Mining and General data on cobalt
It is the 27th element of a side subgroup of the period IV, VIII groups of the periodic table,-solid metal, with two modifications: It is a ferromagnet with Curie temperature equal to 1121 °C.
Them rich deposits of this metal are almost exhausted today. The source of cobalt-containing raw material is Nickel ores which require beneficiation to obtain a concentrate. The concentrate is treated with a solution of sulfuric acid, or ammonia, or methods receive the pyrometallurgy of sulfide or metal alloy. This alloy is then subjected to leaching.
The most difficult to separate cobalt from close to it in chemical properties of Nickel. The solution containing the cations of these two metals is treated with strong oxidizing agents chlorine or sodium hypochlorite. Black precipitate Co (OH)3 is calcined to remove water, and the resulting oxide From the3 On4 are reduced by hydrogen or carbon.
|Atomic (molar) mass, g/mol||58,93|
|Oxidation||3, 2, 0, -1|
|The melting temperature t°C||1494°C|
|The heat of fusion kJ/mol||15,48|
|The thermal conductivity K [W/(m·K)]||100|
|Heat of evaporation kJ/mol||389,1|
Industrial chemistry, electrical engineering, instrumentation, manufacture of magnets, transformers and power generators with high efficiency.
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