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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).
Juu
1 day
Maagizo
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.
Zana zinazohitajika:
Kaure ya Udongo Mgumu wa Moto
Oksidi ya magnesiamu
Glasi ya maji (myeyusho wa silikati ya sodiamu)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.
Vifaa kwa hatua hii:
Oksidi ya Kromi150 g
Unga wa Alumini50 gZana zinazohitajika:
Mizani ya mizani-mbili
Kinu na mchi3
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.
Vifaa kwa hatua hii:
Unga wa Alumini1 kipande
Peroksidi ya bariamu1 kipande
Utepe wa Magnesiamu1 kipandeZana zinazohitajika:
Ndoo ya mchanga mkavu4
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.
Zana zinazohitajika:
Kiwasha moto
Ngao ya Uso
Glavu za Ngozi5
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.
Zana zinazohitajika:
NyundoGlavu za NgoziNgao ya Uso
Mitungi ya kioo yenye vifunikoVifaa
4- 150 gKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
Zana Zinazohitajika
11- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
- Kishikilia Nafasi
Mchoro huu unatengeneza
CC0 Umma Wote
Mchoro huu umetolewa chini ya CC0. Uko huru kunakili, kubadilisha, kusambaza, na kutumia kazi hii kwa madhumuni yoyote, bila kuomba ruhusa.
Saidia Mtengenezaji kwa kununua bidhaa kupitia Mchoro wao ambapo wanapata Kamisheni ya Mtengenezaji iliyowekwa na Wachuuzi, au unda marudio mapya ya Mchoro huu na uiunganishe kama kiungo katika Mchoro wako kuchangia mapato.