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Chromium Metal: Chromic Oxide Reduced by Aluminium (Thermit)
Aluminium takes the oxygen from chromic oxide with so much heat that the chromium comes out molten. Thorpe (1912-13) gives Goldschmidt's thermit: chromic oxide mixed with aluminium powder in a magnesia-lined crucible, lit through a fuse of aluminium powder and barium peroxide with a magnesium ribbon. The heat carries the reaction through the whole charge, and carbon-free chromium sinks under a slag of alumina. White heat: outdoors on dry sand, face shield, stand well back.
The picture: chromium metal (Wikimedia Commons).
Abantado
1 day
Mga Tagubilin
1
1
Line the crucible
Line the crucible
Line a refractory crucible with a paste of magnesia and water glass, and let it dry fully.
Mga kailangang kasangkapan:
Krisol na Luwad na Matibay sa Apoy
Oksido ng magnesiyo
Water glass (sodium silicate na solusyon)2
2
Mix the charge
Mix the charge
Weigh 150 g of dry chromic oxide and 50 g of aluminium powder, a little less than the 53 g the equation needs, and mix them intimately.
Mga materyales para sa hakbang na ito:
Kromikong Oksido150 g
Pulbos na Aluminyo50 gMga kailangang kasangkapan:
Timbangang panimbang
Almires at Panghalo3
3
Set the fuse
Set the fuse
Stand the crucible on dry sand outdoors and fill in the charge. On top put a small heap of aluminium powder mixed with barium peroxide, and push a strip of magnesium ribbon into it.
Mga materyales para sa hakbang na ito:
Pulbos na Aluminyo1 piraso
Barium peroxide1 piraso
Laso ng Magnesyo1 pirasoMga kailangang kasangkapan:
Balde ng tuyong buhangin4
4
Light it and stand back
Light it and stand back
Face shield on. Light the end of the ribbon and step well back. The fuse fires the charge and the reaction runs through it by its own heat.
Mga kailangang kasangkapan:
Lighter
Panangga sa Mukha
Gwantes na Katad5
5
Break out the regulus
Break out the regulus
Let it cool completely. Break away the alumina slag on top and take out the button of chromium from the bottom. At most 103 g can form from 150 g of oxide.
Mga kailangang kasangkapan:
MartilyoGwantes na KatadPanangga sa Mukha
Garapong Salamin na May TakipMga Materyales
4- 150 gPlaceholder
- 1 pirasoPlaceholder
- 1 pirasoPlaceholder
- 1 pirasoPlaceholder
Mga Kinakailangang Kasangkapan
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