Decomposition of the Kenticha mangano-tantalite ore by HF/H2SO4 and KOH fusion

• Autorzy: Berhe G. G. , Velázquez del Rosario A. , Tadesse B. , Yimam A. , Woldetinsae G.

Identyfikatory

DOI

10.5277/ppmp1840

• Języki publikacji: EN

Abstrakty

EN

In this study, the decomposition behavior of Ta and Nb from the mangano-tantalite ore was investigated using HF/H2SO4 mixture and KOH fusion. The effects of reaction time, decomposition temperature, acid and alkaline concentrations, and particle size on the dissolution process were examined. Higher decomposition rates were achieved at 6:2 mol/dm3 ratio of HF and H2SO4, and with the addition of 10 g KOH in the alkali fusion step. In addition, similar trends in decomposition rates between two agents (HF/H2SO4 and KOH) and comparable dissolution performances were observed. The increase in the decomposition temperature initially increased the decomposition rate of mangano-tantalite for the two systems considered in this study. However, no significant change in the leaching rate of Ta and Nb was observed beyond 50 °C for the HF/H2SO4 system and above 400 °C when using the KOH fusion process. The elemental and compositional analyses of the leached residues using XRF, XRD, and FT-IR spectroscopy indicated that the acid (mixture of HF and H2SO4) decomposition resulted in slightly better dissolution performance for Ta compared with the alkaline fusion method. Overall, the results indicated that KOH can be a suitable alternative decomposition agent to the volatile, corrosive and toxic HF in the hydrometallurgical processing of tantalite ores.

Słowa kluczowe

EN

decomposition; Kenticha pegmatite; mangano-tantalite; Ta; Nb

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Physicochemical Problems of Mineral Processing
• Rocznik: 2018
• Tom: Vol. 54, iss. 2
• Strony: 406--414
• Opis fizyczny: Bibliogr. 18 poz., rys., tab.

Twórcy

autor

Berhe G. G.

• School of Materials Science and Engineering, Jimma Institute of Technology, Jimma University, PO Box 378, Jimma, Ethiopia
• Department of Chemistry, College of Natural and Computational Science, Mekelle University, PO Box 823, Mekelle, Ethiopia

autor

Velázquez del Rosario A.

• School of Materials Science and Engineering, Jimma Institute of Technology, Jimma University, PO Box 378, Jimma, Ethiopia

autor

Tadesse B.

• Department of Mining Engineering and Metallurgical Engineering, Western Australian School of Mines, Curtin University, Kalgoorlie, WA 6430, Australia

autor

Yimam A.

• School of Chemical and Bio Engineering, AAiT, Addis Ababa University, PO Box 1176, Addis Ababa, Ethiopia

autor

Woldetinsae G.

• Research and Development Directorate, Federal Democratic Republic of Ethiopia, Ministry of Mines, Petroleum and Natural Gas, PO Box 486, Addis Ababa, Ethiopia

Bibliografia

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Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).