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방사성폐기물의 화학처리공정에 사용되는 유동관식 장치의 해석 : 물질전달 수율에 미치는 매개변수들의 민감도
유재형,이병직,심준보,김응호,Yoo, Jae-Hyung,Lee, Byung-Jik,Shim, Joon-Bo,Kim, Eung-Ho 한국방사성폐기물학회 2007 방사성폐기물학회지 Vol.5 No.1
It was intended in this study to investigate the effects of various parameters on the chemical reaction or mass transfer yield in a tubular-type nuclear waste treatment equipment. Since such equipments, as a tubular reactor, multistage solvent extractor, and adsorption column, accompany chemical reaction or mass transfer along the fluid-flowing direction, mathematical modeling for each equipment was carried out first. Then their behaviors of the chemical reaction or mass transfer were predicted through computer simulations. The inherent major parameters for each equipment were chosen and their sensitivities. affecting the reaction or mass transfer yield were analyzed. For the tubular reactor, the effects of axial diffusion coefficient and reaction rate constant on the reaction yield were investigated. As for the multistage solvent extractor, the backmixing of continuous phase and the distribution coefficient between fluid and solvent were considered as the major parameters affecting the extraction yield as well as concentration profiles throughout the axial direction of the extractor. For the adsorption column, the equilibrium constant between fluid and adsorbent surface, and the overall mass transfer coefficient between the two phases were taken as the major factors that affect the adsorption rate.
γ - Alumina 로부터 흡착질의 열탈착에 관한 연구
문세기,김형진,심준보 ( Sei Ki Moon,Hyung Jin Kim,Joon Bo Shim ) 한국화학공학회 1984 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.22 No.2
Thermal desorption has been studied or γ-alumina which adsorbed adsorbates, such as benzene, cyclohexane, methylalcohol, ethylalcohol, n-propylalcohol and iso-propylalcohol, separately at 20℃ with Gas Chromatogrphic apparatus. As the temperature of adsorbent was raised from 20℃ to 350℃ with the constant heating rates(5-15 ℃/min), the species on adsorbent surface were desorbed, and thermal conductivity detector was employed to monitor the desorbate in effluent gas. The thermal desorption chromatogram was investigates to obtain the information about the active sites, behavior of desorbed phase with increasing temperature and the adsorbate-adsorbent interation. By means of the temperature at peak maximum, T_m the desorption kinetic parameters, e.g., activation energy of desorption and frequency factor were determined. It was found that γ-alumina had two kinds of active sites different in their property for alcohols. Experimental results represented that the desorption rate was first order with respect to the surface coverage.
강영호,이종현,황성찬,심준보,김응호,Kang, Young-Ho,Lee, Jong-Hyeon,Hwang, Sung-Chan,Shim, Joon-Bo,Kim, Eung-Ho 한국방사성폐기물학회 2007 방사성폐기물학회지 Vol.5 No.1
흑연음극을 이용하여 LiCl-KCl공융염내에서 금속우라늄의 전해정련을 수행하였다. Uraniurn-Graphite Intercalation Compound(U-GIC)의 형성에 의하여 우라늄 전착물의 sell-scraping이 일어나며 전해정련에서 stripping과정을 생략함으로서 전해효율을 높일 수 있다. 우라늄 전착물내의 희토류 원소 오염은 무시할 만 하였으나 약 300ppm정도의 탄소가 오염되어 있는 것으로 관찰되었다. 탄소 오염은 이트륨을 이용한 정제공정 등을 거칠 경우 제거 가능하리라 사료된다. 회수된 우라늄 전착물의 조직 특성을 분석하였으며, 스틸 음극에 의해 회수된 전착물과 비교하였다. 이 결과는 초기 실험결과 이며 보다 심층적 연구를 통하여 사용 후 금속핵연료의 전해정련 개념을 개선시킬 수 있을 것으로 판단된다.
액체음극에서의 금속 수지상 성장 억제를 위한 교반기 성능평가
김시형,윤달성,유영재,백승우,심준보,안도희,Kim, Si-Hyung,Yoon, Dal-Seong,You, Young-Jae,Paek, Seung-Woo,Shim, Joon-Bo,Ahn, Do-Hee 한국방사성폐기물학회 2009 방사성폐기물학회지 Vol.7 No.2
An electrolytic system (zinc anode-gallium cathode) was setup to evaluate the performance of several stirrers prepared for this study, where stirrers have been used to prevent uranium from forming dendrite on the cathode in pyrochemical process. In the case of no-stirring condition, zinc dendrites began to grow on the gallium surface in 1 hour and some dendrite grew out of the cathode crucible around 6 hours. When a rectangular stirrer or a tilt stirrer was rotated, at 40${\sim}$150 rpm, to mix the liquid gallium cathode, dendritic growth of zinc metal was prevented irrespective of revolution speed, but some of the deposits overflowed out of the cathode crucible owing to the large centrifugal forces at 150 rpm. The harrow stirrer did not nearly retard the dendrite growth at 40 rpm, but the dendrite growth was retarded at higher than 100 rpm and the zinc deposits also did not overflow at 150 rpm. Pounder could also prevent the dendrite growth to some extent but it had some difficulties in operation compared with other types of stirrers.
불화물 / 염화물 용융염을 이용한 우라늄금속의 전해정련에 관한 연구
강영호(Young Ho Kang),황성찬(Sung Chan Hwang),심준보(Joon Bo Shim),유재형(Jae Hyung Yoo) 한국공업화학회 2002 공업화학 Vol.13 No.1
본 연구에서는 KCI-LiCl과 LiF-NaF-KF(FLINAK)용융염에서 금속우라늄과 회토류를 원료물질로 하여 전해정련을 수행하였다. 음극 전착물의 주성분은 우라늄이었으며 다른 회토류 금속에 대한 우라늄의 분리계수는 염화물 용융염의 차이는 없었다. 용융염과 전착물내의 회토류의 농도는 회토류의 분해전압인 1.9V 이상의 인가전압에서 급격히 증가하였으며, 전류효율은 1.0~1.9V내에서 인가전압에 반비례하였다. The electrorefining experiments with an anode composed of U, Y, Gd, Nd and Ce were carried out in the KCl-LiCl and LiF-NaF-KF(FLINAK) eutectic melt at 500℃ and 600℃, respectively. Uranium was the major component in the cathode deposits, and the separation factors of uranium with respect to the rare earths (REs) were nearly same in both electrolytes. REs concentrations in the molten salts and cathode deposits increased sharply at above 1.9 V, which was decomposition voltage of REs. The current efficiency was inversely proportional to the applied voltage in the range of 1.0 V to 1.9 V (vs STS304 and Ni).
고-액 분리법을 이용한 LCC 도가니에서의 카드뮴 회수에 관한 연구
박대엽 ( Dae Yeob Park ),김태진 ( Tack Jin Kim ),김지용 ( Jiyong Kim ),김경량 ( Kyung Ryang Kim ),김시형 ( Si Hyung Kim ),심준보 ( Joon Bo Shim ),백승우 ( Seungwoo Peak ),안도희 ( Do Hee Ahn ) 조선대학교 공학기술연구원 2011 공학기술논문지 Vol.4 No.4
This study was carried out to reduce the problem during distillation process, which separate U, TRU (TRans Uranium) metal electro deposit, Cd and LiCl-KCl eutectic salt generating from LCC (Liquid Cadmium Cathode) electro winning process. The cadmium recovering apparatus was manufactured to separate for each metal using solid-liquid separation method. The apparatus consists of the first sieve for the separation of U and TRU metal electrodeposit, the second sieve for the separation of LiCl-KCl eutectic salt, cadmium collection basket, and a heating furnace. In addition, the size of each sieve is 2 mm to 3 mm. In this experiment, a metal wire was employed to replace TRU metal electrodeposit and U, which exist actually in a LCC crucible. In the solid state, The LiCl-KCl is separated at 340℃ at which the solid and the liquid of the remaining cadmium and LiCl-KCl eutectic salt coexists in each, after the metal wire separated at 500℃. As a result, it seems that it would be beneficial to set the processing condition in the distillation process with the additional treatment process of cadmium and LiCl-KCl eutectic salt.