Extraction of Niobium and Tantalum Oxides From Columbite Concentrate Using Microwave Processing and Solvent Extraction

Tanvar, Himanshu; Sinha, Manish Kumar; Habinshuti, Jean Baptiste; Mishra, Brajendra

doi:10.1007/s11663-022-02713-0

Cited by 8 publications

(2 citation statements)

References 29 publications

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“…We therefore conclude that Cr and V doping do not result in competitive thermoelectric performance compared to doping with heavier second-and third-row Group V/VI transition metals. With the aim of avoiding heavy elements and using more abundant and lower-cost elements, Nb is much more attractive as a dopant due to its higher abundance and lower cost [65,66] together with the relatively high predicted PFs of Nb-doped STO (figure 6). Finally, we also compared our predictions for Nb-doped STO with experimental measurements on STO with Nb doping levels of 10-15 mol% [56], bracketing the 12.5% in our model (figure 7).…”

Section: Group V and Vi B-site Doped Srtiomentioning

confidence: 99%

Electronic transport and the thermoelectric properties of donor-doped SrTiO₃

Zhu,

Skelton,

Lewis

et al. 2024

J. Phys. Energy

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Strontium titanate (SrTiO3) is widely recognised as an environmentally-benign perovskite material with potential for thermoelectric applications. In this work we employ a systematic modelling approach to study the electronic structure and thermoelectric power factor of pure SrTiO3 and donor-doped Sr(Ti0.875M0.125)O3 (M = Cr, Mo, W, V, Nb, Ta). We find that the carrier concentration required to optimise the power factor of SrTiO3 is on the order of 1021 cm-3, in line with experimental studies. Substitution at the Ti (B) site with 12.5 mol% Nb or Ta is predicted to yield the best power factor among the six Group V/VI dopants examined, balancing the Seebeck coefficient and electrical conductivity, and doping with the more abundant Nb would likely give the best price/performance ratio. Although W doping can significantly improve the electrical conductivity, this is at the expense of a reduced Seebeck coefficient. The first-row elements V and Cr have a significantly different impact on the electrical properties compared to the other dopants, forming resonant levels or creating hole carriers and leading to poor thermoelectric performance compared to the second- and third-row dopants. However, the reduction in the bandgap due obtained with these dopants may make the materials suitable for other applications such as photovoltaics or photocatalysis. Our modelling reveals the critical carrier concentrations and best B-site dopants for optimising the electrical properties of SrTiO3, and our predictions are supported by good agreement with available experimental data. The work therefore highlights avenues for maximising the thermoelectric properties of this archetypal oxide material.

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Section: Group V and Vi B-site Doped Srtiomentioning

confidence: 99%

Electronic transport and the thermoelectric properties of donor-doped SrTiO₃

Zhu,

Skelton,

Lewis

et al. 2024

J. Phys. Energy

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“…cobalt, lithium, nickel), it is expected that the battery recycling flowsheet can be simply adapted by including additional separation steps to target the recovery of Nb 2 O 5 with positive outcomes (Echion Technologies, personal communication). Despite recovery rates for Nb 2 O 5 from batteries being currently unavailable, it is anticipated that it could be more than 95% through selective solvent extraction which is the most common step used in commercial Nb 2 O 5 extraction [70,71], and will also most likely be used in Nb 2 O 5 recycling.…”

Section: A Reflection On the Importance Of Raw Materials Diversificat...mentioning

confidence: 99%

Towards Environmentally Sustainable Battery Anode Materials: Life Cycle Assessment of Mixed Niobium Oxide (Xno™) and Lithium-Titanium-Oxide (Lto)

Lima¹,

Wu²,

Cadena³

et al. 2023

SSRN Journal

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Preliminary Investigation on the Thermodynamic Evaluation and Phase Evolution of Soda Ash-Assisted Roast Treatment of Alluvial Columbite for Recovery of Niobium and Tantalum

Nzeh,

Popoola,

Kgwedi

et al. 2024

JOM

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Alkaline roasting of a low-grade alluvial silica-based columbite bearing mineral from the Rayfield–Jos deposits (located in South Jos, Plateau state, Federal Republic of Nigeria) was conducted with specific emphasis on the evaluation of thermodynamic reactions as well as the mineral phase evolution during the extraction of Nb and Ta. An isothermal roasting procedure was investigated in order to understand the effects of different soda ash to sample mass ratios as well as the roasting temperatures on the measure or rate of the recoveries of Nb and Ta complexes. Thus, the feasibility rate of a successful alluvial columbite mineral roasting was determined to be influenced by certain optimal process conditions or optimum values of the study parameters, such as alkali to sample mass ratio and, more essentially, the roasting temperature. Therefore, the thermodynamic feasibility of the alkali-carbothermic roasting procedure was also investigated and the resulting chemical reactions were evaluated using the HSC chemistry 9.0 software. Premised on this, the results obtained as well as the thermodynamic data realized from the study demonstrated the feasibility of successful dissolutions of Nb and Ta into a pregnant leached-liquor stream (PLS), without the use of the conventional harmful, hazardous, toxic, and environmentally unfriendly hydrofluoric (HF) acid.

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Extraction of Niobium and Tantalum Oxides From Columbite Concentrate Using Microwave Processing and Solvent Extraction

Cited by 8 publications

References 29 publications

Electronic transport and the thermoelectric properties of donor-doped SrTiO₃

Electronic transport and the thermoelectric properties of donor-doped SrTiO₃

Towards Environmentally Sustainable Battery Anode Materials: Life Cycle Assessment of Mixed Niobium Oxide (Xno™) and Lithium-Titanium-Oxide (Lto)

Preliminary Investigation on the Thermodynamic Evaluation and Phase Evolution of Soda Ash-Assisted Roast Treatment of Alluvial Columbite for Recovery of Niobium and Tantalum

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Extraction of Niobium and Tantalum Oxides From Columbite Concentrate Using Microwave Processing and Solvent Extraction

Cited by 8 publications

References 29 publications

Electronic transport and the thermoelectric properties of donor-doped SrTiO3

Electronic transport and the thermoelectric properties of donor-doped SrTiO3

Towards Environmentally Sustainable Battery Anode Materials: Life Cycle Assessment of Mixed Niobium Oxide (Xno™) and Lithium-Titanium-Oxide (Lto)

Preliminary Investigation on the Thermodynamic Evaluation and Phase Evolution of Soda Ash-Assisted Roast Treatment of Alluvial Columbite for Recovery of Niobium and Tantalum

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Electronic transport and the thermoelectric properties of donor-doped SrTiO₃

Electronic transport and the thermoelectric properties of donor-doped SrTiO₃