Hydrometallurgical processing of spent selective catalytic reduction (SCR) catalyst for recovery of tungsten

Choi, In-Hyeok; Moon, Gyeonghye; Lee, Jin Young; Jyothi, Rajesh Kumar

doi:10.1016/j.hydromet.2018.04.011

Cited by 41 publications

(14 citation statements)

References 22 publications

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“…3 (b), the leaching time does not contribute signi cantly to the leaching e ciency for vanadium and tungsten. Several researchers have studied the ideal conditions for roasting and leaching of spent SCR catalyst, however time leaching time has always been long (at least 1h) to maximize the leaching of vanadium and tungsten 19,20,23,24 . For instance, Moon et al obtained an almost complete leaching of vanadium and tungsten in a 1h interval 25 .…”

Section: Resultsmentioning

confidence: 99%

Novel Eco-friendly Roasting and Leaching Process Development to Recycle Valuable Metals from Spent SCR deNOX Catalyst

Jeon

Sola

Lee

et al. 2021

Preprint

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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 with 40% NaOH solution for 2h at 973K and DI water leaching for 30minutes, at 298K 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 with the objective to recover vanadium and tungsten. Silicon compounds are one of the main impurities leached alongside the valuable metals and in this work, the silicon compounds leached are reduced significantly 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 in a shorter time regardless of the leaching temperature.

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Section: Resultsmentioning

confidence: 99%

Novel Eco-friendly Roasting and Leaching Process Development to Recycle Valuable Metals from Spent SCR deNOX Catalyst

Jeon

Sola

Lee

et al. 2021

Preprint

Self Cite

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“…As shown in Figure , the spent lithium ion batteries (LIBs) contain the valuable metals of Cu, Zn, Pb, and Sn as well as the precious metals of Pt and Ag; thus efficient and selective recovery is highly desirable rather than simple landfilling. A similar phenomenon can also be found in spent selective catalytic reduction (SCR) catalysts, stemming from the 5 × 10 5 t scrapped V 2 O 5 –WO 3 /TiO 2 catalysts in fossil fuel combustion plants every year . It has been demonstrated that a specific recovery method should be carried out depending on the complicated features of the target solid waste (i.e., composition, phases, and origins of different metals), in which the metals are usually presented as refractory oxide/hydroxide and alloys.…”

Section: Current Status Of Metal Recoverymentioning

confidence: 99%

Sustainable Electrochemical Extraction of Metal Resources from Waste Streams: From Removal to Recovery

Jin

Zhang

2020

ACS Sustainable Chem. Eng.

117

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Due to the widespread application of heavy metals in steel making, electronics, batteries, leather tanning, and catalysis, considerable toxic heavy metal-bearing wastewater and solid waste are directly or indirectly discharged into surrounding environments. Recently, electrochemical methods have attracted considerable attention for the remediation of metal pollution, originating from their environmental compatibility, high efficiency/selectivity/feasibility, and cost effectiveness. This review aims at recent advances in electrochemical metal recovery techniques, such as electrodeposition, electrosorption, electrodialysis, electrodeionization, and bioelectrochemical and photoelectrochemical methods. Additionally, the mechanisms and behaviors of different strategies are reviewed and compared, to overcome the limitations of concentration polarization from dilute metal ions, production of dendrites and spongy deposits, sluggish kinetics of ions transportation, and side-reactions from the hydrogen evolution and oxygen reduction reactions. Furthermore, the current challenges and future prospects of electrochemical metal recovery applications are also provided, to establish a process–mechanism–products (PMP) rational design of metal recovery, rather than simple metal removal.

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“…During a previous study conducted in our research laboratory, the selective leaching of titanium was conducted, while leaving a soda roasted liquor containing approximately 7000mg/L of tungsten and 600mg/L of vanadium, which cannot be easily separated due to their similar chemical and physical properties 9,[12][13][14] .…”

Section: Introductionmentioning

confidence: 99%

Spent SCR Catalyst Leach Liquor Processed for Valuable Metals Extraction by Solvent Extraction Technique#

Sola

Jeon²,

Lee³

et al. 2020

J. of Korean Inst. of Resources Recycling

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Selective catalytic reduction (SCR) has been a promising technology to reduce the air pollution caused by nitrogen oxides (NOx) in several industries. The consumption of SCR catalysts increases every year as technology evolves, however those have a limited lifespan and usually end up in landfills after they deactivate. Currently, the most widely used catalyst for and stationary applications is V 2 O 5 -WO 3 /TiO 2 which can contain around 50% wt V 2 O 5 and 7-10% wt of WO 3 . The vast uses for both vanadium 56

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Hydrometallurgical processing of spent selective catalytic reduction (SCR) catalyst for recovery of tungsten

Cited by 41 publications

References 22 publications

Novel Eco-friendly Roasting and Leaching Process Development to Recycle Valuable Metals from Spent SCR deNOX Catalyst

Novel Eco-friendly Roasting and Leaching Process Development to Recycle Valuable Metals from Spent SCR deNOX Catalyst

Sustainable Electrochemical Extraction of Metal Resources from Waste Streams: From Removal to Recovery

Spent SCR Catalyst Leach Liquor Processed for Valuable Metals Extraction by Solvent Extraction Technique#

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