Application:

Niobium additive to ‘high strength low alloy’ steel and stainless steel for oil and gas pipelines, car and truck bodies, architectural requirements, tool steels, ships’ hulls, railroad tracks.

• Manufacture lithium niobate for surface acoustic wave filters.
• Camera lenses.
• Coating on glass for computer screens.
• Ceramic capacitors.

Cutting tool compositions.
Niobium capacitors for electronic circuits.

• Sputtering targets.
• Cathode protection systems for large steel structures.
• Chemical processing equipment.

Superconducting magnetic coils in magnetic resonance imagery (MRI), magneto encephalography, magnetic levitation transport systems, particle physics experiments.

• Sodium vapor lamps
• Chemical processing equipment

Super alloy additions for turbine blade applications in jet engines and land-based turbines. Inconel family of alloys, super alloys.

Two separate processing schemes are utilized for niobium production. Those companies that mine pyrochlore convert the niobium oxide units into HSLA ferro-niobium through the aluminothermic reduction process or by reduction in an electric arc furnace. CBMM has installed capacity for the production of a high purity oxide that can be used to produce vacuum grade ferro- and nickel-niobium as well as niobium metal ingots via electron beam refining.

The use of columbite and tantalum-bearing ores, such as tantalite, as feedstock’s results in the necessity to process these materials chemically as described in the tantalum section. The purified niobium-containing process stream is generally converted to niobium hydroxide by the introduction of ammonia, followed by washing, filtration, and calcining to the oxide. Purities exceeding 99.99% can be achieved.

Niobium oxide (Nb2O5) is generally the starting chemical for the production of other compounds, such as niobium chloride (NbCl5), niobium carbide (NbC), or lithium niobate (LiNbO3). Niobium metal is produced by the aluminothermic reduction of the oxide followed by electron beam refining. Niobium powders can be produced by the reduction of potassium niobium heptafluoride (K2NbF7) with sodium, or by the reduction of niobium oxide with magnesium.

The various metallurgical products are generally produced from electron beam or vacuum arc melted niobium ingot. Double and triple melt ingots achieve a very high level of purification with respect to metallics and interstitial elements. Ingots are used to produce niobium alloys such as niobium-1% zirconium, niobium-titanium, C-103, Inconels, and others.

Several capacitor manufacturers are developing capacitors using niobium metal powder or niobium oxide, and these models are gradually being brought to the market.