Study on the Manufacture of High-purity Vanadium Pentoxide for VRFB Using Chelating Agents

Sun Kyung Kim; Sukcheol Kwon; Hee Seo Kim; Yong Jae Suh; Jeong Hyun Yoo; Hankwon Chang; Ho-Seok Jeon; In-Su Park

doi:10.7844/kirr.2022.31.2.20

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2022 Vol.31, Issue 2 Preview Page Next Page

Study on the Manufacture of High-purity Vanadium Pentoxide for VRFB Using Chelating Agents 킬레이트제를 활용한 VRFB용 고순도 오산화바나듐 제조 연구

30 April 2022. pp. 20-32

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Abstract

This study implemented a chelating agent (Ethylenediaminetetraacetic acid, EDTA) in purification to obtain high-purity vanadium pentoxide (V₂O₅) for use in VRFB (Vanadium Redox Flow Battery). V₂O₅ (powder) was produced through the precipitation recovery of ammonium metavanadate (NH₄VO₃) from a vanadium solution, which was prepared using a low-purity vanadium raw material. The initial purity of the powder was estimated to be 99.7%. However, the use of a chelating agent improved its purity up to 99.9% or higher. It was conjectured that the added chelating agent reacted with the impurity ions to form a complex, stabilizing them. This improved the selectivity for vanadium in the recovery process. However, the prepared V₂O₅ powder exhibited higher contents of K, Mn, Fe, Na, and Al than those in the standard counterparts, thus necessitating additional research on its impurity separation. Furthermore, the vanadium electrolyte was prepared using the high-purity V₂O₅ powder in a newly developed direct electrolytic process. Its analytical properties were compared with those of commercial electrolytes. Owing to the high concentration of the K, Ca, Na, Al, Mg, and Si impurities in the produced vanadium electrolyte, the purity was analyzed to be 99.97%, lower than those (99.98%) of its commercial counterparts. Thus, further research on optimizing the high-purity V₂O₅ powder and electrolyte manufacturing processes may yield a process capable of commercialization.

Keywords

VRFB

Vanadium electrolyte

Vanadium pentoxide

Chelating agent

Impurity separation purification

본 연구에서는 VRFB용 고순도 오산화바나듐을 제조하기 위한 불순물 분리 정제 공정에서 킬레이트제(EDTA)의 영향을 조사하였다. 저순도 바나듐 원료를 이용하여 제조된 바나듐 용액으로부터 NH₄VO₃ 을 침전 회수하여 제조된 최종 V₂O₅ 분말의 순도는 99.7%로 분석되었지만 NH₄VO₃ 침전 회수 공정에서 킬레이트제를 첨가한 경우 최종 V₂O₅ 분말 순도가 99.9% 이상으로 향상되었다. 이러한 결과는 첨가된 킬레이트제가 불순물 이온과 반응하여 complex를 형성하고 불순물 이온이 안정화되기 때문에 침전 회수 공정에서 바나듐에 대한 선택성이 향상된 것으로 판단된다. 하지만 제조된 V₂O₅ 분말내에는 불순물 규격 대비 K, Mn, Fe, Na 및 Al 함유량이 높아 추가적인 불순물 정제 연구가 필요하였다. 고순도 V₂O₅ 분말을 새롭게 개발된 직접 전해공정에 적용하여 바나듐 전해액을 제조하였고 이의 특성을 상용 전해액과 비교 분석하였다. 제조된 바나듐 전해액의 순도는 불순물 K, Ca, Na, Al, Mg 및 Si 성분의 높은 함량으로 인하여 상용 전해액의 순도 99.98%보다 낮은 99.97%로 분석되었다. 따라서 고순도 V₂O₅ 분말 및 전해액 제조 공정의 불순물 분리 정제에 대한 추가적인 최적화 연구가 수행된다면 상용화가 가능한 공정이 개발될 것으로 기대된다.

키워드

바나듐 레독스 흐름 전지

바나듐 전해액

오산화바나듐

킬레이트제

불순물 분리 정제

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Information

Publisher :The Korean Institute of Resources Recycling
Publisher(Ko) :한국자원리싸이클링학회
Journal Title :Resources Recycling
Journal Title(Ko) :자원리싸이클링
Volume : 31
No :2
Pages :20-32
Received Date : 2022-01-25
Revised Date : 2022-02-18
Accepted Date : 2022-02-21
DOI :https://doi.org/10.7844/kirr.2022.31.2.20

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

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