cobalt assignment
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TRANSCRIPT
Robert Coveny Patrick O’Connor Patrick Darcy
Over the centuries Cobalt has been used in an array of different areas.
Ancient civilisations used cobalt in ceramics and glazes for pottery as well as in dyes.
Georgius Agricola, in the 16th Century successfully supplied Cobalt as raffre
Cobalt was used throughout the 1800’s as a blue pigment in glassware
Cobalt was first isolated by Swedish chemist Georg Brant in 1735.
As cobalt has strong magnetic properties, it is commonly used in high powered magnets and also in medical equipment such as MRI imaging machines
Cobalt is also used in broad range of other devices
Uses of Cobalt up until 1998
Cobalt is generally found in ores combined with Arsenic, Oxygen or Sulfur.
Pure Cobalt does not exist in nature Cobalt is normally extracted as a by-
product of refining other ores The ore is first roasted to remove slag
material, leaving a mixture of metals and oxides
The compound is reduced through electrolysis and heat
aluminium is added to sulphuric acid to dissolve the iron, cobalt, nickel Lime is used to precipitate the iron, while sodium hypochlorite is used to precipitate cobalt as the hydroxide The cobalt hydroxide is then heated to give the oxide, which is then reduced the metal by heating with charcoal
Cobaltite~ CoAsS
Erythrite~ (Co3(AsO4)2)
Glaucodot~ (Co,Fe)AsS
Skutterudite~ CoAs3
Alnico~ containing iron, nickel, aluminium and cobalt.
• Is used to make magnets that keep their magnetism even at very high temperatures.
• Are found in loudspeakers, microphones, pick-ups
Paper containing Cobalt-Chloride is used in laboratories to detect water
Lithium- Cobalt Oxide is used in batteries Cobalt Oxides are used in paints and glazes
The invention of machines
The discovery of new elements
The development of more effective techniques
development of technology
Brian Knapp, B. P. (2002). Actinium to Fluorine. Unknown: Atlantic Europe Publishing Company Ltd.
Hill, H. C. (2003). The Transition Metals 2. London - Oxford: Heinemann Library.
Unknown. (2005, August Wednesday). Cobalt - Wikipedia. Retrieved March Thursday, 2008, from Wikipedia: http://en.wikipedia.org/wiki/Cobalt
Pope, R. (2003, March 24). Cobalt. Retrieved March unknown, 2008, from Web Elements: http://web1.caryacademy.org/chemistry/ElementWebSites/cobalt/
unknown. (2006, October unknown). unknown. Retrieved 03 unknown, 2008, from Cobalt—Its Recovery,Recycling and Application: http://www.tms.org/pubs/journals/jom/0610/wang-0610.html