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최인혁,문경혜,전종혁,이진영,라제쉬 쿠마 죠티,Choi, In-Hyeok,Moon, Gyeonghye,Jeon, Jong-Hyuk,Lee, Jin-Young,Jyothi, Rajesh Kumar The Korean Institute of Resources Recycling 2020 資源 리싸이클링 Vol.29 No.2
In new millennium, wide-reaching demands for selective catalytic reduction (SCR) catalyst have been increased gradually in new millennium. SCR catalyst can prevent the NO<sub>x</sub> emission to protect the environment. In SCR catalyst the main composition of the catalyst is typically TiO<sub>2</sub> (70~80%), WO<sub>3</sub> (7~10%), V<sub>2</sub>O<sub>5</sub> (~1%) and others. When the SCR catalysts are used up and disposed to landfills, it is problematic that those should exist in the landfill site permanently due to their extremely low degradability. A new advanced technology needs to be developed primarily to protect environment and then recover the valuable metals. Hydrometallurgical techniques such as leaching and liquid-liquid extraction was designed and developed for the spent SCR catalyst processing. In a first stage, V and W selectively leached from spent SCR catalyst, then both the metals were processed by liquid-liquid extraction process. Various commercial extractants such as D2EHPA, PC 88A, TBP, Cyanex 272, Aliquat 336 were tested for selective extraction of title metals. Scrubbing and stripping studies were tested and optimized for vanadium and tungsten extraction and possible separation. 3<sup>rd</sup> phase studies were optimized by using iso-decanol reagent.
전종혁,이진영,김준수,윤호성,라제쉬 쿠마 죠티,Jeon, Jong-Hyuk,Lee, Jin-Young,Kim, Joon Soo,Yoon, Ho-Sung,Jyothi, Rajesh Kumar The Korean Institute of Resources Recycling 2021 資源 리싸이클링 Vol.30 No.4
원자력 발전 프로그램에 의해 세계 우라늄 메탈의 수요가 증가함에 따라 우라늄 메탈의 중요도는 날로 증가하고 있다. 이러한 우라늄 수요의 높은 증가로 인해 주로 바나듐을 비롯한 다른 원소들로부터 우라늄을 회수하고자 하는 새로운 추출법들이 더욱 중요하게 되었다. 본 연구에서는 kerosene에 희석된 상업용 아민 기반 추출제를 사용하여 황산 용액에서 우라늄(VI)과 바나듐(V)을 분리하는 방법을 다루었다. 0.005 ~ 5.0 mol/L농도의 황산 용액과 0.005 ~ 0.2 mol/L농도의 추출제를 사용하였다. 모든 실험은 25℃에서 30분동안 동일한 수상과 유기상의 비율(A:O = 1:1)로 수행하였다. 실험 결과 값으로부터 계산된 분리 계수(SF's)를 제시하고 모든 실험 값과 비교하였다.
Solvent Extraction of the Thorium from Monazite Leaching Solution by Primene-JM-T
전종혁,김홍인,이진영,죠티 라제쉬 쿠마,Jeon, Jong-Hyuk,Kim, Hong-In,Lee, Jin-Young,Jyothi, Rajesh Kumar The Korean Institute of Resources Recycling 2021 資源 리싸이클링 Vol.30 No.5
본 연구는 모나자이트 침출액으로부터 용매추출을 통한 토륨의 추출 및 분리 가능성에 대해 연구하였다. 토륨 용매추출 공정을 위해 1차 아민계 추출제인 Primene-JM-T가 선택되었다. 토륨의 액-액 추출 공정을 위해 다양한 조건의 실험이 수행되고 조건이 확립되었다. 연구 결과로부터 추출제 검증, pH 조건, 추출제의 변화 및 추출 등온선의 작성 및 최종적으로 추출제로부터의 탈거 조건을 확립하였다.
아나 벨렌 쿠에바 솔라,전종혁,이진영,판카즈 쿠마 파리,라제쉬 쿠마 죠티,Sola, Ana Belen Cueva,Jeon, Jong-Hyuk,Lee, Jin-Young,Parhi, Pankaj Kumar,Jyothi, Rajesh Kumar The Korean Institute of Resources Recycling 2020 資源 리싸이클링 Vol.29 No.2
Selective catalytic reduction (SCR) has been a promising technology to reduce the air pollution caused by nitrogen oxides (NOx) in several industries. The consumption of SCR catalysts increases every year as technology evolves, however those have a limited lifespan and usually end up in landfills after they deactivate. Currently, the most widely used catalyst for and stationary applications is V<sub>2</sub>O<sub>5</sub>-WO<sub>3</sub>/TiO<sub>2</sub> which can contain around 50% wt V<sub>2</sub>O<sub>5</sub> and 7-10% wt of WO<sub>3</sub>. The vast uses for both vanadium and tungsten and the worldwide interest in recycling methods that allow for the extraction of metals from secondary sources represent the major motivation for this research. The extraction time, pH dependency, extraction concentration studies were carried out using Aliquat 336 in exxol D80 as the extractant. It was determined that to optimize the extraction of both metals 30min of contact time with an organic phase containing 0.5mol/L of Aliquat 336 are needed at a slightly acidic pH (~5.0). In addition, counter McCabe-Thiele studies allowed us to determine that one stage is necessary for the removal of 99% of vanadium while 2 stages are necessary for the extraction of tungsten and counter current simulations proved that the theoretical approach was correct.