The Separation of Vanadium and Tungsten from Spent Selective Catalytic Reduction Catalyst Leach Solution by Alamine 336

Seongsu Kang; Gyeonghye Moon; In-Hyeok Choi; Dakyeong Baek; Kyoungkeun Yoo

doi:10.7844/kirr.2024.33.3.30

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2024 Vol.33, Issue 3 Preview Page Next Page

Research Paper

The Separation of Vanadium and Tungsten from Spent Selective Catalytic Reduction Catalyst Leach Solution by Alamine 336 탈질 폐촉매 침출액으로부터 Alamine 336에 의한 바나듐과 텅스텐의 분리

30 June 2024. pp. 30-37

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Abstract

In this study, we investigated the separability of vanadium and tungsten from spent SCR (Selective Catalytic Reduction) catalyst leach solution by reduction of vanadium and solvent extraction using Alamine 336 and conducted experiments to optimize process conditions. It is difficult to separate vanadium and tungsten due to their similar chemical behavior, but tungsten can be selectively extracted from acidic solution when vanadium extraction is prevented by reducing anionic pentavalent vanadium to cationic tetravalent vanadium. The results showed that NaHSO₃ was most suitable as a reducing agent, and the extraction efficiency of vanadium decreased and the separation efficiency increased as the amount of reducing agent added, reaction time, and temperature increased. When reducing NaHSO₃ 1.5 eq, 60 min, and 60℃, which are optimal conditions of reduction, vanadium and tungsten were effectively separated with vanadium extraction efficiency of 5.8%, tungsten extraction efficiency of 99%, and separation factor of vanadium and tungsten of 7,564.

Keywords

Spent SCR catalyst

Tungsten

Vanadium

Alamine 336

Reduction

본 연구에서는 탈질 폐촉매 침출액으로부터 바나듐 환원과 Alamine 336을 이용한 용매추출에 의해 바나듐과 텅스텐의 분리 가능성을 조사하고 최적 공정 조건을 도출하기 위한 실험을 수행하였다. 바나듐과 텅스텐은 화학적 거동이 비슷하여 분리가 어렵지만 산성용액에서 일부 존재하는 음이온 상태의 5가 바나듐을 양이온 상태의 4가 바나듐으로 환원시켜 음이온 교환 추출제에 의한 추출을 억제할 경우 텅스텐을 선택적으로 추출할 수 있다. 실험 결과, 환원제로 NaHSO₃가 가장 적합하였으며 환원제 첨가량, 반응 시간, 온도가 증가할수록 바나듐의 추출 효율이 감소하여 분리 효율이 증가하였다. 최적 환원 조건인 NaHSO₃ 1.5당량, 60분, 60℃ 조건에서 환원할 경우, 바나듐 추출 효율 5.8%, 텅스텐 추출 효율 99%, 바나듐과 텅스텐의 분리 계수 7,564로 두 성분이 효과적으로 분리되었다.

키워드

탈질 폐촉매

바나듐

텅스텐

Alamine 336

환원

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Information

Publisher :The Korean Institute of Resources Recycling
Publisher(Ko) :한국자원리싸이클링학회
Journal Title :Resources Recycling
Journal Title(Ko) :자원리싸이클링
Volume : 33
No :3
Pages :30-37
Received Date : 2024-05-16
Revised Date : 2024-06-05
Accepted Date : 2024-06-07
DOI :https://doi.org/10.7844/kirr.2024.33.3.30

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

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