Acid leaching and thermal treatments in the obtaining of mixed oxides of Nb and Ta from ferrocolumbite

Oliveira, Tiago Fernandes de; Souza, Carlson Pereira de; Moriyama, André Luís Lopes

doi:10.1016/j.mineng.2019.106157

Cited by 12 publications

(18 citation statements)

References 29 publications

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“…Thus, the authors however concluded that KOH possess the potential of being a suitable alternative or substitute material to the conventionally utilized HF acid. Similarly, De Oliveira, De Souza and Lopes-Moriyama [69], conducted investigations on alkaline thermal treatments with subsequent acid leaching on a ferro-columbite mineral in order to obtain mixed proportions of Ta and Nb oxides. The study however reported good yield recoveries, employing alkali fusion with potassium bisulphate (KHSO 4 ) and subsequent HCl acid leaching.…”

Section: Literature Overview Of the Pyro-hydrometallurgical Recovery ...mentioning

confidence: 99%

Pyrometallurgical Approach in the Recovery of Niobium and Tantalum

Nzeh¹,

Mokgalaka²,

Maila³

et al. 2024

Extraction Metallurgy - New Perspectives

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The pyrometallurgical methods of the recovery of various critical metals have been established. Certain pyrometallurgical approaches for niobium (Nb) and tantalum (Ta) extraction have been studied and investigated by several researchers. For instance, the conventional reduction of Nb mineral or Nb2O5 to Nb metal has been conducted over the decades. Albeit, the success level of this process, it however involves the consumption of lots of energy, high cost of equipment/equipment maintenance, somewhat low Nb and Ta recovery and limited effectiveness on low grade minerals; and thus, considered cost intensive and inefficient. In addition, the inadequacies of pyrometallurgical extraction of these metals from their complex, low grade mineral ores due to its difficulty and large energy requirement in melting the elemental impurities and gangue minerals have been a major concern. On this premise therefore, the study will provide insights into recent pyrometallurgical techniques of Nb and Ta extraction as well as associated factors and challenges.

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Section: Literature Overview Of the Pyro-hydrometallurgical Recovery ...mentioning

confidence: 99%

Pyrometallurgical Approach in the Recovery of Niobium and Tantalum

Nzeh¹,

Mokgalaka²,

Maila³

et al. 2024

Extraction Metallurgy - New Perspectives

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“…However, a combination of HF and HNO 3 or H 2 SO 4 , was demonstrated to be feasible for minerals that show Nb and Ta at trace concentrations. [ 9,19,33,39 ]…”

Section: Niobium and Tantalum Extractionmentioning

confidence: 99%

“…[ 18 ] So Nb and Ta oxide's reaction in fluoride media is presented in Reactions () and (). [ 33 ]

{Nb}_{2} {normalO}_{5} + 10 HF \to {2H}_{2} ({NbOF}_{5}) + {3H}_{2} O

{Ta}_{2} {normalO}_{5} + 16 HF \to {2H}_{2} ({TaF}_{7}) + {5H}_{2} O

…”

Section: Niobium and Tantalum Extractionmentioning

confidence: 99%

Niobium and tantalum recovery from the primary source and from tin slag, an industrial challenge: A review

et al. 2022

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“…Other studies have been carried out with the aim of drastically reducing the amount of hydrofluoric acid or fluorine used in leaching, while keeping the recoveries of Ta and Nb above 90%. Among these studies, Rodriguez et al [15] were able to bring 91% of Ta and 95% of Nb into solution by leaching a ferrocolombite ore with a mixture of HF (15%) and tartaric acid C 4 H 6 O 6 (15%) at 220 • C. Yang et al [16] were able to demonstrate an extraction rate of over 93% Ta and 96% Nb from mangano-tantalite Mn(Ta,Nb) 2 O 6 under pressure leaching at 200 • C using a mixture of 50% H 2 SO 4 and NH 4 F. Other approaches based on the production of Ta-Nb concentrates have been proposed in several studies [17][18][19]; however, they do not feature Ta and Nb separation. Other studies have been carried out with the aim of drastically reducing the amount of hydrofluoric acid or fluorine used in leaching, while keeping the recoveries of Ta and Nb above 90%.…”

Section: Introductionmentioning

confidence: 99%

“…Yang et al [16] were able to demonstrate an extraction rate of over 93% Ta and 96% Nb from mangano-tantalite Mn(Ta,Nb)2O6 under pressure leaching at 200 °C using a mixture of 50% H2SO4 and NH4F. Other approaches based on the production of Ta-Nb concentrates have been proposed in several studies [17][18][19]; however, they do not feature Ta and Nb separation.…”

Section: Introductionmentioning

confidence: 99%

Extraction of Ta and Nb from a Coltan Bearing Ore by Means of Ammonium Bifluoride Fluorination and Sulfuric Acid Leaching

et al. 2021

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A novel approach for Ta and Nb extraction consisting of the pre-treatment of a coltan-bearing ore with an ammonium bifluoride sub-molten salt and subsequent acid leaching has been studied. The effects from ore granulometry, ammonium bifluoride (ABF) to ore mass ratio, temperature and duration of fluorination on the degree of Ta and Nb extraction were examined. The ABF to ore ratio and process temperature were found to have the most pronounced impact on extraction efficiency. The following optimal process conditions were determined: ore granulometric fraction (−75 + 45 µm), ABF-ore (5/1), fluorination temperature (200 °C) and fluorination time (2.5 h). Maintaining these parameters enabled about 94% of Ta and 95% of Nb to be brought into solution during the sulfuric-acid-leaching stage. A comparison of the proposed method with previously reported studies suggests that due to the effects of mechanical agitation and the recirculation of the HF-containing gaseous phase back into the process, the dosage rate of ABF at the fluorination stage could be reduced significantly without sacrificing the overall recovery of Ta and Nb. In such a way, the approach could offer added environmental benefits since release of fluoride-containing effluents into the environment could be limited.

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Acid leaching and thermal treatments in the obtaining of mixed oxides of Nb and Ta from ferrocolumbite

Cited by 12 publications

References 29 publications

Pyrometallurgical Approach in the Recovery of Niobium and Tantalum

Pyrometallurgical Approach in the Recovery of Niobium and Tantalum

Niobium and tantalum recovery from the primary source and from tin slag, an industrial challenge: A review

Extraction of Ta and Nb from a Coltan Bearing Ore by Means of Ammonium Bifluoride Fluorination and Sulfuric Acid Leaching

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