Resources Recycling (자원리싸이클링)

The Korean Institute of Resources Recycling (한국자원리싸이클링학회)
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Separation Behavior of Vanadium and Tungsten from the Spent SCR DeNOX Catalyst by Strong Basic Anion Exchange Resin

SCR 탈질 폐촉매로부터 강염기성 음이온교환수지를 이용한 바나듐/텅스텐 분리거동 고찰

  • Heo, Seo-Jin (Department of Chemical Engineering, Kwangwoon University) ;
  • Jeon, Jong-Hyuk (Convergence Research Center for Development of Mineral Resources, Korea Institute of Geoscience & Mineral Resources) ;
  • Kim, Chul-Joo (Mineral Resources Research Division, Korea Institute of Geoscience & Mineral Resources) ;
  • Chung, Kueong-Woo (Mineral Resources Research Division, Korea Institute of Geoscience & Mineral Resources) ;
  • Jeon, Ho-Seok (Mineral Resources Research Division, Korea Institute of Geoscience & Mineral Resources) ;
  • Yoon, Do-Young (Department of Chemical Engineering, Kwangwoon University) ;
  • Yoon, Ho-Sung (Mineral Resources Research Division, Korea Institute of Geoscience & Mineral Resources)
  • 허서진 (광운대학교 화학공학과) ;
  • 전종혁 (한국지질자원연구원 DMR 융합연구단) ;
  • 김철주 (한국지질자원연구원 광물자원본부) ;
  • 정경우 (한국지질자원연구원 광물자원본부) ;
  • 전호석 (한국지질자원연구원 광물자원본부) ;
  • 윤도영 (광운대학교 화학공학과) ;
  • 윤호성 (한국지질자원연구원 광물자원본부)
  • Received : 2020.08.13
  • Accepted : 2020.09.14
  • Published : 2020.10.30
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Abstract

In this study, factors affecting the adsorption reaction for the separation/recovery of V and W using Lewatit monoplus MP 600, a strong basic anion exchange resin, from the leachate obtained through the soda roasting-water leaching process from the spent SCR DeNOX catalyst investigated and the adsorption mechanism was discussed based on the results. In the case of the mixed solution of V and W, both ions showed a high adsorption ratio at pH 2-6, but the adsorption of W was greatly reduced at pH 8. In the adsorption isothermal experiment, both V and W were fitted well at the Langmuir adsorption isotherm, and the reaction kinetics were fitted well at pseudo-second-order. As a result of conducting an adsorption experiment by adjusting the pH with H2SO4 to remove Si, which inhibits the adsorption of V and W from the leachate, the lowest W adsorption ratio was shown at pH 8.5. Desorption of W was hardly achieved in strongly acidic solutions, and desorption of V was well performed in both strongly acidic and strongly basic solutions.

본 연구에서는 SCR 탈질 폐촉매의 소다배소-수침출 공정을 통해 얻은 침출액으로부터 강염기성 음이온교환수지인 Lewatit monoplus MP 600을 사용하여, V과 W의 분리/회수를 위한 흡착반응에 영향을 미치는 인자들에 대하여 알아보고, 이를 통하여 흡착 메커니즘을 조사하였다. V과 W 혼합용액의 경우 pH 2-6에서는 두 이온 모두 높은 흡착률을 보였지만, pH 8에서 W의 흡착은 크게 저하되었다. 흡착등온실험에서 V과 W 모두 Langmuir 흡착등온식에 적합하였고, 반응속도론적 고찰 결과 pseudo-second-order에 적합하였다. 침출액에서 V과 W의 흡착을 저해하는 Si를 제거하기 위하여 H2SO4로 pH를 조절하여 흡착실험을 수행한 결과, pH 8.5에서 가장 낮은 W 흡착률을 보였다. W의 탈착은 강산성 용액에서 거의 이루어지지 않았으며 V은 강산성 용액과 강염기성 용액 모두에서 탈착이 잘 이루어졌다.

Keywords

References

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  1. SCR 탈질 폐촉매로부터 이온교환칼럼을 이용한 바나듐과 텅스텐의 분리 vol.30, pp.4, 2020, https://doi.org/10.7844/kirr.2021.30.4.54