Physical and chemical characteristics:
- Latin name: Cobaltum, (Ñî);
- Chemical element of Group VIII in Mendeleev's periodic table;
- Atomic number 27;
- Atomic weight 58,9332;
- Siver-white metal with a reddish shade;
- Density 8.90 ã/ñì3;
- Melting point 1494°C;
- At usual temperature on air chemically racks.
History:
The Name of metal has taken place from German Kobold - house, the gnome. Connections of cobalt were known and were applied in an extreme antiquity. The Egyptian glass jug concerning to XV in was kept. Up to AD, painted by salts of cobalt, and also blue hyaline the bricks containing cobalt. In ancient Assyria, and also in Babylon from cobalt produced lazurite - a blue paint which poured over ceramic products.
Use:
In the pure state cobalt do not apply, but it is the major component of alloys, special steels and the special constant magnets, having a strong magnetic field.
Also cobalt is part heat resisting, superfirm corrosion-resisting alloys. Steel for manufacturing cutting tools frequently contain cobalt.
In some cases this metal use as galvanic coverings as they are steadier to influence of weak acids, than chromic or nickel.
Cobalt chloride is applied to manufacture of a dark blue and blue decorative glass.
In the chemical industry metal and its salts are applied mainly as catalysts of various chemical processes. Salts of cobalt add in paints and varnishes for acceleration of process of their drying.
Radioactive cobalt is applied as a source scale - beams at treatment of a cancer and in research works.
It has also significant biological value. In microdozes cobalt is a necessary element for normal ability to live of many plants and animals.
At the same time the increased concentration of cobalt's compounds are toxic.
Cobalt produced by Norilsk Nickel
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