Production of pure tantalum and niobium oxides by hydrometallurgical processing of coltan smelter cake from Tanganyika Province/RD Congo using NH4HF2-KOH flux system

• Autorzy: Kitungwa Bertin K. , Yuma Phalaris M. , Kalenga Mubiayi. Pierre , Shengo Michel L. , Ngubeni Grace , Moloto Nosipho , Mbayo Marsi K. , Kyona Crépin W.

Identyfikatory

DOI

10.37190/ppmp/192436

• Języki publikacji: EN

Abstrakty

EN

Pure tantalum and niobium oxides were produced from the molten cake after mixing oreNH₄HF₂-KOH in a respective mass ratio of 1/4/3. This resulted in solubilization yields of over 95% for Nb and around 92% for Ta in sulfuric acid solution 3 molar. Extraction of tantalum and niobium using octan-2-ol yielded over 95% niobium and 98% tantalum when pH is set at 0.5-1.0 and 1.5-2 respectively. The compounds K₃NbOF₆, K₃NbO₄ and K₂TaF₇ were identified after melting. While in aqueous solution ionic species such as NbF₆ (OH) ₂^3-, NbF₆^- and TaF₇^2- are likely to be identified. Precipitation of tantalum and niobium in NH₄OH solution (pH=7.50-8.0) as hydrated oxides after stripping with distilled water and crystallization identified hydrated oxides such as Ta₂O₅.nH₂O, Nb₂O₅.nH₂O. These two oxides were associated with a small amount of SiO₂.nH₂O as an impurity resulting from the extraction and precipitation of tantalum and niobium. SEM-EDS, XRD, TGA-DTG and FTIR analyses identified and characterized these compounds.

Słowa kluczowe

EN

Molten Coltan ore; ammonium bifluoride; potassium hydroxide; hydrometallurgical recovery of Ta and Nb; species identification

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Physicochemical Problems of Mineral Processing
• Rocznik: 2024
• Tom: Vol. 60, iss. 4
• Strony: art. no. 192436
• Opis fizyczny: Bibliogr. 59 poz., rys., tab., wykr.

Twórcy

autor

Kitungwa Bertin K.

• Department of Chemistry, Faculty of Sciences, University of Lubumbashi, Haut-Katanga, DR Congo

autor

Yuma Phalaris M.

• Department of Chemistry, Faculty of Sciences, University of Lubumbashi, Haut-Katanga, DR Congo

autor

Kalenga Mubiayi. Pierre

• Faculty of Sciences, Molecular Science Institute, African Research University Alliance-Center of Excellence-Materials for Energy and Nanotechnology, University of Witwatersrand, Johannesburg, RSA

autor

Shengo Michel L.

• Department of Chemistry, Faculty of Sciences, University of Lubumbashi, Haut-Katanga, DR Congo

autor

Ngubeni Grace

• Faculty of Sciences, Molecular Science Institute, African Research University Alliance-Center of Excellence-Materials for Energy and Nanotechnology, University of Witwatersrand, Johannesburg, RSA

autor

Moloto Nosipho

• Faculty of Sciences, Molecular Science Institute, African Research University Alliance-Center of Excellence-Materials for Energy and Nanotechnology, University of Witwatersrand, Johannesburg, RSA

autor

Mbayo Marsi K.

• Department of Chemistry, Faculty of Sciences, University of Lubumbashi, Haut-Katanga, DR Congo

autor

Kyona Crépin W.

• Department of Chemistry, Faculty of Sciences, University of Lubumbashi, Haut-Katanga, DR Congo

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