물학회지 Vol.12 No.1
용융염 전해정련공정은 사용후핵연료로부터 전기화학적인 방법을 통해 음극에서 우라늄을 회수 하는 공정이다. 이 때 우라늄은 약 30wt%의 염을 포함하고 있어 순수한 우라늄을 얻기 위해서는 염을 제거하는 Cathode Process (CP)가 필수적이다. CP는 대량의 우라늄을 처리해야 하므로 파이로공정의 난관중의 하나로 인식되고 있으며, 우라늄의 순도가 최종적으로 결정되는 단계이므로 매우 중요한 공정이다. 현재, 이에 대한 연구는 주로 실험적 방법에 근거 하고 있어 염 제거 공정 중 온도, 압력, 염 가스의 거동을 관찰하기 어렵다. 따라서 본 연구에서는, 공정의 운전 조건에 대해 적합한 수학적 모델을 이용하여 전산모사 해석을 진행하였다. 본 연구는 증류부에서 염 가스의 증류 량, 확산계수에 의해 계산된 장치 내 염 가스의 이동 그리고 응축부에서의 응결속도를 중점적으로 연구하였다. 장치내의 각각의 염 가스 거동을 정의하기 위해 Hertz-Langmuir 관계식, Chapman-Enskog Theory, ANSYS-CFX의 상용 코드를 사용하였다. 그리고 HSC Chemistry에서 염의 물성 값을 이용하여 모델을 구성하였다. 본 연구의 전산모사 해석을 통해 얻은 연구 결과를 이용하여 염 가스의 거동과 장치의 최적 운전조건을 예측하였다. 따라서 본 해석 결과는 CP의 물리적 현상을 깊게 이해하는데 쓰일 뿐 아니라, 공학규모의 CP 장치를 상용규모로 확장하는데 이용 할 수 있다. Molten salt electrorefining process achieves uranium deposits at cathode using an electrochemical processing of spent nuclear fuel. In order to recover pure uranium from cathode deposit containing about 30wt% salt, the adhered salt should be removed by cathode process (CP). The CP has been regarded as one of the bottle-neck of the pyroprocess as the large amount of uranium is treated in this step and the operation parameters are crucial to determine the final purity of the product. Currently, related research activities are mainly based on experiments consequently it is hard to observe processing variables such as temperature, pressure and salt gas behavior during the operation of the cathode process. Hence, in this study operation procedure of cathode process is numerically described by using appropriate mathematical model. The key parameters of this research are the amount of evaporation at the distillation part, diffusion coefficient of gas phase salt in cathode processor and phase change rate at condensation part. Each of these conditions were composed by Hertz-Langmuir equation, Chapman-Enskog theory, and interphase mass flow application in ANSYS-CFX. And physical properties of salt were taken from the data base in HSC Chemistry. In this study, calculation results on the salt gas behavior and optimal operating condition are discussed. The numerical analysis results could be used to closely understand the physical phenomenon during CP and for further scale up to commercial level.
소듐분위기에서 물 누출로 인한 Ferrite Steel 에서의 반응현상
정경채,김병호,권상운,김광락,황성태 ( Kyung chai Jeong,Byung ho Kim,Sang woon Kwon,Kwang rag Kim,Sung tai Hwang ) 한국공업화학회 1998 공업화학 Vol.9 No.2
액체금속로 냉각재인 액체 소듐에서 시편의 누출특성을 소듐-물 반응 실험에 의해 조사하였다. 소듐-물 반응 현상의 확인은 물 누출 실험 전후에 Fe, Cr 및 Ni 등과 같은 시편의 조성 변화로 확인하였다. 100 kg/7㎠의 누출 압력으로 4시간 동안 시편의 누출 경로를 통해 물을 누출시킨 결과, 누출경로에서 소듐-물 반응생성물들이 침적되어 있는 것을 확인하였으나, 부식에 의해 누출경로가 완전 파열되어 다량의 수중기가 액체 소듐속으로 빠져나가는 re-openning 현상은 관찰되지 않았다. 시편의 누출경로가 막히는 self-plugging 현상은 소듐-물 반응에 의한 반응생성물과 시편의 부식에 의한 부식 생성물이 주 원인으로 추정되고, re-openning 현상은 시편의 누출경로에서 열적인 transient로 추정되었다. Water leak phenomena in the liquid sodium, which is a coolant of liquid metal reactor, were investigated by carrying out sodium-water reaction experiment. It was that sodium and water react each other by the analysis of material composition of aspecimen at the end of experiment. When steam of 100 Kg/㎠ was passed through the leak path of the specimen for 4 hours, reaction products from sodium-water reaction were observed on the leak site. However, re-openning phenomena were not observed at this condition. It was interpretted that the reaction product precipitated on leak path and thermal transient caused self-plugging and re-openning phenomena, respectively.
막힘온도 지시계를 이용한 액체 나트륨중 불순물 농도 측정
권상운,정경채,김병호,김광락,황성태,최윤동,정지영 한국공업화학회 1998 응용화학 Vol.2 No.2
The monitoring of impurity in sodium is one of the most important R&D issues to develop a liquid metal reactor. Impurity measuring experiments were carried out by a Plugging Temperature Indicator, which is an on-line impurity monitoring instrument. Plugging temperature was successfully measured at various oxygen contents with two operation modes- bare orifice mode and partially plugging mode. The relation between plugging temperature and oxygen content was calibrated from the experimental data. Further study is needed to develop a more reliable instrument.