Separation of niobium from ferroniobium by chlorine metallurgy has been investigated in order to effect a new process for the mass production of niobium due to the increasing demand for this element. From thermodynamical considerations, the chlorination of ferroniobium by chlorine gas was con-ducted under several conditions, and the most effective conditions were determined. Ferroniobium chlorides obtained were shown to be ferric chloride and niobium pentachloride. Preliminary separation of niobium pentachloride from ferric chloride is possible by selective condensation with temperature gradient techniques. Selective reduction of ferric chloride to ferrous chloride by iron powder was conducted to separate niobium pentachloride from ferrous chloride by their volatility difference. Separation of niobium from ferroniobium by chlorine metallurgy is summarized in a flowsheet, and a new dry methods process, which is simplified compared with the current process, is obtained.
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