The Extraction of Niobium and Tantalum from Columbite by the Nitrofluor Process

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概要

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• The Nitrofluor process provides a through method of dissolving the columbite in a nonaqueous inorganic solvent, purifying the niobium and tantalum, and separating them each other by volatile separation techniques. HF solutions of N_2O_3, N_2O_4 or NOF can disintegrate the columbite even at a room temperature. Subsequently, most of the niobium and tantalum precipitate as complex fluorides, leaving in the solution relatively large quantities of impurities, such as iron, manganese, titanium and tin. For further isolation of the complex fluorides of niobium and tantalum from the impurities, a volatilization of the niobium and tantalum from the dissolver solid separated from the dissolver solution is found effective. There appears to be a possibility of separating niobium and tantalum from each other by fractional sublimation utilizing the difference of volatility of these complex fluorides when the HF-N_2O_3 azeotrope is used for disintegrating the columbite. A general flowsheet for treating typical columbite or tantalite by the Nitrofluor process is proposed.

• 東北大学の論文

著者

• KIGOSHI Akiichi

  The Research Institute of Mineral Dressing and Metallurgy

• OHMI Mitsuo

  The Research Institute of Mineral Dressing and Metallurgy

• OKADA Kokichi

  The Research Institute of Mineral Dressing and Metallurgy

関連論文

• Fluidized-Bed Roasting of Pyrite
• Fundamental Studies on Uranium Oxides. I : Equilibria among UO_2, U_4O_9 and U_3O_8 at 360〜580℃
• Studies on Treatment of Uranium Ores. I : Leaching of Uranium Ore from the Matsuiwa Mine
• Studies on Treatment of Uranium Ores. II : Recovery of Uranium from Leach Liquors of a Uranium Ore from the Matsuiwa Mine
• The Behavior of Silicon and Aluminum in the Nitrofluor Process
• Fundamental Studies on Uranium Oxides. II : Equilibria among UO_2, U_4O_9 and U_3O_8 at 500〜1, 200℃
• The Extraction of Niobium and Tantalum from Columbite by the Nitrofluor Process
• The Recovery of Beryllium from Beryl by a Nonaqueous HF-NO_2 Solution
• The Recovery of Titanium from Ilmenite by the Nitrofluor Process
• Fundamental Researches on Metallurgical Treatment of Manganese Ores. I : On the Equilibrium in the Reduction of Mn_3O_4 with CO.

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