Correction to: Efficient Extraction of Ta and Nb from a Coltan Ore Through Alkaline Roasting, Water Leaching, Precipitation, and Oxalic Acid Leaching (Journal of Sustainable Metallurgy, (2022), 8, 4, (1932-1947), 10.1007/s40831-022-00621-w)

Figure 6 was incorrectly plotted in the article, showing an XRD pattern corresponding to the KOH/ore mass ratio of 10/1 and having a background noise similar to the one at the 6/1 ratio. This error occurred when importing the data from the XY raw data file into the Prism software workbook. This has resulted in misrepresentation of the XRD pattern. Furthermore, because in the second paragraph of the section “Characterization of the Water‑Leached Residues” the text refers only to the XRD patterns of 13.2/1 and 6/1 mass ratio, the authors would like to replace the 10/1 ratio pattern with the 13.2/1 one. In such a way Figure 6 is modified as shown here: Incorrect version: (Figure presented.) XRD patterns of the leached residue under different KOH/ore molar ratios (roasting temperature: 450 °C, ore granulometry: − 105 + 75 μm, roasting duration: 2 h) Correct version: (Figure presented.) XRD patterns of the leached residue under different KOH/ore molar ratios (roasting temperature: 450 °C, ore granulometry: − 105 + 75 μm, roasting duration: 2 h) In addition, in the section “Ore Characterization”, second paragraph, the λ = 15,406 Å should be read λ = 1.54 Å. The authors would like to thank both the anonymous reader and the editor who informed us of the error and sincerely apologize for any inconvenience caused. The raw data linked to the results could be shared upon request.