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SCR 탈질 폐촉매로부터 이온교환칼럼을 이용한 바나듐과 텅스텐의 분리
허서진,전종혁,김리나,김철주,정경우,전호석,윤호성,Heo, Seo-Jin,Jeon, Jong-Hyuk,Kim, Rina,Kim, Chul-Joo,Chung, Kyeong Woo,Jeon, Ho-Seok,Yoon, Ho-Sung 한국자원리싸이클링학회 2021 資源 리싸이클링 Vol.30 No.4
Vanadium and tungsten can be obtained by separating/recovering the leaching solution from a spent SCR DeNO<sub>X</sub> catalyst using the soda roasting-water leaching process. Therefore, in this study, the adsorption/desorption mechanism of vanadium and tungsten in an ion-exchange column was investigated using Lewatit MonoPlus MP 600, a strong basic anion exchange resin. The operating conditions for the separation of vanadium and tungsten in the ion-exchange column was intended to present. By conducting a continuous adsorption experiment in a pH 8.5 solution, the adsorption capacity of vanadium and tungsten was found to be 44.75 and 64.92 mg/(g of resin), respectively, which showed that the adsorption capacity of tungsten was larger than that of vanadium because of the difference in ion charge. Vanadium has a higher affinity for MP 600 than tungsten. Consequently, as the vanadium-containing solution is eluted through the ion exchange resin onto which tungsten is adsorbed, the adsorbed tungsten is exchanged with vanadium and desorbed. A continuous experiment was performed with a solution of vanadium and tungsten prepared at the same concentration as the spent SCR DeNO<sub>X</sub> catalyst leachate. The adsorption capacity of vanadium was found to be 48.72 mg/(g of resin) and 80% of the supplied vanadium was adsorbed; in contrast, almost no tungsten was adsorbed. Therefore, vanadium and tungsten were separated effectively. The ion exchange resin was treated with 2 M HCl at 15 mL/h, and 97.7% of the vanadium(99% purity) could be desorbed. After desorption, NH<sub>4</sub>Cl was added to precipitate ammonium polyvanadate at 90℃ and recover 93% of the vanadium.
조관 및 시편 가공 영향을 고려한 강관의 균일 물성 평가기술 개발
허서진 ( Heo¸ Seo-jin ),김동원 ( Kim¸ Dong-won ),강수창 ( Kang¸ Soo-chang ),김진국 ( Kim¸ Jin-kook ) 한국구조물진단유지관리공학회 2023 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.27 No.2
이 연구는 조관 후 원형 강관에서 시편을 채취하는 과정 절단기 등에 의한 열 영향, 편평화 방법, 두께-직경 비(1/D)를 변수로 인장시험 및 유한요소해석을 수행함으로써 시편 채취 및 가공 과정 각 물성 변화 인자의 영향 분석을 기반으로 강관의 균일화된 물성 확보를 위한 시험 및 평가법 제안을 목표로 한다. 향후 소재, 강관, 강관에서 채취한 시편의 단계별 물성의 상관관계를 분석함으로써 원형 강관의 제작과정 및 시험조건을 고려한 강관의 구조성능 예측 모델을 개발하고자 한다.
강성묵(Kang, Seong Muk),허서진(Heo, Seo Jin),김진국(Kim, Jin-Kook) 한국콘크리트학회 2021 한국콘크리트학회 학술대회 논문집 Vol.33 No.2
이 연구에서는 RWS 터널 화재시나리오에 근거하여 유한요소 해석프로그램인 ABAQUS의 열전달 해석을 통한 난연 FRP패널의 두께에 따른 RC 슬래브의 내화성능을 평가하였다. 얇은 두께에서 내화성능 확보를 위해 열전도율이 낮은 공기층을 포함하여 해석을 진행하였다. 이를 활용하여 RC 슬래브의 내화성능 확보가 가능하도록 하는 적절한 난연 FRP패널과 공기층의 두께를 산출하였다. In this study, the fire resistance performance of RC slabs according to the thickness of flame retardant FRP panels was evaluated through the heat transfer analysis of ABAQUS, a finite element analysis program, based on RWS fire curves by investigating tunnel structure. In order to secure fire resistance performance at a thin thickness, the analysis was conducted including an air layer with low thermal conductivity. Using this, the thickness of the appropriate flame retardant FRP panel and air layer to ensure the fire resistance performance of the RC slab was calculated.