Production and General information about niobium
Over 80% of extraction of niobium in the world is accounted for by Brazil. Rich deposits are found in Canada and Nigeria. For industrial production have a value of two major mineral is columbite and pyrochlore. The main difficulty lies in the separation of niobium from tantalum (compounds which have similar properties).
Niobium is the 41st element on the periodic table of D. I. Mendeleev. This refractory metal with a silvery-grayish color. In industry, niobium is used both in pure form and as alloying component.
|The proportion||8,57 g/cm3|
|Melting point||2468 °C|
|Boiling point||4742 °C|
|The specific heat of fusion||Of 26.8 kJ/mol|
|The latent heat of vaporization||680 kJ/mol|
|The degree of oxidation||5, 4, 3, 2, 1|
- good machinability;
- corrosion resistance;
- excellent weldability;
- getter properties.
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