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Ca(OH)<sub>2</sub>를 이용한 레늄 산화물의 포집반응 특성 연구
이태교 ( Tae-kyo Lee ),은희철 ( Hee-chul Eun ),최정훈 ( Jung-hoon Choi ),이기락 ( Ki-rak Lee ),한승엽 ( Seung-youb Han ),박환서 ( Hwan-seo Park ) 대한금속재료학회(구 대한금속학회) 2017 대한금속·재료학회지 Vol.55 No.1
The objective of this study was to obtain basic data for trapping gaseous technetium (Tc) oxide generated from the voloxidation process in spent nuclear fuel pyroprocessing. Rhenium (Re) and Ca(OH)<sub>2</sub> were used as surrogates for the technetium and a trapping material, respectively. The trapping characteristics of rhenium oxide were investigated with changing temperatures and molar ratios of calcium (Ca) over rhenium, and the thermal behaviors of the trapping products were observed. The products following after the trapping test were identified as Ca(ReO<sub>4</sub>)<sub>2</sub> and Ca<sub>5</sub>Re<sub>2</sub>O<sub>12</sub>. The conversion to Ca5Re<sub>2</sub>O<sub>12</sub> was preferred with increasing temperatures, and the trapping products were completely converted into Ca<sub>5</sub>Re<sub>2</sub>O<sub>12</sub> under conditions exceeding 800 ℃, or when maintained at 750 ℃ for 4 hr. The trapping efficiency at a molar ratio of 2.5 (Ca:Re=5:2) was significantly superior to that at the molar ratio of 2. (Received July 6, 2016; Accepted July 29, 2016)
LiCl-KCl 공융염 내 희토류 및 악티나이드 핵종의 인산화반응 거동 연구
최정훈 ( Jung Hoon Choi ),은희철 ( Hee Chul Eun ),이기락 ( Ki Rak Lee ),박환서 ( Hwan Seo Park ),박근일 ( Geun Il Park ) 조선대학교 공학기술연구원 2014 공학기술논문지 Vol.7 No.4
In this study, the phosphorylation reaction of rare-earth elements that is nuclide separation process for the recycling the LiCl-KCl waste salt generated from pyrochemical process has been investigated. The energy profiles of phosphorylation reaction for 4 kinds of rare-earth nuclide (La, Ce, Pr, and Nd), and the reaction pathways according to the phosphorylation agent of K3PO4-Li3PO4 were analyzed by first-principles calculation. It is found that the phosphorylation of La, Ce, Pr, and Nd rare-earth nuclides proceeds by exothermic reaction under the phosphorylation agent of K3PO4-Li3PO4, and rare-earth phosphates lead to form energetically stable crystals (or precipitates) due to the high energy barrier of reverse reaction. Also, ion energy calculation revealed that K3PO4 is easily ionized and converted to rare-earth phosphate relative to Li3PO4 as well as K3PO4 acts as phosphorylation agent to Li+ ion thus leading to formation of Li3PO4. This explains the experimental result why only Li3PO4 precipitates exist after phosphorylation reaction under excess amount of K3PO4-Li3PO4 agent. Furthermore, through the energy profile calculation of actinide nuclide, it is estimated that the trace of actinide nuclide in the LiCl-KCl waste salt could be also separated from the waste salt by the phosphorylation reaction promoted by K3PO4-Li3PO4 agent. Consequently, it is considered that the energy profile study on the phosphorylation reaction could be also applicable to the estimation of phosphorylation reaction pathways between other types of phosphorylation agent and rare-earth or trace of actinide nuclide for design of the efficient nuclide separation process.
Invar 36 합금 선재의 미세조직에 미치는 냉간 인발 및 열처리 공정의 영향
한승엽 ( seung Youb Han ),장선아 ( Seon Ah Jang ),은희철 ( Hee-Chul Eun ),최정훈 ( Jung-Hoon Choi ),이기락 ( Ki Rak Lee ),박환서 ( Hwan Seo Park ),안도희 ( Do-Hee Ahn ),김수영 ( Soo Young Kim ),김재열 ( Jea Youl Kim ),신상용 ( San 대한금속재료학회(구 대한금속학회) 2016 대한금속·재료학회지 Vol.54 No.10
In this study, the effect of cold drawing and heat treatment on the microstructure of Invar36 alloy wire was investigated. Invar36 alloy wire is used as a transmission line core material, and is required to have high strength. The diameter of the Invar36 alloy wire specimens were reduced from 16 mm to 4.3 mm after three cold drawing and two heat treatment processed, thereby increasing tensile strength. Specimens were taken after each of the cold drawing and heat treatment processes, and their microstructure and tensile properties were analyzed. The Invar36 alloy γ-(Fe, Ni) phase matrix before the cold drawing and heat treatment processes. After the cold drawing processes, {220} and {200} textures were mainly achieved. After the heat treatment processes, a {220} recrystallization γ-(Fe, Ni)phase was formed with fine carbides. The recrystallization γ-(Fe, Ni) phase grains had low dislocation density, so they probably accommodated a large amount of deformation during the cold drawing processes.
이기락,김종우 청주대학교 산업과학연구소 1995 産業科學硏究 Vol.13 No.-
In order to determine the tensile strength of rock, direct and various indirect methods have been conducted, which are Brazilian tensile test bending test and ring test. In this study, those tests including shear tests for some granite and cement mortar were performed, and their brief results are presented. Direct tensile strength of cement mortar was 1/1.9 of Brazilian strength, 1/9.5 of ring test strength, and 1/4.1 of flexural strength. Brazilian tensile strength of granite was 1/4.5 of ring test strength. In the ring test, tensile strength was generally found to be decreased as relative hole radius being increased.
고영선,이기락,김종우 청주대학교 산업과학연구소 1996 産業科學硏究 Vol.14 No.-
The ground vibration induced by dropping mass is instrumented to investigate the characteristics of the impact vibration VMS-700 vibration tester of Thomas instrument Ltd. and software utilities are used to analyze test results. As impact potential energy is varied, longitudinal, vertical, transverse component and vector sum of peak particle velocity are measured at a distance from the impact position. In addition, reduction method of ground vibration by open trench are discussed and the amplitude reduction factor of three components are calculated.