Hydrometallurgical process development to recycle valuable metals from spent SCR deNOX catalyst

Abstract Spent catalyst, containing vanadium and tungsten oxide in a TiO2 glass fiber matrix, pose a risk of environmental contamination due to the high toxicity of its metal oxides if leached into the soil when disposed in landfills. Due to the increasing demand of metals and the continuous depleti...

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Autores principales:	Jong Hyuk Jeon, Ana Belen Cueva Sola, Jin-Young Lee, Rajesh Kumar Jyothi
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/932ed2ab15ea41eca4fe9ec4a4b4906d
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spelling	oai:doaj.org-article:932ed2ab15ea41eca4fe9ec4a4b4906d2021-11-14T12:21:02ZHydrometallurgical process development to recycle valuable metals from spent SCR deNOX catalyst10.1038/s41598-021-01726-02045-2322https://doaj.org/article/932ed2ab15ea41eca4fe9ec4a4b4906d2021-11-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-01726-0https://doaj.org/toc/2045-2322Abstract Spent catalyst, containing vanadium and tungsten oxide in a TiO2 glass fiber matrix, pose a risk of environmental contamination due to the high toxicity of its metal oxides if leached into the soil when disposed in landfills. Due to the increasing demand of metals and the continuous depletion of primary resources there is an growing necessity for recycling and reprocessing of spent catalysts and other secondary metal sources for environmental and economical reasons. Study of spent SCR catalyst soda roasting process with dissolved NaOH compared with the usual NaOH dry roasting and its influence in the subsequent water leaching. After optimization, the ideal parameters are roasting using a 0.4 ratio of NaOH/spent SCR catalyst in solution for 2 h at 973 K and de-ionized water leaching for 30 min, at 298 K with a pulp density of 30%. The research results show an important reduction of the roasting temperature and leaching time during the processing of spent SCR catalyst obtaining a 95.4% W and 80.2% V leaching efficiency liquor. Silicon compounds are one of the main impurities leached alongside the valuable metals and in this work, the silicon compounds leached are reduced significantly with the aim of avoiding the de-silication post-processing of the leach liquor. The main advantage of the proposed process is the increase of the leaching efficiency of vanadium and tungsten with a minimization of silicon impurities in a shorter time regardless of the leaching temperature.Jong Hyuk JeonAna Belen Cueva SolaJin-Young LeeRajesh Kumar JyothiNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-12 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Jong Hyuk Jeon Ana Belen Cueva Sola Jin-Young Lee Rajesh Kumar Jyothi Hydrometallurgical process development to recycle valuable metals from spent SCR deNOX catalyst
description	Abstract Spent catalyst, containing vanadium and tungsten oxide in a TiO2 glass fiber matrix, pose a risk of environmental contamination due to the high toxicity of its metal oxides if leached into the soil when disposed in landfills. Due to the increasing demand of metals and the continuous depletion of primary resources there is an growing necessity for recycling and reprocessing of spent catalysts and other secondary metal sources for environmental and economical reasons. Study of spent SCR catalyst soda roasting process with dissolved NaOH compared with the usual NaOH dry roasting and its influence in the subsequent water leaching. After optimization, the ideal parameters are roasting using a 0.4 ratio of NaOH/spent SCR catalyst in solution for 2 h at 973 K and de-ionized water leaching for 30 min, at 298 K with a pulp density of 30%. The research results show an important reduction of the roasting temperature and leaching time during the processing of spent SCR catalyst obtaining a 95.4% W and 80.2% V leaching efficiency liquor. Silicon compounds are one of the main impurities leached alongside the valuable metals and in this work, the silicon compounds leached are reduced significantly with the aim of avoiding the de-silication post-processing of the leach liquor. The main advantage of the proposed process is the increase of the leaching efficiency of vanadium and tungsten with a minimization of silicon impurities in a shorter time regardless of the leaching temperature.
format	article
author	Jong Hyuk Jeon Ana Belen Cueva Sola Jin-Young Lee Rajesh Kumar Jyothi
author_facet	Jong Hyuk Jeon Ana Belen Cueva Sola Jin-Young Lee Rajesh Kumar Jyothi
author_sort	Jong Hyuk Jeon
title	Hydrometallurgical process development to recycle valuable metals from spent SCR deNOX catalyst
title_short	Hydrometallurgical process development to recycle valuable metals from spent SCR deNOX catalyst
title_full	Hydrometallurgical process development to recycle valuable metals from spent SCR deNOX catalyst
title_fullStr	Hydrometallurgical process development to recycle valuable metals from spent SCR deNOX catalyst
title_full_unstemmed	Hydrometallurgical process development to recycle valuable metals from spent SCR deNOX catalyst
title_sort	hydrometallurgical process development to recycle valuable metals from spent scr denox catalyst
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/932ed2ab15ea41eca4fe9ec4a4b4906d
work_keys_str_mv	AT jonghyukjeon hydrometallurgicalprocessdevelopmenttorecyclevaluablemetalsfromspentscrdenoxcatalyst AT anabelencuevasola hydrometallurgicalprocessdevelopmenttorecyclevaluablemetalsfromspentscrdenoxcatalyst AT jinyounglee hydrometallurgicalprocessdevelopmenttorecyclevaluablemetalsfromspentscrdenoxcatalyst AT rajeshkumarjyothi hydrometallurgicalprocessdevelopmenttorecyclevaluablemetalsfromspentscrdenoxcatalyst
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Hydrometallurgical process development to recycle valuable metals from spent SCR deNOX catalyst

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