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염화암모늄에 의한 Chalcopyrite 의 선택 염소화 반응
김재용,유영홍 ( J . Y . Kim,Y . H . Yoo ) 한국화학공학회 1991 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.29 No.1
The selective chlorination of FeS in the chalcopyrite with NH₄Cl was investigated to find a new process for the separation FeS and CuS in the chalcopyrite. The proper conditions for this selective chlorination were that reaction temperature 375℃, reaction time 30 min, NH₄Cl weight ratio to the clalcopyrite 11.0 and particle size of chalcopyrite -325 mesh in the N₂ atmosphere. Under the above mentioned conditions FeS in the chalcopyrite was converted to FeCl₂, selectively. Synthetic CuS was produced by the leaching the chlorinated product with H₂O was identified as covellite structure and was found to contain 55.89% Cu.
김재용(J-Y Kim),윤경호(K-H Yoon),송기남(K-N Song),이강희(K-H Lee) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
The spacer grid plays important function of preventing lateral impact force by seismic and LOCA blowdown and maintaining the fuel rod space under accidental and operational loading conditions. There are many mechanical and structural performance tests for spacer grid(SG) such as spring characterization test, fuel rod vibration test, fretting wear test and impact test, etc. In KAERI, a pendulum type impact test has been used to evaluate the impact characteristics such as impact velocity, critical strength and duration time. The real impact test for one specimen has usually been carried out using many different angle values, so repeated loading analysis has been conducted with changing initial velocities. In this study, the lateral impact analysis of 2by2 type partial SG rather than 16by16 type is performed to establish the method of repeated impact analysis and to compare with the single impact analysis results. The repeated analysis model will be extended to big size of SG.
선용접방법으로 제작된 16×16 최적화 H형 스프링 지지격자에 대한 진자식충격시험
김재용(J-Y Kim),윤경호(K-H Yoon),송기남(K-N Song) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
The General roles of a spacer grid(SG) are providing a lateral and vertical support for fuel rods, promoting a mixing of coolant and keeping guide tubes straight so as not to impede a control rod insertion under any normal or accidental conditions. To evaluate the impact characteristics of a SG such as impact velocity, critical buckling strength and duration time, a few types of impact tests for SGs have been conducted. In a previous study, a new welding method, a through-welding method, was proposed to increase critical buckling strength of a SG without any design change or material change and was verified by impact tests with 1×7 partial SG specimens. In this paper, the effect of through-welding method in case of a 16×16 full-size SG is investigated by pendulum impact tests with 16×16 SG specimens. And the increase of critical buckling strength for full-size SGs is measured by comparison with impact results of spot-welded and through-welded SGs.
국부좌굴에 영향을 미치는 셀 구조물의 기하학적 불균일성에 대한 평가
김재용(J-Y Kim),윤경호(K-H Yoon),송기남(K-N Song) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
The nuclear fuel assembly is consisted of one top/bottom nozzle, about 240 fuel rods, and approximately 10 spacer girds in the case of 16 by 16. The spacer grid plays important function of preventing impact failure by seismic and LOCA blowdown forces and supporting the fuel rods vertically. There are many mechanical and structural performance tests for spacer grid such as the performance of the grid spring, fuel rod vibration, fretting wear resistance, and the impact strength. A pendulum impact tester has been used to evaluate the impact characteristics such as impact velocity, critical strength and duration time. In the grid structure, there are two types of cell, one is fuel rod cell and the other is guide tube cell. In the impact test, the local buckling usually occurred around guide tube cell. Therefore, the effect of geometrical non-uniformity of the guide tube cell for local buckling has been investigated by considering guide tube cell configuration using the commercial FE code.
고속궤도차량의 로드휠과 궤도의 접촉 강성 및 감쇠계수에 대한 실험적연구
김종수(J.S.Kim),방동창(D.C.Park),김재용(J.Y.Kim),최진환(J.H.Choi) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_2
An experimental study is presented for the contact property of the interactions between road wheel and track link in order to identify the dynamic characteristics of the tracked vehicle along the vertical direction and the loading conditions. The revolving rubber molded track link and road wheels are subjected to the reaction forces from the ground, the traction forces from the engine which lead to the tension, compression, and torsional load as the operational conditions and environment. The dynamic effect of the contact stiffness and damping coefficients between road wheel and track link is illustrated by using experimental methods which can be used to the dynamic simulation of the multibody tracked vehicle.