Recovery of niobium and tantalum by solvent extraction from Sn–Ta–Nb mining tailings

Rodríguez, Olga; Alguacil, Francisco José; Baquero, Esther Escudero; García‐Díaz, Irene; Fernández, Paloma; Sotillo, Belén; López, Félix A.

doi:10.1039/d0ra03331f

Cited by 33 publications

(30 citation statements)

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“…The recovery of the Ta-compounds from the tailings have been previously reported [ 5 ]. As a summary of the process, Penouta mining tailings (cassiterite and columbotantalite) were treated by a pyrometallurgical process to obtain a metal tin ingot and a slag [ 4 ].…”

Section: Methodsmentioning

confidence: 99%

“…Figure 2 a shows schematically the steps of the synthesis process. Further information about the recovery of this material can be found in Rodríguez et al [ 5 ].…”

Section: Methodsmentioning

confidence: 99%

“…to obtain tin has recently been unveiled as a promising source for other minerals, in particular coulombotantalite [ 4 ]. Our team is working in the recovery of tantalum and niobium from the mining tailings, in order to reintroduce these precious raw materials into the technological life cycle [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

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Characterization of K6Ta10.8O30 Microrods with Tetragonal Tungsten Bronze-Like Structure Obtained from Tailings from the Penouta Sn-Ta-Nb Deposit

et al. 2020

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In this work, a deep characterization of the properties of K6Ta10.8O30 microrods has been performed. The starting material used to grow the microrods has been recovered from mining tailings coming from the Penouta Sn-Ta-Nb deposit, located in the north of Spain. The recovered material has been submitted to a thermal treatment to grow the microrods. Then, they have been characterized by scanning electron microscopy, X-ray diffraction, micro-Raman and micro-photoluminescence. The results of our study confirm that the K6Ta10.8O30 microrods have a tetragonal tungsten bronze-like crystal structure, which can be useful for ion-batteries and photocatalysis.

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Section: Methodsmentioning

confidence: 99%

“…Figure 2 a shows schematically the steps of the synthesis process. Further information about the recovery of this material can be found in Rodríguez et al [ 5 ].…”

Section: Methodsmentioning

confidence: 99%

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Characterization of K6Ta10.8O30 Microrods with Tetragonal Tungsten Bronze-Like Structure Obtained from Tailings from the Penouta Sn-Ta-Nb Deposit

et al. 2020

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“…Yet, it has been proven that mine tailings from existing or abandoned mines could become a valuable source of essential minerals. This is the case, for instance, of the old Zinc Penouta mine in Spain, which tailings are now a source of niobium and tantalum (Rodríguez et al, 2020) Recycling end-of-life products still face many challenges that prevent it from being a significant source of raw materials. Barriers include competition from primary supply, information deficits and limited waste collection.…”

Section: Is Recycling the Solution?mentioning

confidence: 99%

Resumen y análisis crítico del informe especial de la Agencia Internacional de la Energía: El Rol de los minerales críticos en la transición hacia energías limpias

Valero

Calvo

2021

revmetal

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Este artículo hace una revisión crítica del informe de la AIE titulado El rol de los minerales críticos en la transición hacia energías limpias. El objetivo principal de este informe es identificar los minerales y metales clave que podrían generar problemas de suministro y cuellos de botella en una transición energética limpia. La AIE establece una serie de recomendaciones clave para la seguridad de los minerales, analizando la cantidad de diferentes materiales utilizados en determinadas tecnologías (coches eléctricos, energía solar fotovoltaica, eólica terrestre y marina, nuclear, carbón y gas natural). Dichas recomendaciones incluyen, entre otras, garantizar una inversión adecuada en fuentes diversificadas de nuevo suministro, el fomento de la innovación tecnológica o el almacenamiento estratégico. Este informe es un paso esencial para aumentar la concienciación sobre este tema, que hasta hace poco no había recibido la atención que merecía. Sin embargo, se queda corto en cuanto al impacto que la escasez de minerales puede tener en el desarrollo de las economías y del planeta. Por ello, analizamos el informe sección por sección y aportamos algunos comentarios adicionales sobre aspectos que podrían abordarse más a fondo para evitar sustituir la adicción a los combustibles fósiles por la dependencia de las materias primas.

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“…For leaching of the columbite-tantalite ore samples, twostep binary acid system was employed using the mixture of hydrofluoric (HF) and sulfuric acids (HCl). First, the digestion of the coltan ore was placed in a polypropylene beaker with 8 M HF and stirred at room temperature for 3 h, followed by adding 8 M HCL and stirring the mixture at 80°C for 8 h. Then, the dissolved metals was filtrated 29,33,57 . Secondly, the liquid-liquid extraction was carried out with 10 mL of filtrated solution added to 10 mL methyl isobutyl ketone (MIBK) and maintained at 25°C for 15 min to form the organo-metallic complex [58][59][60] .…”

Section: Mineral Extractionmentioning

confidence: 99%

Extraction of non-noble metal columbite-tantalite as a highly efficient electrocatalyst for water splitting

Bacirhonde¹,

Dzade²,

Chalony³

et al. 2021

Preprint

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The development of robust and inexpensive electrocatalysts that are capable of catalyzing the overall water splitting reaction is highly essential for large scale production of hydrogen. Herein, we report the successful liquid-liquid extraction and hydrothermal synthesis of a highly stable columbite-tantalite electrocatalysts (Fe0.79Mn0.21Nb0.16Ta0.84O6) with remarkable HER and OER performance in alkaline media. The extracted Fe0.79Mn0.21Nb0.16Ta0.84O6 electrocatalyst shows a low overpotential of 190.2 and 284.8 mV at 10/mA cm-2 in current density in situ for HER and OER, respectively. The electrocatalyst also exhibited low Tafel slopes of 56.36 mV/dec for HER and 112.85 mV/dec for OER, verifying their rapid catalytic kinetics. The electrolyzer maintained the cell voltage of 1.63 V and potential-time stability close to that of Pt/C & RuO2/C. The intrinsic mechanism for the exceptional HER and OER performance was further unravelled through first-principles density functional theory (DFT) calculations, predicting very low Gibbs free energy of hydrogen adsorption (ΔGH* ≈ 0.09 eV) and low overpotential (η = 0.47 eV at the Mn sites) for OER on the Fe0.75Mn0.25Ta1.875Nb0.125O6 catalyst. Our results demonstrate that columbite-tantalite electrocatalysts offer great promise for efficient overall water splitting. Graphical abstract

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Recovery of niobium and tantalum by solvent extraction from Sn–Ta–Nb mining tailings

Abstract: The slag from the extraction processes of metals from their ores may contain valuable components that, if adequately recovered, can be reintroduced in the technological life cycle.

Cited by 33 publications

References 21 publications

Characterization of K6Ta10.8O30 Microrods with Tetragonal Tungsten Bronze-Like Structure Obtained from Tailings from the Penouta Sn-Ta-Nb Deposit

Characterization of K6Ta10.8O30 Microrods with Tetragonal Tungsten Bronze-Like Structure Obtained from Tailings from the Penouta Sn-Ta-Nb Deposit

Resumen y análisis crítico del informe especial de la Agencia Internacional de la Energía: El Rol de los minerales críticos en la transición hacia energías limpias

Extraction of non-noble metal columbite-tantalite as a highly efficient electrocatalyst for water splitting

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