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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).
Ilọsíwájú
1 day
Ìlànà
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.
Àwọn irinṣẹ́ tí a nílò:
Ìkòkò Amọ̀ Tí Ń Kojú Iná
Ọ́sáídì magnesium
Gíláàsì omi (omi sodium silicate)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.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Òkísídì Kírómù150 g
Èérú Álúmínọ́ọ̀mù50 gÀwọn irinṣẹ́ tí a nílò:
Òǹwọ̀n ìdọ́gba
Odó àti Ọmọ Odó3
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.
Àwọn ohun èlò fún ìgbésẹ̀ yìí:
Èérú Álúmínọ́ọ̀mù1 ẹyọ
Barium peroxide1 ẹyọ
Ọ̀já Magnẹ́síọ́mù1 ẹyọÀwọn irinṣẹ́ tí a nílò:
Garawa yanrìn gbígbẹ4
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.
Àwọn irinṣẹ́ tí a nílò:
Ẹ̀rọ ìtanná
Ààbò Ojú Gbogbo
Ìbọ̀wọ́ Awọ5
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.
Àwọn irinṣẹ́ tí a nílò:
ÒòlùÌbọ̀wọ́ AwọÀàbò Ojú Gbogbo
Ìgò Gílásì OnídìíÀwọn ohun-èlò
4- 150 gÀyè
- 1 ẹyọÀyè
- 1 ẹyọÀyè
- 1 ẹyọÀyè
Àwọn irinṣẹ́ tó nílò
11- Àyè
- Àyè
- Àyè
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