Resources Recycling (자원리싸이클링)

The Korean Institute of Resources Recycling (한국자원리싸이클링학회)
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Spent SCR Catalyst Leach Liquor Processed for Valuable Metals Extraction by Solvent Extraction Technique

SCR 폐촉매 침출액으로부터 용매추출법에 의한 유가금속의 추출

  • Sola, Ana Belen Cueva (Convergence Research Center for Development of Mineral Resources (DMR), Korea Institute of Geoscience and Mineral Resources (KIGAM)) ;
  • Jeon, Jong-Hyuk (Convergence Research Center for Development of Mineral Resources (DMR), Korea Institute of Geoscience and Mineral Resources (KIGAM)) ;
  • Lee, Jin-Young (Convergence Research Center for Development of Mineral Resources (DMR), Korea Institute of Geoscience and Mineral Resources (KIGAM)) ;
  • Parhi, Pankaj Kumar (Convergence Research Center for Development of Mineral Resources (DMR), Korea Institute of Geoscience and Mineral Resources (KIGAM)) ;
  • Jyothi, Rajesh Kumar (Convergence Research Center for Development of Mineral Resources (DMR), Korea Institute of Geoscience and Mineral Resources (KIGAM))
  • Received : 2019.11.12
  • Accepted : 2020.02.17
  • Published : 2020.04.30
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Abstract

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 V2O5-WO3/TiO2 which can contain around 50% wt V2O5 and 7-10% wt of WO3. 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.

선택적 촉매 환원법(SCR)은 여러 산업에서 질소산화물 (NOx)에 의한 대기오염을 줄일 수 있는 매우 유망한 기술이다. SCR 촉매의 소비는 기술이 발전함에 따라 매년 증가하고 있지만, 촉매의 수명은 제한되어 있으며, 일반적으로 수명이 다해 활성이 떨어진 폐촉매는 재활용 되지 않고 매립되어 처리되고 있다. 현재 가장 널리 사용되는 촉매는 V2O5-WO3/TiO2로 구성되어 있으며, 약 5%wt의 V2O5와 7-10%wt의 WO3를 함유하고 있다. 본 연구는 2차 공급원으로부터 유용 금속을 회수할 수 있는 기술개발에 대한 전세계적인 관심과, 다양한 분야에서의 바나듐 및 텅스텐의 수요에 대한 안정적인 공급을 대비하기 위한 기술개발을 바탕으로 한다. 추출 시간, pH 의존도 및 추출 농도에 대한 연구는 희석제 exxol D80에 추출제로 Aliquat 336을 사용하여 수행되었다. 두 금속의 최적 추출을 위한 조건은 약산성(~5.0) 영역에서 0.5mol/L의 Aliquat 336을 함유한 유기상과 30분 동안 추출 반응을 수행해야 하는 것으로 확인되었다. 또한 counter-McCabe-Thiele 분석으로부터 99%의 바나듐을 제거하기 위해 1단의 단수가 필요하고, 텅스텐의 추출을 위해 2단의 단수가 필요하였으며, 향류추출공정(counter-current simulations) 방식을 통한 이론적 접근의 적합성을 증명하였다.

Keywords

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