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Chromium Metal: Chromic Oxide Reduced by Aluminium (Thermit)
Hi-Res Images of Chemical Elements (Wikimedia Commons) · CC BY 3.0
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18. Ukwakira 2026NO
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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).
Hejuru
1 day

Amabwiriza

1

Line the crucible

Line a refractory crucible with a paste of magnesia and water glass, and let it dry fully.

Ibikoresho bikenewe:

Ikirahure cy'Ibumba Rirwanya UmuriroIkirahure cy'Ibumba Rirwanya Umuriro
Okiside ya magnesiyumuOkiside ya magnesiyumu
Ikirahure cy'amazi (umuti wa silikate ya sodiyumu)Ikirahure cy'amazi (umuti wa silikate ya sodiyumu)
2

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.

Ibikoresho by'iyi ntambwe:

Okiside ya KromuOkiside ya Kromu150 g
Ifu ya AluminiyumuIfu ya Aluminiyumu50 g

Ibikoresho bikenewe:

Umunzani w'ibiroUmunzani w'ibiro
Isekuru n'UmuhiniIsekuru n'Umuhini
3

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.

Ibikoresho by'iyi ntambwe:

Ifu ya AluminiyumuIfu ya Aluminiyumu1 igice
Perokside ya bariyumuPerokside ya bariyumu1 igice
Agatambaro ka MagineziyumuAgatambaro ka Magineziyumu1 igice

Ibikoresho bikenewe:

Indobo y'umucanga wumyeIndobo y'umucanga wumye
4

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.

Ibikoresho bikenewe:

IterankubaIterankuba
Ingabo y'IsuraIngabo y'Isura
Uturindantoki tw'UruhuUturindantoki tw'Uruhu
5

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.

Ibikoresho bikenewe:

InyundoInyundo
Uturindantoki tw'UruhuUturindantoki tw'Uruhu
Ingabo y'IsuraIngabo y'Isura
Icupa ry'Ikirahure Rifite UmufunikoIcupa ry'Ikirahure Rifite Umufuniko

Ibikoresho

4

Ibikoresho bikenewe

11

Iki gishushanyo gikora

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Icyuma cya Kromiyumu

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