Separation Behavior of Vanadium and Tungsten from the Spent SCR DeNOX Catalyst by Strong Basic Anion Exchange Resin

Seo-Jin Heo; Jong-Hyuk Jeon; Chul-Joo Kim; Kueong-Woo Chung; Ho-Seok Jeon; Do-Young Yoon; Ho-Sung Yoon

doi:10.7844/kirr.2020.29.5.38

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2020 Vol.29, Issue 5 Preview Page Next Page

Research Paper

Separation Behavior of Vanadium and Tungsten from the Spent SCR DeNO_X Catalyst by Strong Basic Anion Exchange Resin SCR 탈질 폐촉매로부터 강염기성 음이온교환수지를 이용한 바나듐/텅스텐 분리거동 고찰

31 October 2020. pp. 38-47

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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 DeNO_X 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.

Keywords

Spent SCR DeNO_X catalyst

Anion exchange resin

Adsorption

Vanadium

Tungsten

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.

키워드

SCR 탈질 폐촉매

음이온교환수지

흡착

바나듐

텅스텐

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Information

Publisher :The Korean Institute of Resources Recycling
Publisher(Ko) :한국자원리싸이클링학회
Journal Title :Journal of the Korean Institute of Resources Recycling
Journal Title(Ko) :자원리싸이클링
Volume : 29
No :5
Pages :38-47
Received Date : 2019-08-13
Revised Date : 2019-09-07
Accepted Date : 2019-09-14
DOI :https://doi.org/10.7844/kirr.2020.29.5.38

Resources Recycling ISSN:2765-3439(Print) 2765-3447(Online) 자원리싸이클링

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