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AssigneeFederalnoe Gosudarstvennoe Unitarnoe Predpriyatie Gousudarstvenny Nauchno-Issledovatelsky I Proektny Institut Redkometallicheskoi Promyshlennosti “Giredmet”
InventorsVoronenko Ljudmila Ivanovna, Eljutin Alexandr Vyacheslavovich, Kovalev Kirill Semenovich, Kovalev Felix Vladimirovich
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A method for producing high-purity niobium involves refining crude niobium in an electrolyte comprising a melt of salts containing a complex niobium and potassium fluoride and an equimolar mixture of alkaline metal chlorides, said electrolyte further containing sodium fluoride in the amount of from 5 to 15 wt %, and subjecting the obtained cathode deposit to electron-beam melting in a vacuum free of oil vapors under a residual gas pressure of from 5*10−5 to 5*10−7 mm Hg, a melting rate of from 0.7 to 2 mm/min and a leakage into a melting chamber from 0.05 to 0.005 l ·μm/s to produce an ingot of niobium. The method produces high-purity niobium having the total amount of impurities within the range of from 0.002 to 0.007 wt % which satisfies the requirements imposed on the materials used in microwave technology and microelectronics, with reduced losses of niobium in both of the refining stages and increased yield of high-purity niobium.
A method for producing high-purity niobium by refining crude niobium in an electrolyte consisting of a melt of salts including a complex niobium and potassium fluoride and an equimolar mixture of alkali metal chlorides, said electrolyte further containing sodium fluoride in the amount of from 5 to 15% by weight, and subjecting the obtained cathode deposit to electron-beam melting in a vacuum free of oil vapors at a residual gas pressure in the range of from 5*10−5 to 5*10−7 mm Hg, a melting rate from 0.7 to 2 mm/min and a leakage into the melting chamber from 0.05 to 0.005 1·μm/s to produce an ingot of niobium.
Dependencies are inferred from the claim text.