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Volume 15
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10.3390/min15080828
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Correction

Correction: Shikika et al. Extraction of Ta and Nb from a Coltan Bearing Ore by Means of Ammonium Bifluoride Fluorination and Sulfuric Acid Leaching. Minerals 2021, 11, 1392

by
Alidor Shikika
1,2,*,
Francois Zabene
2,
Fabrice Muvundja
2,3,
Mac C. Mugumaoderha
2,3,4,
Julien L. Colaux
4,
Mohamed Aatach
1 and
Stoyan Gaydardzhiev
1
1
GeMMe-Mineral Processing and Recycling, University of Liège, 4000 Liege, Belgium
2
Unité de Recherche en Sciences et Technologies Innovantes des Matériaux et de l’Envirronnement (URSTIME), Institut Supérieur Pédagogique de Bukavu (ISP Bukavu), Bukavu B.P. 854, Democratic Republic of the Congo
3
Centre de Recherche en Environnement et Géo-Ressources (CREGéR), Université Catholique de Bukavu (UC Bukavu), Bukavu B.P. 285, Democratic Republic of the Congo
4
Namur Institute of Structured Matter (NISM), Synthesis, Irradiation and Analysis of Materials Platform (SIAM), University of Namur, 5000 Namur, Belgium
*
Author to whom correspondence should be addressed.
Minerals 2025, 15(8), 828; https://doi.org/10.3390/min15080828 (registering DOI)
Submission received: 25 July 2025 / Accepted: 29 July 2025 / Published: 4 August 2025
(This article belongs to the Special Issue Moving towards the Crystal Structure, Molecular or Atomic-Scale for Green and Novel Hydrometallurgical Processing)
Browse Figure
Versions Notes

Contact Information Correction

The contact details of the author Alidor Shikika have been updated.

Text Correction

The original publication [1] contained a typographical error in the XRD data collection description (radiation source wavelength), and a mistake in the XRD data itself (ABF/ore mass ratio of 3/1) due to a copy–paste error.
A correction has been made to Section 2. Materials and Methods, Subsection 2.2. Ore Characterization, second paragraph:
The mineral-phase analysis of the ore was carried out by an X-ray Bruker D8-ECO diffractometer with CuKα radiation (λ = 1.54 Å). The sample was pulverized before being scanned between 3 and 90°2θ at a rate of 0.02°2θ per second.

Error in Figure

In the original publication, there was a mistake in Figure 13 as published. The XRD pattern (b) corresponding to the ABF/ore mass ratio of 3/1 was incorrectly plotted when importing data from the XY file, leading to data misrepresentation. The corrected Figure 13 appears below.
The authors state that the scientific conclusions are unaffected. This correction was approved by the Academic Editor. The original publication has also been updated.

Reference

  1. Shikika, A.; Zabene, F.; Muvundja, F.; Mugumaoderha, M.C.; Colaux, J.L.; Aatach, M.; Gaydardzhiev, S. Extraction of Ta and Nb from a Coltan Bearing Ore by Means of Ammonium Bifluoride Fluorination and Sulfuric Acid Leaching. Minerals 2021, 11, 1392. [Google Scholar] [CrossRef]
Minerals 15 00828 g001
Figure 13. XRD patterns of the raw coltan ore (a) and residues from fluorination and acid leaching at 200 °C for 2.5 h at ABF/ore ratios of 3/1 (b) and 5/1 (c).
Figure 13. XRD patterns of the raw coltan ore (a) and residues from fluorination and acid leaching at 200 °C for 2.5 h at ABF/ore ratios of 3/1 (b) and 5/1 (c).
Minerals 15 00828 g001
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MDPI and ACS Style

Shikika, A.; Zabene, F.; Muvundja, F.; Mugumaoderha, M.C.; Colaux, J.L.; Aatach, M.; Gaydardzhiev, S. Correction: Shikika et al. Extraction of Ta and Nb from a Coltan Bearing Ore by Means of Ammonium Bifluoride Fluorination and Sulfuric Acid Leaching. Minerals 2021, 11, 1392. Minerals 2025, 15, 828. https://doi.org/10.3390/min15080828

AMA Style

Shikika A, Zabene F, Muvundja F, Mugumaoderha MC, Colaux JL, Aatach M, Gaydardzhiev S. Correction: Shikika et al. Extraction of Ta and Nb from a Coltan Bearing Ore by Means of Ammonium Bifluoride Fluorination and Sulfuric Acid Leaching. Minerals 2021, 11, 1392. Minerals. 2025; 15(8):828. https://doi.org/10.3390/min15080828

Chicago/Turabian Style

Shikika, Alidor, Francois Zabene, Fabrice Muvundja, Mac C. Mugumaoderha, Julien L. Colaux, Mohamed Aatach, and Stoyan Gaydardzhiev. 2025. "Correction: Shikika et al. Extraction of Ta and Nb from a Coltan Bearing Ore by Means of Ammonium Bifluoride Fluorination and Sulfuric Acid Leaching. Minerals 2021, 11, 1392" Minerals 15, no. 8: 828. https://doi.org/10.3390/min15080828

APA Style

Shikika, A., Zabene, F., Muvundja, F., Mugumaoderha, M. C., Colaux, J. L., Aatach, M., & Gaydardzhiev, S. (2025). Correction: Shikika et al. Extraction of Ta and Nb from a Coltan Bearing Ore by Means of Ammonium Bifluoride Fluorination and Sulfuric Acid Leaching. Minerals 2021, 11, 1392. Minerals, 15(8), 828. https://doi.org/10.3390/min15080828

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